Code
P1112
ALFA ROMEO
P — Powertrain
Fuel pressure control fault
Views:
UK: 6
EN: 13
RU: 9
AI status
Completed
Completed
100%
Causes
- Faulty fuel rail pressure sensor (failed or out-of-spec)
- Faulty fuel pressure regulator / control valve or its control solenoid
- Weak or failing fuel pump (low supply or low return flow)
- Clogged fuel filter, strainer or restricted fuel lines/return
- Damaged or corroded wiring, poor connector or open/short to sensor or control solenoid
- PCM/ECM software or internal fault (less common)
Symptoms
- MIL (Check Engine) illuminated
- Hard starting, extended cranking or no-start
- Rough idle or stalling
- Loss of power, hesitation or poor acceleration
- Reduced fuel economy
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze frame data and all stored codes with a capable scan tool.
- Inspect wiring and connectors at the fuel pressure sensor and regulator/solenoid for corrosion, damage or loose pins.
- Check live data: commanded fuel pressure vs actual fuel rail pressure, sensor voltage, and control solenoid duty cycle.
- Visually inspect fuel lines, filter, strainer and fittings for restrictions or leaks.
- Measure fuel rail pressure with a calibrated mechanical/electronic gauge under various engine loads and compare to commanded values.
- Test resistance and supply voltage to the fuel pressure sensor and regulator/solenoid per manufacturer specs.
Signal parameters
- Fuel rail pressure sensor voltage typically 0.5–4.5 V (varies by sensor); reacts proportionally to rail pressure.
- ECM commanded fuel pressure value vs actual rail pressure (scan tool live data) — actual should follow commanded within tolerance under steady-state and transient conditions.
- Fuel pressure regulator/solenoid control signal: PWM duty cycle or pulse frequency 0–100% depending on command.
- Fuel rail pressure ranges: low-idle, cruise and wide-open conditions should show increasing pressure when commanded; significant deviations indicate a problem.
- Sensor resistance/impedance should match factory specification (consult service manual).
Diagnostic algorithm
- Connect a diagnostic scan tool and record freeze frame/live data: note commanded pressure, actual rail pressure, sensor voltage and solenoid duty cycle. Confirm DTC P1112 is current.
- Visually inspect harnesses and connectors for corrosion, bent pins, damaged insulation or poor grounds at the fuel pressure sensor, regulator/solenoid and ECM.
- With key ON (engine off), backprobe sensor connector and verify reference voltage, ground and signal voltage ranges. Compare to spec.
- Start engine (if safe) and observe live data while varying engine speed/load. Verify whether actual pressure follows commanded changes. If actual is fixed or out of range, continue.
- Attach a certified fuel pressure gauge to the rail and measure static and dynamic pressure under specified conditions (idle, rev, load). Compare to commanded values and service limits.
- Test the fuel pressure regulator/control solenoid: verify PWM/duty cycle from ECM, then apply a known PWM or direct power per service procedures to confirm actuator response and rail pressure change.
- Perform fuel pump flow and pressure tests: inspect/replace fuel filter and inlet strainer if flow is low or pressure is unstable.
- Pressure-relief and inspect for external/internal fuel leaks or leaking injectors that may prevent pressure control.
- If wiring and components test OK, consider swapping known-good pressure sensor or regulator (where practical) before ECM replacement. Recheck for codes and correct operation.
- Clear codes and road-test to verify P1112 does not return. If intermittent, monitor long enough to reproduce.
Likely causes
- Fuel pressure sensor giving incorrect voltage or intermittent signal
- Fuel pressure regulator/control solenoid stuck or not modulating
- Low fuel pump output or failing pump motor
- Clogged fuel filter or restricted return line reducing flow
- Connector corrosion or damaged harness at sensor or solenoid
Fault status
Status
P1112 — Fuel pressure control fault. ECM detected fuel rail pressure not matching commanded control parameters or sensor/actuator response outside limits. MIL set; freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
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Code
P1112
BMW
P — Powertrain
Engine Coolant Temperature Radiator Outlet Sensor High Input
Views:
UK: 24
EN: 41
RU: 42
AI status
Completed
Completed
100%
Causes
- Faulty fuel rail pressure sensor (failed or out-of-spec)
- Faulty fuel pressure regulator / control valve or its control solenoid
- Weak or failing fuel pump (low supply or low return flow)
- Clogged fuel filter, strainer or restricted fuel lines/return
- Damaged or corroded wiring, poor connector or open/short to sensor or control solenoid
- PCM/ECM software or internal fault (less common)
Symptoms
- MIL (Check Engine) illuminated
- Hard starting, extended cranking or no-start
- Rough idle or stalling
- Loss of power, hesitation or poor acceleration
- Reduced fuel economy
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze frame data and all stored codes with a capable scan tool.
- Inspect wiring and connectors at the fuel pressure sensor and regulator/solenoid for corrosion, damage or loose pins.
- Check live data: commanded fuel pressure vs actual fuel rail pressure, sensor voltage, and control solenoid duty cycle.
- Visually inspect fuel lines, filter, strainer and fittings for restrictions or leaks.
- Measure fuel rail pressure with a calibrated mechanical/electronic gauge under various engine loads and compare to commanded values.
- Test resistance and supply voltage to the fuel pressure sensor and regulator/solenoid per manufacturer specs.
Signal parameters
- Fuel rail pressure sensor voltage typically 0.5–4.5 V (varies by sensor); reacts proportionally to rail pressure.
- ECM commanded fuel pressure value vs actual rail pressure (scan tool live data) — actual should follow commanded within tolerance under steady-state and transient conditions.
- Fuel pressure regulator/solenoid control signal: PWM duty cycle or pulse frequency 0–100% depending on command.
- Fuel rail pressure ranges: low-idle, cruise and wide-open conditions should show increasing pressure when commanded; significant deviations indicate a problem.
- Sensor resistance/impedance should match factory specification (consult service manual).
Diagnostic algorithm
- Connect a diagnostic scan tool and record freeze frame/live data: note commanded pressure, actual rail pressure, sensor voltage and solenoid duty cycle. Confirm DTC P1112 is current.
- Visually inspect harnesses and connectors for corrosion, bent pins, damaged insulation or poor grounds at the fuel pressure sensor, regulator/solenoid and ECM.
- With key ON (engine off), backprobe sensor connector and verify reference voltage, ground and signal voltage ranges. Compare to spec.
- Start engine (if safe) and observe live data while varying engine speed/load. Verify whether actual pressure follows commanded changes. If actual is fixed or out of range, continue.
- Attach a certified fuel pressure gauge to the rail and measure static and dynamic pressure under specified conditions (idle, rev, load). Compare to commanded values and service limits.
- Test the fuel pressure regulator/control solenoid: verify PWM/duty cycle from ECM, then apply a known PWM or direct power per service procedures to confirm actuator response and rail pressure change.
- Perform fuel pump flow and pressure tests: inspect/replace fuel filter and inlet strainer if flow is low or pressure is unstable.
- Pressure-relief and inspect for external/internal fuel leaks or leaking injectors that may prevent pressure control.
- If wiring and components test OK, consider swapping known-good pressure sensor or regulator (where practical) before ECM replacement. Recheck for codes and correct operation.
- Clear codes and road-test to verify P1112 does not return. If intermittent, monitor long enough to reproduce.
Likely causes
- Fuel pressure sensor giving incorrect voltage or intermittent signal
- Fuel pressure regulator/control solenoid stuck or not modulating
- Low fuel pump output or failing pump motor
- Clogged fuel filter or restricted return line reducing flow
- Connector corrosion or damaged harness at sensor or solenoid
Fault status
Status
P1112 — Fuel pressure control fault. ECM detected fuel rail pressure not matching commanded control parameters or sensor/actuator response outside limits. MIL set; freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
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Code
P1112
BUICK
P — Powertrain
Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage
Views:
UK: 30
EN: 47
RU: 45
AI status
Completed
Completed
100%
Causes
- Faulty fuel rail pressure sensor (failed or out-of-spec)
- Faulty fuel pressure regulator / control valve or its control solenoid
- Weak or failing fuel pump (low supply or low return flow)
- Clogged fuel filter, strainer or restricted fuel lines/return
- Damaged or corroded wiring, poor connector or open/short to sensor or control solenoid
- PCM/ECM software or internal fault (less common)
Symptoms
- MIL (Check Engine) illuminated
- Hard starting, extended cranking or no-start
- Rough idle or stalling
- Loss of power, hesitation or poor acceleration
- Reduced fuel economy
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze frame data and all stored codes with a capable scan tool.
- Inspect wiring and connectors at the fuel pressure sensor and regulator/solenoid for corrosion, damage or loose pins.
- Check live data: commanded fuel pressure vs actual fuel rail pressure, sensor voltage, and control solenoid duty cycle.
- Visually inspect fuel lines, filter, strainer and fittings for restrictions or leaks.
- Measure fuel rail pressure with a calibrated mechanical/electronic gauge under various engine loads and compare to commanded values.
- Test resistance and supply voltage to the fuel pressure sensor and regulator/solenoid per manufacturer specs.
Signal parameters
- Fuel rail pressure sensor voltage typically 0.5–4.5 V (varies by sensor); reacts proportionally to rail pressure.
- ECM commanded fuel pressure value vs actual rail pressure (scan tool live data) — actual should follow commanded within tolerance under steady-state and transient conditions.
- Fuel pressure regulator/solenoid control signal: PWM duty cycle or pulse frequency 0–100% depending on command.
- Fuel rail pressure ranges: low-idle, cruise and wide-open conditions should show increasing pressure when commanded; significant deviations indicate a problem.
- Sensor resistance/impedance should match factory specification (consult service manual).
Diagnostic algorithm
- Connect a diagnostic scan tool and record freeze frame/live data: note commanded pressure, actual rail pressure, sensor voltage and solenoid duty cycle. Confirm DTC P1112 is current.
- Visually inspect harnesses and connectors for corrosion, bent pins, damaged insulation or poor grounds at the fuel pressure sensor, regulator/solenoid and ECM.
- With key ON (engine off), backprobe sensor connector and verify reference voltage, ground and signal voltage ranges. Compare to spec.
- Start engine (if safe) and observe live data while varying engine speed/load. Verify whether actual pressure follows commanded changes. If actual is fixed or out of range, continue.
- Attach a certified fuel pressure gauge to the rail and measure static and dynamic pressure under specified conditions (idle, rev, load). Compare to commanded values and service limits.
- Test the fuel pressure regulator/control solenoid: verify PWM/duty cycle from ECM, then apply a known PWM or direct power per service procedures to confirm actuator response and rail pressure change.
- Perform fuel pump flow and pressure tests: inspect/replace fuel filter and inlet strainer if flow is low or pressure is unstable.
- Pressure-relief and inspect for external/internal fuel leaks or leaking injectors that may prevent pressure control.
- If wiring and components test OK, consider swapping known-good pressure sensor or regulator (where practical) before ECM replacement. Recheck for codes and correct operation.
- Clear codes and road-test to verify P1112 does not return. If intermittent, monitor long enough to reproduce.
Likely causes
- Fuel pressure sensor giving incorrect voltage or intermittent signal
- Fuel pressure regulator/control solenoid stuck or not modulating
- Low fuel pump output or failing pump motor
- Clogged fuel filter or restricted return line reducing flow
- Connector corrosion or damaged harness at sensor or solenoid
Fault status
Status
P1112 — Fuel pressure control fault. ECM detected fuel rail pressure not matching commanded control parameters or sensor/actuator response outside limits. MIL set; freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
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Code
P1112
CADILLAC
P — Powertrain
Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage
Views:
UK: 25
EN: 39
RU: 42
AI status
Completed
Completed
100%
Causes
- Faulty fuel rail pressure sensor (failed or out-of-spec)
- Faulty fuel pressure regulator / control valve or its control solenoid
- Weak or failing fuel pump (low supply or low return flow)
- Clogged fuel filter, strainer or restricted fuel lines/return
- Damaged or corroded wiring, poor connector or open/short to sensor or control solenoid
- PCM/ECM software or internal fault (less common)
Symptoms
- MIL (Check Engine) illuminated
- Hard starting, extended cranking or no-start
- Rough idle or stalling
- Loss of power, hesitation or poor acceleration
- Reduced fuel economy
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze frame data and all stored codes with a capable scan tool.
- Inspect wiring and connectors at the fuel pressure sensor and regulator/solenoid for corrosion, damage or loose pins.
- Check live data: commanded fuel pressure vs actual fuel rail pressure, sensor voltage, and control solenoid duty cycle.
- Visually inspect fuel lines, filter, strainer and fittings for restrictions or leaks.
- Measure fuel rail pressure with a calibrated mechanical/electronic gauge under various engine loads and compare to commanded values.
- Test resistance and supply voltage to the fuel pressure sensor and regulator/solenoid per manufacturer specs.
Signal parameters
- Fuel rail pressure sensor voltage typically 0.5–4.5 V (varies by sensor); reacts proportionally to rail pressure.
- ECM commanded fuel pressure value vs actual rail pressure (scan tool live data) — actual should follow commanded within tolerance under steady-state and transient conditions.
- Fuel pressure regulator/solenoid control signal: PWM duty cycle or pulse frequency 0–100% depending on command.
- Fuel rail pressure ranges: low-idle, cruise and wide-open conditions should show increasing pressure when commanded; significant deviations indicate a problem.
- Sensor resistance/impedance should match factory specification (consult service manual).
Diagnostic algorithm
- Connect a diagnostic scan tool and record freeze frame/live data: note commanded pressure, actual rail pressure, sensor voltage and solenoid duty cycle. Confirm DTC P1112 is current.
- Visually inspect harnesses and connectors for corrosion, bent pins, damaged insulation or poor grounds at the fuel pressure sensor, regulator/solenoid and ECM.
- With key ON (engine off), backprobe sensor connector and verify reference voltage, ground and signal voltage ranges. Compare to spec.
- Start engine (if safe) and observe live data while varying engine speed/load. Verify whether actual pressure follows commanded changes. If actual is fixed or out of range, continue.
- Attach a certified fuel pressure gauge to the rail and measure static and dynamic pressure under specified conditions (idle, rev, load). Compare to commanded values and service limits.
- Test the fuel pressure regulator/control solenoid: verify PWM/duty cycle from ECM, then apply a known PWM or direct power per service procedures to confirm actuator response and rail pressure change.
- Perform fuel pump flow and pressure tests: inspect/replace fuel filter and inlet strainer if flow is low or pressure is unstable.
- Pressure-relief and inspect for external/internal fuel leaks or leaking injectors that may prevent pressure control.
- If wiring and components test OK, consider swapping known-good pressure sensor or regulator (where practical) before ECM replacement. Recheck for codes and correct operation.
- Clear codes and road-test to verify P1112 does not return. If intermittent, monitor long enough to reproduce.
Likely causes
- Fuel pressure sensor giving incorrect voltage or intermittent signal
- Fuel pressure regulator/control solenoid stuck or not modulating
- Low fuel pump output or failing pump motor
- Clogged fuel filter or restricted return line reducing flow
- Connector corrosion or damaged harness at sensor or solenoid
Fault status
Status
P1112 — Fuel pressure control fault. ECM detected fuel rail pressure not matching commanded control parameters or sensor/actuator response outside limits. MIL set; freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
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Was this AI description helpful?
Your feedback helps improve AI descriptions.
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Code
P1112
CHEVROLET
P — Powertrain
Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage
Views:
UK: 24
EN: 39
RU: 43
AI status
Completed
Completed
100%
Causes
- Faulty fuel rail pressure sensor (failed or out-of-spec)
- Faulty fuel pressure regulator / control valve or its control solenoid
- Weak or failing fuel pump (low supply or low return flow)
- Clogged fuel filter, strainer or restricted fuel lines/return
- Damaged or corroded wiring, poor connector or open/short to sensor or control solenoid
- PCM/ECM software or internal fault (less common)
Symptoms
- MIL (Check Engine) illuminated
- Hard starting, extended cranking or no-start
- Rough idle or stalling
- Loss of power, hesitation or poor acceleration
- Reduced fuel economy
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze frame data and all stored codes with a capable scan tool.
- Inspect wiring and connectors at the fuel pressure sensor and regulator/solenoid for corrosion, damage or loose pins.
- Check live data: commanded fuel pressure vs actual fuel rail pressure, sensor voltage, and control solenoid duty cycle.
- Visually inspect fuel lines, filter, strainer and fittings for restrictions or leaks.
- Measure fuel rail pressure with a calibrated mechanical/electronic gauge under various engine loads and compare to commanded values.
- Test resistance and supply voltage to the fuel pressure sensor and regulator/solenoid per manufacturer specs.
Signal parameters
- Fuel rail pressure sensor voltage typically 0.5–4.5 V (varies by sensor); reacts proportionally to rail pressure.
- ECM commanded fuel pressure value vs actual rail pressure (scan tool live data) — actual should follow commanded within tolerance under steady-state and transient conditions.
- Fuel pressure regulator/solenoid control signal: PWM duty cycle or pulse frequency 0–100% depending on command.
- Fuel rail pressure ranges: low-idle, cruise and wide-open conditions should show increasing pressure when commanded; significant deviations indicate a problem.
- Sensor resistance/impedance should match factory specification (consult service manual).
Diagnostic algorithm
- Connect a diagnostic scan tool and record freeze frame/live data: note commanded pressure, actual rail pressure, sensor voltage and solenoid duty cycle. Confirm DTC P1112 is current.
- Visually inspect harnesses and connectors for corrosion, bent pins, damaged insulation or poor grounds at the fuel pressure sensor, regulator/solenoid and ECM.
- With key ON (engine off), backprobe sensor connector and verify reference voltage, ground and signal voltage ranges. Compare to spec.
- Start engine (if safe) and observe live data while varying engine speed/load. Verify whether actual pressure follows commanded changes. If actual is fixed or out of range, continue.
- Attach a certified fuel pressure gauge to the rail and measure static and dynamic pressure under specified conditions (idle, rev, load). Compare to commanded values and service limits.
- Test the fuel pressure regulator/control solenoid: verify PWM/duty cycle from ECM, then apply a known PWM or direct power per service procedures to confirm actuator response and rail pressure change.
- Perform fuel pump flow and pressure tests: inspect/replace fuel filter and inlet strainer if flow is low or pressure is unstable.
- Pressure-relief and inspect for external/internal fuel leaks or leaking injectors that may prevent pressure control.
- If wiring and components test OK, consider swapping known-good pressure sensor or regulator (where practical) before ECM replacement. Recheck for codes and correct operation.
- Clear codes and road-test to verify P1112 does not return. If intermittent, monitor long enough to reproduce.
Likely causes
- Fuel pressure sensor giving incorrect voltage or intermittent signal
- Fuel pressure regulator/control solenoid stuck or not modulating
- Low fuel pump output or failing pump motor
- Clogged fuel filter or restricted return line reducing flow
- Connector corrosion or damaged harness at sensor or solenoid
Fault status
Status
P1112 — Fuel pressure control fault. ECM detected fuel rail pressure not matching commanded control parameters or sensor/actuator response outside limits. MIL set; freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
Your experience will help others
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Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
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0
Send to email
Code
P1112
CHRYSLER
P — Powertrain
Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage
Views:
UK: 26
EN: 40
RU: 42
AI status
Completed
Completed
100%
Causes
- Faulty fuel rail pressure sensor (failed or out-of-spec)
- Faulty fuel pressure regulator / control valve or its control solenoid
- Weak or failing fuel pump (low supply or low return flow)
- Clogged fuel filter, strainer or restricted fuel lines/return
- Damaged or corroded wiring, poor connector or open/short to sensor or control solenoid
- PCM/ECM software or internal fault (less common)
Symptoms
- MIL (Check Engine) illuminated
- Hard starting, extended cranking or no-start
- Rough idle or stalling
- Loss of power, hesitation or poor acceleration
- Reduced fuel economy
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze frame data and all stored codes with a capable scan tool.
- Inspect wiring and connectors at the fuel pressure sensor and regulator/solenoid for corrosion, damage or loose pins.
- Check live data: commanded fuel pressure vs actual fuel rail pressure, sensor voltage, and control solenoid duty cycle.
- Visually inspect fuel lines, filter, strainer and fittings for restrictions or leaks.
- Measure fuel rail pressure with a calibrated mechanical/electronic gauge under various engine loads and compare to commanded values.
- Test resistance and supply voltage to the fuel pressure sensor and regulator/solenoid per manufacturer specs.
Signal parameters
- Fuel rail pressure sensor voltage typically 0.5–4.5 V (varies by sensor); reacts proportionally to rail pressure.
- ECM commanded fuel pressure value vs actual rail pressure (scan tool live data) — actual should follow commanded within tolerance under steady-state and transient conditions.
- Fuel pressure regulator/solenoid control signal: PWM duty cycle or pulse frequency 0–100% depending on command.
- Fuel rail pressure ranges: low-idle, cruise and wide-open conditions should show increasing pressure when commanded; significant deviations indicate a problem.
- Sensor resistance/impedance should match factory specification (consult service manual).
Diagnostic algorithm
- Connect a diagnostic scan tool and record freeze frame/live data: note commanded pressure, actual rail pressure, sensor voltage and solenoid duty cycle. Confirm DTC P1112 is current.
- Visually inspect harnesses and connectors for corrosion, bent pins, damaged insulation or poor grounds at the fuel pressure sensor, regulator/solenoid and ECM.
- With key ON (engine off), backprobe sensor connector and verify reference voltage, ground and signal voltage ranges. Compare to spec.
- Start engine (if safe) and observe live data while varying engine speed/load. Verify whether actual pressure follows commanded changes. If actual is fixed or out of range, continue.
- Attach a certified fuel pressure gauge to the rail and measure static and dynamic pressure under specified conditions (idle, rev, load). Compare to commanded values and service limits.
- Test the fuel pressure regulator/control solenoid: verify PWM/duty cycle from ECM, then apply a known PWM or direct power per service procedures to confirm actuator response and rail pressure change.
- Perform fuel pump flow and pressure tests: inspect/replace fuel filter and inlet strainer if flow is low or pressure is unstable.
- Pressure-relief and inspect for external/internal fuel leaks or leaking injectors that may prevent pressure control.
- If wiring and components test OK, consider swapping known-good pressure sensor or regulator (where practical) before ECM replacement. Recheck for codes and correct operation.
- Clear codes and road-test to verify P1112 does not return. If intermittent, monitor long enough to reproduce.
Likely causes
- Fuel pressure sensor giving incorrect voltage or intermittent signal
- Fuel pressure regulator/control solenoid stuck or not modulating
- Low fuel pump output or failing pump motor
- Clogged fuel filter or restricted return line reducing flow
- Connector corrosion or damaged harness at sensor or solenoid
Fault status
Status
P1112 — Fuel pressure control fault. ECM detected fuel rail pressure not matching commanded control parameters or sensor/actuator response outside limits. MIL set; freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
Your experience will help others
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Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
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0
Send to email
Code
P1112
DAEWOO
P — Powertrain
MAP SENSOR
Views:
UK: 6
EN: 13
RU: 8
AI status
Completed
Completed
100%
Causes
- Faulty fuel rail pressure sensor (failed or out-of-spec)
- Faulty fuel pressure regulator / control valve or its control solenoid
- Weak or failing fuel pump (low supply or low return flow)
- Clogged fuel filter, strainer or restricted fuel lines/return
- Damaged or corroded wiring, poor connector or open/short to sensor or control solenoid
- PCM/ECM software or internal fault (less common)
Symptoms
- MIL (Check Engine) illuminated
- Hard starting, extended cranking or no-start
- Rough idle or stalling
- Loss of power, hesitation or poor acceleration
- Reduced fuel economy
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze frame data and all stored codes with a capable scan tool.
- Inspect wiring and connectors at the fuel pressure sensor and regulator/solenoid for corrosion, damage or loose pins.
- Check live data: commanded fuel pressure vs actual fuel rail pressure, sensor voltage, and control solenoid duty cycle.
- Visually inspect fuel lines, filter, strainer and fittings for restrictions or leaks.
- Measure fuel rail pressure with a calibrated mechanical/electronic gauge under various engine loads and compare to commanded values.
- Test resistance and supply voltage to the fuel pressure sensor and regulator/solenoid per manufacturer specs.
Signal parameters
- Fuel rail pressure sensor voltage typically 0.5–4.5 V (varies by sensor); reacts proportionally to rail pressure.
- ECM commanded fuel pressure value vs actual rail pressure (scan tool live data) — actual should follow commanded within tolerance under steady-state and transient conditions.
- Fuel pressure regulator/solenoid control signal: PWM duty cycle or pulse frequency 0–100% depending on command.
- Fuel rail pressure ranges: low-idle, cruise and wide-open conditions should show increasing pressure when commanded; significant deviations indicate a problem.
- Sensor resistance/impedance should match factory specification (consult service manual).
Diagnostic algorithm
- Connect a diagnostic scan tool and record freeze frame/live data: note commanded pressure, actual rail pressure, sensor voltage and solenoid duty cycle. Confirm DTC P1112 is current.
- Visually inspect harnesses and connectors for corrosion, bent pins, damaged insulation or poor grounds at the fuel pressure sensor, regulator/solenoid and ECM.
- With key ON (engine off), backprobe sensor connector and verify reference voltage, ground and signal voltage ranges. Compare to spec.
- Start engine (if safe) and observe live data while varying engine speed/load. Verify whether actual pressure follows commanded changes. If actual is fixed or out of range, continue.
- Attach a certified fuel pressure gauge to the rail and measure static and dynamic pressure under specified conditions (idle, rev, load). Compare to commanded values and service limits.
- Test the fuel pressure regulator/control solenoid: verify PWM/duty cycle from ECM, then apply a known PWM or direct power per service procedures to confirm actuator response and rail pressure change.
- Perform fuel pump flow and pressure tests: inspect/replace fuel filter and inlet strainer if flow is low or pressure is unstable.
- Pressure-relief and inspect for external/internal fuel leaks or leaking injectors that may prevent pressure control.
- If wiring and components test OK, consider swapping known-good pressure sensor or regulator (where practical) before ECM replacement. Recheck for codes and correct operation.
- Clear codes and road-test to verify P1112 does not return. If intermittent, monitor long enough to reproduce.
Likely causes
- Fuel pressure sensor giving incorrect voltage or intermittent signal
- Fuel pressure regulator/control solenoid stuck or not modulating
- Low fuel pump output or failing pump motor
- Clogged fuel filter or restricted return line reducing flow
- Connector corrosion or damaged harness at sensor or solenoid
Fault status
Status
P1112 — Fuel pressure control fault. ECM detected fuel rail pressure not matching commanded control parameters or sensor/actuator response outside limits. MIL set; freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P1112
FIAT
P — Powertrain
Fuel pressure control fault
Views:
UK: 6
EN: 13
RU: 9
AI status
Completed
Completed
100%
Causes
- Faulty fuel rail pressure sensor (failed or out-of-spec)
- Faulty fuel pressure regulator / control valve or its control solenoid
- Weak or failing fuel pump (low supply or low return flow)
- Clogged fuel filter, strainer or restricted fuel lines/return
- Damaged or corroded wiring, poor connector or open/short to sensor or control solenoid
- PCM/ECM software or internal fault (less common)
Symptoms
- MIL (Check Engine) illuminated
- Hard starting, extended cranking or no-start
- Rough idle or stalling
- Loss of power, hesitation or poor acceleration
- Reduced fuel economy
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze frame data and all stored codes with a capable scan tool.
- Inspect wiring and connectors at the fuel pressure sensor and regulator/solenoid for corrosion, damage or loose pins.
- Check live data: commanded fuel pressure vs actual fuel rail pressure, sensor voltage, and control solenoid duty cycle.
- Visually inspect fuel lines, filter, strainer and fittings for restrictions or leaks.
- Measure fuel rail pressure with a calibrated mechanical/electronic gauge under various engine loads and compare to commanded values.
- Test resistance and supply voltage to the fuel pressure sensor and regulator/solenoid per manufacturer specs.
Signal parameters
- Fuel rail pressure sensor voltage typically 0.5–4.5 V (varies by sensor); reacts proportionally to rail pressure.
- ECM commanded fuel pressure value vs actual rail pressure (scan tool live data) — actual should follow commanded within tolerance under steady-state and transient conditions.
- Fuel pressure regulator/solenoid control signal: PWM duty cycle or pulse frequency 0–100% depending on command.
- Fuel rail pressure ranges: low-idle, cruise and wide-open conditions should show increasing pressure when commanded; significant deviations indicate a problem.
- Sensor resistance/impedance should match factory specification (consult service manual).
Diagnostic algorithm
- Connect a diagnostic scan tool and record freeze frame/live data: note commanded pressure, actual rail pressure, sensor voltage and solenoid duty cycle. Confirm DTC P1112 is current.
- Visually inspect harnesses and connectors for corrosion, bent pins, damaged insulation or poor grounds at the fuel pressure sensor, regulator/solenoid and ECM.
- With key ON (engine off), backprobe sensor connector and verify reference voltage, ground and signal voltage ranges. Compare to spec.
- Start engine (if safe) and observe live data while varying engine speed/load. Verify whether actual pressure follows commanded changes. If actual is fixed or out of range, continue.
- Attach a certified fuel pressure gauge to the rail and measure static and dynamic pressure under specified conditions (idle, rev, load). Compare to commanded values and service limits.
- Test the fuel pressure regulator/control solenoid: verify PWM/duty cycle from ECM, then apply a known PWM or direct power per service procedures to confirm actuator response and rail pressure change.
- Perform fuel pump flow and pressure tests: inspect/replace fuel filter and inlet strainer if flow is low or pressure is unstable.
- Pressure-relief and inspect for external/internal fuel leaks or leaking injectors that may prevent pressure control.
- If wiring and components test OK, consider swapping known-good pressure sensor or regulator (where practical) before ECM replacement. Recheck for codes and correct operation.
- Clear codes and road-test to verify P1112 does not return. If intermittent, monitor long enough to reproduce.
Likely causes
- Fuel pressure sensor giving incorrect voltage or intermittent signal
- Fuel pressure regulator/control solenoid stuck or not modulating
- Low fuel pump output or failing pump motor
- Clogged fuel filter or restricted return line reducing flow
- Connector corrosion or damaged harness at sensor or solenoid
Fault status
Status
P1112 — Fuel pressure control fault. ECM detected fuel rail pressure not matching commanded control parameters or sensor/actuator response outside limits. MIL set; freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
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Code
P1112
FORD
P — Powertrain
Intake Air Temperature Sensor Intermittent
Views:
UK: 26
EN: 50
RU: 43
AI status
Completed
Completed
100%
Causes
- Faulty fuel rail pressure sensor (failed or out-of-spec)
- Faulty fuel pressure regulator / control valve or its control solenoid
- Weak or failing fuel pump (low supply or low return flow)
- Clogged fuel filter, strainer or restricted fuel lines/return
- Damaged or corroded wiring, poor connector or open/short to sensor or control solenoid
- PCM/ECM software or internal fault (less common)
Symptoms
- MIL (Check Engine) illuminated
- Hard starting, extended cranking or no-start
- Rough idle or stalling
- Loss of power, hesitation or poor acceleration
- Reduced fuel economy
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze frame data and all stored codes with a capable scan tool.
- Inspect wiring and connectors at the fuel pressure sensor and regulator/solenoid for corrosion, damage or loose pins.
- Check live data: commanded fuel pressure vs actual fuel rail pressure, sensor voltage, and control solenoid duty cycle.
- Visually inspect fuel lines, filter, strainer and fittings for restrictions or leaks.
- Measure fuel rail pressure with a calibrated mechanical/electronic gauge under various engine loads and compare to commanded values.
- Test resistance and supply voltage to the fuel pressure sensor and regulator/solenoid per manufacturer specs.
Signal parameters
- Fuel rail pressure sensor voltage typically 0.5–4.5 V (varies by sensor); reacts proportionally to rail pressure.
- ECM commanded fuel pressure value vs actual rail pressure (scan tool live data) — actual should follow commanded within tolerance under steady-state and transient conditions.
- Fuel pressure regulator/solenoid control signal: PWM duty cycle or pulse frequency 0–100% depending on command.
- Fuel rail pressure ranges: low-idle, cruise and wide-open conditions should show increasing pressure when commanded; significant deviations indicate a problem.
- Sensor resistance/impedance should match factory specification (consult service manual).
Diagnostic algorithm
- Connect a diagnostic scan tool and record freeze frame/live data: note commanded pressure, actual rail pressure, sensor voltage and solenoid duty cycle. Confirm DTC P1112 is current.
- Visually inspect harnesses and connectors for corrosion, bent pins, damaged insulation or poor grounds at the fuel pressure sensor, regulator/solenoid and ECM.
- With key ON (engine off), backprobe sensor connector and verify reference voltage, ground and signal voltage ranges. Compare to spec.
- Start engine (if safe) and observe live data while varying engine speed/load. Verify whether actual pressure follows commanded changes. If actual is fixed or out of range, continue.
- Attach a certified fuel pressure gauge to the rail and measure static and dynamic pressure under specified conditions (idle, rev, load). Compare to commanded values and service limits.
- Test the fuel pressure regulator/control solenoid: verify PWM/duty cycle from ECM, then apply a known PWM or direct power per service procedures to confirm actuator response and rail pressure change.
- Perform fuel pump flow and pressure tests: inspect/replace fuel filter and inlet strainer if flow is low or pressure is unstable.
- Pressure-relief and inspect for external/internal fuel leaks or leaking injectors that may prevent pressure control.
- If wiring and components test OK, consider swapping known-good pressure sensor or regulator (where practical) before ECM replacement. Recheck for codes and correct operation.
- Clear codes and road-test to verify P1112 does not return. If intermittent, monitor long enough to reproduce.
Likely causes
- Fuel pressure sensor giving incorrect voltage or intermittent signal
- Fuel pressure regulator/control solenoid stuck or not modulating
- Low fuel pump output or failing pump motor
- Clogged fuel filter or restricted return line reducing flow
- Connector corrosion or damaged harness at sensor or solenoid
Fault status
Status
P1112 — Fuel pressure control fault. ECM detected fuel rail pressure not matching commanded control parameters or sensor/actuator response outside limits. MIL set; freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
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Code
P1112
GM
P — Powertrain
Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage
Views:
UK: 28
EN: 61
RU: 45
AI status
Completed
Completed
100%
Causes
- Faulty fuel rail pressure sensor (failed or out-of-spec)
- Faulty fuel pressure regulator / control valve or its control solenoid
- Weak or failing fuel pump (low supply or low return flow)
- Clogged fuel filter, strainer or restricted fuel lines/return
- Damaged or corroded wiring, poor connector or open/short to sensor or control solenoid
- PCM/ECM software or internal fault (less common)
Symptoms
- MIL (Check Engine) illuminated
- Hard starting, extended cranking or no-start
- Rough idle or stalling
- Loss of power, hesitation or poor acceleration
- Reduced fuel economy
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze frame data and all stored codes with a capable scan tool.
- Inspect wiring and connectors at the fuel pressure sensor and regulator/solenoid for corrosion, damage or loose pins.
- Check live data: commanded fuel pressure vs actual fuel rail pressure, sensor voltage, and control solenoid duty cycle.
- Visually inspect fuel lines, filter, strainer and fittings for restrictions or leaks.
- Measure fuel rail pressure with a calibrated mechanical/electronic gauge under various engine loads and compare to commanded values.
- Test resistance and supply voltage to the fuel pressure sensor and regulator/solenoid per manufacturer specs.
Signal parameters
- Fuel rail pressure sensor voltage typically 0.5–4.5 V (varies by sensor); reacts proportionally to rail pressure.
- ECM commanded fuel pressure value vs actual rail pressure (scan tool live data) — actual should follow commanded within tolerance under steady-state and transient conditions.
- Fuel pressure regulator/solenoid control signal: PWM duty cycle or pulse frequency 0–100% depending on command.
- Fuel rail pressure ranges: low-idle, cruise and wide-open conditions should show increasing pressure when commanded; significant deviations indicate a problem.
- Sensor resistance/impedance should match factory specification (consult service manual).
Diagnostic algorithm
- Connect a diagnostic scan tool and record freeze frame/live data: note commanded pressure, actual rail pressure, sensor voltage and solenoid duty cycle. Confirm DTC P1112 is current.
- Visually inspect harnesses and connectors for corrosion, bent pins, damaged insulation or poor grounds at the fuel pressure sensor, regulator/solenoid and ECM.
- With key ON (engine off), backprobe sensor connector and verify reference voltage, ground and signal voltage ranges. Compare to spec.
- Start engine (if safe) and observe live data while varying engine speed/load. Verify whether actual pressure follows commanded changes. If actual is fixed or out of range, continue.
- Attach a certified fuel pressure gauge to the rail and measure static and dynamic pressure under specified conditions (idle, rev, load). Compare to commanded values and service limits.
- Test the fuel pressure regulator/control solenoid: verify PWM/duty cycle from ECM, then apply a known PWM or direct power per service procedures to confirm actuator response and rail pressure change.
- Perform fuel pump flow and pressure tests: inspect/replace fuel filter and inlet strainer if flow is low or pressure is unstable.
- Pressure-relief and inspect for external/internal fuel leaks or leaking injectors that may prevent pressure control.
- If wiring and components test OK, consider swapping known-good pressure sensor or regulator (where practical) before ECM replacement. Recheck for codes and correct operation.
- Clear codes and road-test to verify P1112 does not return. If intermittent, monitor long enough to reproduce.
Likely causes
- Fuel pressure sensor giving incorrect voltage or intermittent signal
- Fuel pressure regulator/control solenoid stuck or not modulating
- Low fuel pump output or failing pump motor
- Clogged fuel filter or restricted return line reducing flow
- Connector corrosion or damaged harness at sensor or solenoid
Fault status
Status
P1112 — Fuel pressure control fault. ECM detected fuel rail pressure not matching commanded control parameters or sensor/actuator response outside limits. MIL set; freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
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Code
P1112
GMC
P — Powertrain
Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage
Views:
UK: 30
EN: 50
RU: 52
AI status
Completed
Completed
100%
Causes
- Faulty fuel rail pressure sensor (failed or out-of-spec)
- Faulty fuel pressure regulator / control valve or its control solenoid
- Weak or failing fuel pump (low supply or low return flow)
- Clogged fuel filter, strainer or restricted fuel lines/return
- Damaged or corroded wiring, poor connector or open/short to sensor or control solenoid
- PCM/ECM software or internal fault (less common)
Symptoms
- MIL (Check Engine) illuminated
- Hard starting, extended cranking or no-start
- Rough idle or stalling
- Loss of power, hesitation or poor acceleration
- Reduced fuel economy
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze frame data and all stored codes with a capable scan tool.
- Inspect wiring and connectors at the fuel pressure sensor and regulator/solenoid for corrosion, damage or loose pins.
- Check live data: commanded fuel pressure vs actual fuel rail pressure, sensor voltage, and control solenoid duty cycle.
- Visually inspect fuel lines, filter, strainer and fittings for restrictions or leaks.
- Measure fuel rail pressure with a calibrated mechanical/electronic gauge under various engine loads and compare to commanded values.
- Test resistance and supply voltage to the fuel pressure sensor and regulator/solenoid per manufacturer specs.
Signal parameters
- Fuel rail pressure sensor voltage typically 0.5–4.5 V (varies by sensor); reacts proportionally to rail pressure.
- ECM commanded fuel pressure value vs actual rail pressure (scan tool live data) — actual should follow commanded within tolerance under steady-state and transient conditions.
- Fuel pressure regulator/solenoid control signal: PWM duty cycle or pulse frequency 0–100% depending on command.
- Fuel rail pressure ranges: low-idle, cruise and wide-open conditions should show increasing pressure when commanded; significant deviations indicate a problem.
- Sensor resistance/impedance should match factory specification (consult service manual).
Diagnostic algorithm
- Connect a diagnostic scan tool and record freeze frame/live data: note commanded pressure, actual rail pressure, sensor voltage and solenoid duty cycle. Confirm DTC P1112 is current.
- Visually inspect harnesses and connectors for corrosion, bent pins, damaged insulation or poor grounds at the fuel pressure sensor, regulator/solenoid and ECM.
- With key ON (engine off), backprobe sensor connector and verify reference voltage, ground and signal voltage ranges. Compare to spec.
- Start engine (if safe) and observe live data while varying engine speed/load. Verify whether actual pressure follows commanded changes. If actual is fixed or out of range, continue.
- Attach a certified fuel pressure gauge to the rail and measure static and dynamic pressure under specified conditions (idle, rev, load). Compare to commanded values and service limits.
- Test the fuel pressure regulator/control solenoid: verify PWM/duty cycle from ECM, then apply a known PWM or direct power per service procedures to confirm actuator response and rail pressure change.
- Perform fuel pump flow and pressure tests: inspect/replace fuel filter and inlet strainer if flow is low or pressure is unstable.
- Pressure-relief and inspect for external/internal fuel leaks or leaking injectors that may prevent pressure control.
- If wiring and components test OK, consider swapping known-good pressure sensor or regulator (where practical) before ECM replacement. Recheck for codes and correct operation.
- Clear codes and road-test to verify P1112 does not return. If intermittent, monitor long enough to reproduce.
Likely causes
- Fuel pressure sensor giving incorrect voltage or intermittent signal
- Fuel pressure regulator/control solenoid stuck or not modulating
- Low fuel pump output or failing pump motor
- Clogged fuel filter or restricted return line reducing flow
- Connector corrosion or damaged harness at sensor or solenoid
Fault status
Status
P1112 — Fuel pressure control fault. ECM detected fuel rail pressure not matching commanded control parameters or sensor/actuator response outside limits. MIL set; freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
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Code
P1112
GWM
P — Powertrain
- Inlet Air Temperature Sensor Circuit Low Voltage (IAT)
Views:
UK: 3
EN: 10
RU: 6
AI status
Completed
Completed
100%
Causes
- Faulty fuel rail pressure sensor (failed or out-of-spec)
- Faulty fuel pressure regulator / control valve or its control solenoid
- Weak or failing fuel pump (low supply or low return flow)
- Clogged fuel filter, strainer or restricted fuel lines/return
- Damaged or corroded wiring, poor connector or open/short to sensor or control solenoid
- PCM/ECM software or internal fault (less common)
Symptoms
- MIL (Check Engine) illuminated
- Hard starting, extended cranking or no-start
- Rough idle or stalling
- Loss of power, hesitation or poor acceleration
- Reduced fuel economy
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze frame data and all stored codes with a capable scan tool.
- Inspect wiring and connectors at the fuel pressure sensor and regulator/solenoid for corrosion, damage or loose pins.
- Check live data: commanded fuel pressure vs actual fuel rail pressure, sensor voltage, and control solenoid duty cycle.
- Visually inspect fuel lines, filter, strainer and fittings for restrictions or leaks.
- Measure fuel rail pressure with a calibrated mechanical/electronic gauge under various engine loads and compare to commanded values.
- Test resistance and supply voltage to the fuel pressure sensor and regulator/solenoid per manufacturer specs.
Signal parameters
- Fuel rail pressure sensor voltage typically 0.5–4.5 V (varies by sensor); reacts proportionally to rail pressure.
- ECM commanded fuel pressure value vs actual rail pressure (scan tool live data) — actual should follow commanded within tolerance under steady-state and transient conditions.
- Fuel pressure regulator/solenoid control signal: PWM duty cycle or pulse frequency 0–100% depending on command.
- Fuel rail pressure ranges: low-idle, cruise and wide-open conditions should show increasing pressure when commanded; significant deviations indicate a problem.
- Sensor resistance/impedance should match factory specification (consult service manual).
Diagnostic algorithm
- Connect a diagnostic scan tool and record freeze frame/live data: note commanded pressure, actual rail pressure, sensor voltage and solenoid duty cycle. Confirm DTC P1112 is current.
- Visually inspect harnesses and connectors for corrosion, bent pins, damaged insulation or poor grounds at the fuel pressure sensor, regulator/solenoid and ECM.
- With key ON (engine off), backprobe sensor connector and verify reference voltage, ground and signal voltage ranges. Compare to spec.
- Start engine (if safe) and observe live data while varying engine speed/load. Verify whether actual pressure follows commanded changes. If actual is fixed or out of range, continue.
- Attach a certified fuel pressure gauge to the rail and measure static and dynamic pressure under specified conditions (idle, rev, load). Compare to commanded values and service limits.
- Test the fuel pressure regulator/control solenoid: verify PWM/duty cycle from ECM, then apply a known PWM or direct power per service procedures to confirm actuator response and rail pressure change.
- Perform fuel pump flow and pressure tests: inspect/replace fuel filter and inlet strainer if flow is low or pressure is unstable.
- Pressure-relief and inspect for external/internal fuel leaks or leaking injectors that may prevent pressure control.
- If wiring and components test OK, consider swapping known-good pressure sensor or regulator (where practical) before ECM replacement. Recheck for codes and correct operation.
- Clear codes and road-test to verify P1112 does not return. If intermittent, monitor long enough to reproduce.
Likely causes
- Fuel pressure sensor giving incorrect voltage or intermittent signal
- Fuel pressure regulator/control solenoid stuck or not modulating
- Low fuel pump output or failing pump motor
- Clogged fuel filter or restricted return line reducing flow
- Connector corrosion or damaged harness at sensor or solenoid
Fault status
Status
P1112 — Fuel pressure control fault. ECM detected fuel rail pressure not matching commanded control parameters or sensor/actuator response outside limits. MIL set; freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
Your experience will help others
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Was this AI description helpful?
Your feedback helps improve AI descriptions.
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Code
P1112
HUMMER
P — Powertrain
Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage
Views:
UK: 14
EN: 21
RU: 21
AI status
Completed
Completed
100%
Causes
- Faulty fuel rail pressure sensor (failed or out-of-spec)
- Faulty fuel pressure regulator / control valve or its control solenoid
- Weak or failing fuel pump (low supply or low return flow)
- Clogged fuel filter, strainer or restricted fuel lines/return
- Damaged or corroded wiring, poor connector or open/short to sensor or control solenoid
- PCM/ECM software or internal fault (less common)
Symptoms
- MIL (Check Engine) illuminated
- Hard starting, extended cranking or no-start
- Rough idle or stalling
- Loss of power, hesitation or poor acceleration
- Reduced fuel economy
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze frame data and all stored codes with a capable scan tool.
- Inspect wiring and connectors at the fuel pressure sensor and regulator/solenoid for corrosion, damage or loose pins.
- Check live data: commanded fuel pressure vs actual fuel rail pressure, sensor voltage, and control solenoid duty cycle.
- Visually inspect fuel lines, filter, strainer and fittings for restrictions or leaks.
- Measure fuel rail pressure with a calibrated mechanical/electronic gauge under various engine loads and compare to commanded values.
- Test resistance and supply voltage to the fuel pressure sensor and regulator/solenoid per manufacturer specs.
Signal parameters
- Fuel rail pressure sensor voltage typically 0.5–4.5 V (varies by sensor); reacts proportionally to rail pressure.
- ECM commanded fuel pressure value vs actual rail pressure (scan tool live data) — actual should follow commanded within tolerance under steady-state and transient conditions.
- Fuel pressure regulator/solenoid control signal: PWM duty cycle or pulse frequency 0–100% depending on command.
- Fuel rail pressure ranges: low-idle, cruise and wide-open conditions should show increasing pressure when commanded; significant deviations indicate a problem.
- Sensor resistance/impedance should match factory specification (consult service manual).
Diagnostic algorithm
- Connect a diagnostic scan tool and record freeze frame/live data: note commanded pressure, actual rail pressure, sensor voltage and solenoid duty cycle. Confirm DTC P1112 is current.
- Visually inspect harnesses and connectors for corrosion, bent pins, damaged insulation or poor grounds at the fuel pressure sensor, regulator/solenoid and ECM.
- With key ON (engine off), backprobe sensor connector and verify reference voltage, ground and signal voltage ranges. Compare to spec.
- Start engine (if safe) and observe live data while varying engine speed/load. Verify whether actual pressure follows commanded changes. If actual is fixed or out of range, continue.
- Attach a certified fuel pressure gauge to the rail and measure static and dynamic pressure under specified conditions (idle, rev, load). Compare to commanded values and service limits.
- Test the fuel pressure regulator/control solenoid: verify PWM/duty cycle from ECM, then apply a known PWM or direct power per service procedures to confirm actuator response and rail pressure change.
- Perform fuel pump flow and pressure tests: inspect/replace fuel filter and inlet strainer if flow is low or pressure is unstable.
- Pressure-relief and inspect for external/internal fuel leaks or leaking injectors that may prevent pressure control.
- If wiring and components test OK, consider swapping known-good pressure sensor or regulator (where practical) before ECM replacement. Recheck for codes and correct operation.
- Clear codes and road-test to verify P1112 does not return. If intermittent, monitor long enough to reproduce.
Likely causes
- Fuel pressure sensor giving incorrect voltage or intermittent signal
- Fuel pressure regulator/control solenoid stuck or not modulating
- Low fuel pump output or failing pump motor
- Clogged fuel filter or restricted return line reducing flow
- Connector corrosion or damaged harness at sensor or solenoid
Fault status
Status
P1112 — Fuel pressure control fault. ECM detected fuel rail pressure not matching commanded control parameters or sensor/actuator response outside limits. MIL set; freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
Your experience will help others
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Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
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0
Send to email
Code
P1112
ISUZU
P — Powertrain
Boost Temperature Sensor Circuit Low
Views:
UK: 22
EN: 37
RU: 43
AI status
Completed
Completed
100%
Causes
- Faulty fuel rail pressure sensor (failed or out-of-spec)
- Faulty fuel pressure regulator / control valve or its control solenoid
- Weak or failing fuel pump (low supply or low return flow)
- Clogged fuel filter, strainer or restricted fuel lines/return
- Damaged or corroded wiring, poor connector or open/short to sensor or control solenoid
- PCM/ECM software or internal fault (less common)
Symptoms
- MIL (Check Engine) illuminated
- Hard starting, extended cranking or no-start
- Rough idle or stalling
- Loss of power, hesitation or poor acceleration
- Reduced fuel economy
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze frame data and all stored codes with a capable scan tool.
- Inspect wiring and connectors at the fuel pressure sensor and regulator/solenoid for corrosion, damage or loose pins.
- Check live data: commanded fuel pressure vs actual fuel rail pressure, sensor voltage, and control solenoid duty cycle.
- Visually inspect fuel lines, filter, strainer and fittings for restrictions or leaks.
- Measure fuel rail pressure with a calibrated mechanical/electronic gauge under various engine loads and compare to commanded values.
- Test resistance and supply voltage to the fuel pressure sensor and regulator/solenoid per manufacturer specs.
Signal parameters
- Fuel rail pressure sensor voltage typically 0.5–4.5 V (varies by sensor); reacts proportionally to rail pressure.
- ECM commanded fuel pressure value vs actual rail pressure (scan tool live data) — actual should follow commanded within tolerance under steady-state and transient conditions.
- Fuel pressure regulator/solenoid control signal: PWM duty cycle or pulse frequency 0–100% depending on command.
- Fuel rail pressure ranges: low-idle, cruise and wide-open conditions should show increasing pressure when commanded; significant deviations indicate a problem.
- Sensor resistance/impedance should match factory specification (consult service manual).
Diagnostic algorithm
- Connect a diagnostic scan tool and record freeze frame/live data: note commanded pressure, actual rail pressure, sensor voltage and solenoid duty cycle. Confirm DTC P1112 is current.
- Visually inspect harnesses and connectors for corrosion, bent pins, damaged insulation or poor grounds at the fuel pressure sensor, regulator/solenoid and ECM.
- With key ON (engine off), backprobe sensor connector and verify reference voltage, ground and signal voltage ranges. Compare to spec.
- Start engine (if safe) and observe live data while varying engine speed/load. Verify whether actual pressure follows commanded changes. If actual is fixed or out of range, continue.
- Attach a certified fuel pressure gauge to the rail and measure static and dynamic pressure under specified conditions (idle, rev, load). Compare to commanded values and service limits.
- Test the fuel pressure regulator/control solenoid: verify PWM/duty cycle from ECM, then apply a known PWM or direct power per service procedures to confirm actuator response and rail pressure change.
- Perform fuel pump flow and pressure tests: inspect/replace fuel filter and inlet strainer if flow is low or pressure is unstable.
- Pressure-relief and inspect for external/internal fuel leaks or leaking injectors that may prevent pressure control.
- If wiring and components test OK, consider swapping known-good pressure sensor or regulator (where practical) before ECM replacement. Recheck for codes and correct operation.
- Clear codes and road-test to verify P1112 does not return. If intermittent, monitor long enough to reproduce.
Likely causes
- Fuel pressure sensor giving incorrect voltage or intermittent signal
- Fuel pressure regulator/control solenoid stuck or not modulating
- Low fuel pump output or failing pump motor
- Clogged fuel filter or restricted return line reducing flow
- Connector corrosion or damaged harness at sensor or solenoid
Fault status
Status
P1112 — Fuel pressure control fault. ECM detected fuel rail pressure not matching commanded control parameters or sensor/actuator response outside limits. MIL set; freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P1112
LAND ROVER
P — Powertrain
Intake air temperature sensor 2 low input
Views:
UK: 12
EN: 19
RU: 13
AI status
Completed
Completed
100%
Causes
- Faulty fuel rail pressure sensor (failed or out-of-spec)
- Faulty fuel pressure regulator / control valve or its control solenoid
- Weak or failing fuel pump (low supply or low return flow)
- Clogged fuel filter, strainer or restricted fuel lines/return
- Damaged or corroded wiring, poor connector or open/short to sensor or control solenoid
- PCM/ECM software or internal fault (less common)
Symptoms
- MIL (Check Engine) illuminated
- Hard starting, extended cranking or no-start
- Rough idle or stalling
- Loss of power, hesitation or poor acceleration
- Reduced fuel economy
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze frame data and all stored codes with a capable scan tool.
- Inspect wiring and connectors at the fuel pressure sensor and regulator/solenoid for corrosion, damage or loose pins.
- Check live data: commanded fuel pressure vs actual fuel rail pressure, sensor voltage, and control solenoid duty cycle.
- Visually inspect fuel lines, filter, strainer and fittings for restrictions or leaks.
- Measure fuel rail pressure with a calibrated mechanical/electronic gauge under various engine loads and compare to commanded values.
- Test resistance and supply voltage to the fuel pressure sensor and regulator/solenoid per manufacturer specs.
Signal parameters
- Fuel rail pressure sensor voltage typically 0.5–4.5 V (varies by sensor); reacts proportionally to rail pressure.
- ECM commanded fuel pressure value vs actual rail pressure (scan tool live data) — actual should follow commanded within tolerance under steady-state and transient conditions.
- Fuel pressure regulator/solenoid control signal: PWM duty cycle or pulse frequency 0–100% depending on command.
- Fuel rail pressure ranges: low-idle, cruise and wide-open conditions should show increasing pressure when commanded; significant deviations indicate a problem.
- Sensor resistance/impedance should match factory specification (consult service manual).
Diagnostic algorithm
- Connect a diagnostic scan tool and record freeze frame/live data: note commanded pressure, actual rail pressure, sensor voltage and solenoid duty cycle. Confirm DTC P1112 is current.
- Visually inspect harnesses and connectors for corrosion, bent pins, damaged insulation or poor grounds at the fuel pressure sensor, regulator/solenoid and ECM.
- With key ON (engine off), backprobe sensor connector and verify reference voltage, ground and signal voltage ranges. Compare to spec.
- Start engine (if safe) and observe live data while varying engine speed/load. Verify whether actual pressure follows commanded changes. If actual is fixed or out of range, continue.
- Attach a certified fuel pressure gauge to the rail and measure static and dynamic pressure under specified conditions (idle, rev, load). Compare to commanded values and service limits.
- Test the fuel pressure regulator/control solenoid: verify PWM/duty cycle from ECM, then apply a known PWM or direct power per service procedures to confirm actuator response and rail pressure change.
- Perform fuel pump flow and pressure tests: inspect/replace fuel filter and inlet strainer if flow is low or pressure is unstable.
- Pressure-relief and inspect for external/internal fuel leaks or leaking injectors that may prevent pressure control.
- If wiring and components test OK, consider swapping known-good pressure sensor or regulator (where practical) before ECM replacement. Recheck for codes and correct operation.
- Clear codes and road-test to verify P1112 does not return. If intermittent, monitor long enough to reproduce.
Likely causes
- Fuel pressure sensor giving incorrect voltage or intermittent signal
- Fuel pressure regulator/control solenoid stuck or not modulating
- Low fuel pump output or failing pump motor
- Clogged fuel filter or restricted return line reducing flow
- Connector corrosion or damaged harness at sensor or solenoid
Fault status
Status
P1112 — Fuel pressure control fault. ECM detected fuel rail pressure not matching commanded control parameters or sensor/actuator response outside limits. MIL set; freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
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LAND ROVER 2015 Discovery Sport HSE
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Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
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Code
P1112
LINCOLN
P — Powertrain
Intake Air Temperature Sensor Intermittent
Views:
UK: 27
EN: 48
RU: 41
AI status
Completed
Completed
100%
Causes
- Faulty fuel rail pressure sensor (failed or out-of-spec)
- Faulty fuel pressure regulator / control valve or its control solenoid
- Weak or failing fuel pump (low supply or low return flow)
- Clogged fuel filter, strainer or restricted fuel lines/return
- Damaged or corroded wiring, poor connector or open/short to sensor or control solenoid
- PCM/ECM software or internal fault (less common)
Symptoms
- MIL (Check Engine) illuminated
- Hard starting, extended cranking or no-start
- Rough idle or stalling
- Loss of power, hesitation or poor acceleration
- Reduced fuel economy
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze frame data and all stored codes with a capable scan tool.
- Inspect wiring and connectors at the fuel pressure sensor and regulator/solenoid for corrosion, damage or loose pins.
- Check live data: commanded fuel pressure vs actual fuel rail pressure, sensor voltage, and control solenoid duty cycle.
- Visually inspect fuel lines, filter, strainer and fittings for restrictions or leaks.
- Measure fuel rail pressure with a calibrated mechanical/electronic gauge under various engine loads and compare to commanded values.
- Test resistance and supply voltage to the fuel pressure sensor and regulator/solenoid per manufacturer specs.
Signal parameters
- Fuel rail pressure sensor voltage typically 0.5–4.5 V (varies by sensor); reacts proportionally to rail pressure.
- ECM commanded fuel pressure value vs actual rail pressure (scan tool live data) — actual should follow commanded within tolerance under steady-state and transient conditions.
- Fuel pressure regulator/solenoid control signal: PWM duty cycle or pulse frequency 0–100% depending on command.
- Fuel rail pressure ranges: low-idle, cruise and wide-open conditions should show increasing pressure when commanded; significant deviations indicate a problem.
- Sensor resistance/impedance should match factory specification (consult service manual).
Diagnostic algorithm
- Connect a diagnostic scan tool and record freeze frame/live data: note commanded pressure, actual rail pressure, sensor voltage and solenoid duty cycle. Confirm DTC P1112 is current.
- Visually inspect harnesses and connectors for corrosion, bent pins, damaged insulation or poor grounds at the fuel pressure sensor, regulator/solenoid and ECM.
- With key ON (engine off), backprobe sensor connector and verify reference voltage, ground and signal voltage ranges. Compare to spec.
- Start engine (if safe) and observe live data while varying engine speed/load. Verify whether actual pressure follows commanded changes. If actual is fixed or out of range, continue.
- Attach a certified fuel pressure gauge to the rail and measure static and dynamic pressure under specified conditions (idle, rev, load). Compare to commanded values and service limits.
- Test the fuel pressure regulator/control solenoid: verify PWM/duty cycle from ECM, then apply a known PWM or direct power per service procedures to confirm actuator response and rail pressure change.
- Perform fuel pump flow and pressure tests: inspect/replace fuel filter and inlet strainer if flow is low or pressure is unstable.
- Pressure-relief and inspect for external/internal fuel leaks or leaking injectors that may prevent pressure control.
- If wiring and components test OK, consider swapping known-good pressure sensor or regulator (where practical) before ECM replacement. Recheck for codes and correct operation.
- Clear codes and road-test to verify P1112 does not return. If intermittent, monitor long enough to reproduce.
Likely causes
- Fuel pressure sensor giving incorrect voltage or intermittent signal
- Fuel pressure regulator/control solenoid stuck or not modulating
- Low fuel pump output or failing pump motor
- Clogged fuel filter or restricted return line reducing flow
- Connector corrosion or damaged harness at sensor or solenoid
Fault status
Status
P1112 — Fuel pressure control fault. ECM detected fuel rail pressure not matching commanded control parameters or sensor/actuator response outside limits. MIL set; freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
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Code
P1112
MAZDA
P — Powertrain
Intake Air Temperature Sensor Circuit Intermittent
Views:
UK: 26
EN: 41
RU: 41
AI status
Completed
Completed
100%
Causes
- Faulty fuel rail pressure sensor (failed or out-of-spec)
- Faulty fuel pressure regulator / control valve or its control solenoid
- Weak or failing fuel pump (low supply or low return flow)
- Clogged fuel filter, strainer or restricted fuel lines/return
- Damaged or corroded wiring, poor connector or open/short to sensor or control solenoid
- PCM/ECM software or internal fault (less common)
Symptoms
- MIL (Check Engine) illuminated
- Hard starting, extended cranking or no-start
- Rough idle or stalling
- Loss of power, hesitation or poor acceleration
- Reduced fuel economy
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze frame data and all stored codes with a capable scan tool.
- Inspect wiring and connectors at the fuel pressure sensor and regulator/solenoid for corrosion, damage or loose pins.
- Check live data: commanded fuel pressure vs actual fuel rail pressure, sensor voltage, and control solenoid duty cycle.
- Visually inspect fuel lines, filter, strainer and fittings for restrictions or leaks.
- Measure fuel rail pressure with a calibrated mechanical/electronic gauge under various engine loads and compare to commanded values.
- Test resistance and supply voltage to the fuel pressure sensor and regulator/solenoid per manufacturer specs.
Signal parameters
- Fuel rail pressure sensor voltage typically 0.5–4.5 V (varies by sensor); reacts proportionally to rail pressure.
- ECM commanded fuel pressure value vs actual rail pressure (scan tool live data) — actual should follow commanded within tolerance under steady-state and transient conditions.
- Fuel pressure regulator/solenoid control signal: PWM duty cycle or pulse frequency 0–100% depending on command.
- Fuel rail pressure ranges: low-idle, cruise and wide-open conditions should show increasing pressure when commanded; significant deviations indicate a problem.
- Sensor resistance/impedance should match factory specification (consult service manual).
Diagnostic algorithm
- Connect a diagnostic scan tool and record freeze frame/live data: note commanded pressure, actual rail pressure, sensor voltage and solenoid duty cycle. Confirm DTC P1112 is current.
- Visually inspect harnesses and connectors for corrosion, bent pins, damaged insulation or poor grounds at the fuel pressure sensor, regulator/solenoid and ECM.
- With key ON (engine off), backprobe sensor connector and verify reference voltage, ground and signal voltage ranges. Compare to spec.
- Start engine (if safe) and observe live data while varying engine speed/load. Verify whether actual pressure follows commanded changes. If actual is fixed or out of range, continue.
- Attach a certified fuel pressure gauge to the rail and measure static and dynamic pressure under specified conditions (idle, rev, load). Compare to commanded values and service limits.
- Test the fuel pressure regulator/control solenoid: verify PWM/duty cycle from ECM, then apply a known PWM or direct power per service procedures to confirm actuator response and rail pressure change.
- Perform fuel pump flow and pressure tests: inspect/replace fuel filter and inlet strainer if flow is low or pressure is unstable.
- Pressure-relief and inspect for external/internal fuel leaks or leaking injectors that may prevent pressure control.
- If wiring and components test OK, consider swapping known-good pressure sensor or regulator (where practical) before ECM replacement. Recheck for codes and correct operation.
- Clear codes and road-test to verify P1112 does not return. If intermittent, monitor long enough to reproduce.
Likely causes
- Fuel pressure sensor giving incorrect voltage or intermittent signal
- Fuel pressure regulator/control solenoid stuck or not modulating
- Low fuel pump output or failing pump motor
- Clogged fuel filter or restricted return line reducing flow
- Connector corrosion or damaged harness at sensor or solenoid
Fault status
Status
P1112 — Fuel pressure control fault. ECM detected fuel rail pressure not matching commanded control parameters or sensor/actuator response outside limits. MIL set; freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
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Was this AI description helpful?
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Code
P1112
MERCURY
P — Powertrain
Intake Air Temperature Sensor Intermittent
Views:
UK: 24
EN: 42
RU: 43
AI status
Completed
Completed
100%
Causes
- Faulty fuel rail pressure sensor (failed or out-of-spec)
- Faulty fuel pressure regulator / control valve or its control solenoid
- Weak or failing fuel pump (low supply or low return flow)
- Clogged fuel filter, strainer or restricted fuel lines/return
- Damaged or corroded wiring, poor connector or open/short to sensor or control solenoid
- PCM/ECM software or internal fault (less common)
Symptoms
- MIL (Check Engine) illuminated
- Hard starting, extended cranking or no-start
- Rough idle or stalling
- Loss of power, hesitation or poor acceleration
- Reduced fuel economy
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze frame data and all stored codes with a capable scan tool.
- Inspect wiring and connectors at the fuel pressure sensor and regulator/solenoid for corrosion, damage or loose pins.
- Check live data: commanded fuel pressure vs actual fuel rail pressure, sensor voltage, and control solenoid duty cycle.
- Visually inspect fuel lines, filter, strainer and fittings for restrictions or leaks.
- Measure fuel rail pressure with a calibrated mechanical/electronic gauge under various engine loads and compare to commanded values.
- Test resistance and supply voltage to the fuel pressure sensor and regulator/solenoid per manufacturer specs.
Signal parameters
- Fuel rail pressure sensor voltage typically 0.5–4.5 V (varies by sensor); reacts proportionally to rail pressure.
- ECM commanded fuel pressure value vs actual rail pressure (scan tool live data) — actual should follow commanded within tolerance under steady-state and transient conditions.
- Fuel pressure regulator/solenoid control signal: PWM duty cycle or pulse frequency 0–100% depending on command.
- Fuel rail pressure ranges: low-idle, cruise and wide-open conditions should show increasing pressure when commanded; significant deviations indicate a problem.
- Sensor resistance/impedance should match factory specification (consult service manual).
Diagnostic algorithm
- Connect a diagnostic scan tool and record freeze frame/live data: note commanded pressure, actual rail pressure, sensor voltage and solenoid duty cycle. Confirm DTC P1112 is current.
- Visually inspect harnesses and connectors for corrosion, bent pins, damaged insulation or poor grounds at the fuel pressure sensor, regulator/solenoid and ECM.
- With key ON (engine off), backprobe sensor connector and verify reference voltage, ground and signal voltage ranges. Compare to spec.
- Start engine (if safe) and observe live data while varying engine speed/load. Verify whether actual pressure follows commanded changes. If actual is fixed or out of range, continue.
- Attach a certified fuel pressure gauge to the rail and measure static and dynamic pressure under specified conditions (idle, rev, load). Compare to commanded values and service limits.
- Test the fuel pressure regulator/control solenoid: verify PWM/duty cycle from ECM, then apply a known PWM or direct power per service procedures to confirm actuator response and rail pressure change.
- Perform fuel pump flow and pressure tests: inspect/replace fuel filter and inlet strainer if flow is low or pressure is unstable.
- Pressure-relief and inspect for external/internal fuel leaks or leaking injectors that may prevent pressure control.
- If wiring and components test OK, consider swapping known-good pressure sensor or regulator (where practical) before ECM replacement. Recheck for codes and correct operation.
- Clear codes and road-test to verify P1112 does not return. If intermittent, monitor long enough to reproduce.
Likely causes
- Fuel pressure sensor giving incorrect voltage or intermittent signal
- Fuel pressure regulator/control solenoid stuck or not modulating
- Low fuel pump output or failing pump motor
- Clogged fuel filter or restricted return line reducing flow
- Connector corrosion or damaged harness at sensor or solenoid
Fault status
Status
P1112 — Fuel pressure control fault. ECM detected fuel rail pressure not matching commanded control parameters or sensor/actuator response outside limits. MIL set; freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
Your experience will help others
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Was this AI description helpful?
Your feedback helps improve AI descriptions.
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Code
P1112
OLDSMOBILE
P — Powertrain
Intake Air Temperature IAT Sensor Circuit Intermittent Low Voltage
Views:
UK: 25
EN: 42
RU: 40
AI status
Completed
Completed
100%
Causes
- Faulty fuel rail pressure sensor (failed or out-of-spec)
- Faulty fuel pressure regulator / control valve or its control solenoid
- Weak or failing fuel pump (low supply or low return flow)
- Clogged fuel filter, strainer or restricted fuel lines/return
- Damaged or corroded wiring, poor connector or open/short to sensor or control solenoid
- PCM/ECM software or internal fault (less common)
Symptoms
- MIL (Check Engine) illuminated
- Hard starting, extended cranking or no-start
- Rough idle or stalling
- Loss of power, hesitation or poor acceleration
- Reduced fuel economy
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze frame data and all stored codes with a capable scan tool.
- Inspect wiring and connectors at the fuel pressure sensor and regulator/solenoid for corrosion, damage or loose pins.
- Check live data: commanded fuel pressure vs actual fuel rail pressure, sensor voltage, and control solenoid duty cycle.
- Visually inspect fuel lines, filter, strainer and fittings for restrictions or leaks.
- Measure fuel rail pressure with a calibrated mechanical/electronic gauge under various engine loads and compare to commanded values.
- Test resistance and supply voltage to the fuel pressure sensor and regulator/solenoid per manufacturer specs.
Signal parameters
- Fuel rail pressure sensor voltage typically 0.5–4.5 V (varies by sensor); reacts proportionally to rail pressure.
- ECM commanded fuel pressure value vs actual rail pressure (scan tool live data) — actual should follow commanded within tolerance under steady-state and transient conditions.
- Fuel pressure regulator/solenoid control signal: PWM duty cycle or pulse frequency 0–100% depending on command.
- Fuel rail pressure ranges: low-idle, cruise and wide-open conditions should show increasing pressure when commanded; significant deviations indicate a problem.
- Sensor resistance/impedance should match factory specification (consult service manual).
Diagnostic algorithm
- Connect a diagnostic scan tool and record freeze frame/live data: note commanded pressure, actual rail pressure, sensor voltage and solenoid duty cycle. Confirm DTC P1112 is current.
- Visually inspect harnesses and connectors for corrosion, bent pins, damaged insulation or poor grounds at the fuel pressure sensor, regulator/solenoid and ECM.
- With key ON (engine off), backprobe sensor connector and verify reference voltage, ground and signal voltage ranges. Compare to spec.
- Start engine (if safe) and observe live data while varying engine speed/load. Verify whether actual pressure follows commanded changes. If actual is fixed or out of range, continue.
- Attach a certified fuel pressure gauge to the rail and measure static and dynamic pressure under specified conditions (idle, rev, load). Compare to commanded values and service limits.
- Test the fuel pressure regulator/control solenoid: verify PWM/duty cycle from ECM, then apply a known PWM or direct power per service procedures to confirm actuator response and rail pressure change.
- Perform fuel pump flow and pressure tests: inspect/replace fuel filter and inlet strainer if flow is low or pressure is unstable.
- Pressure-relief and inspect for external/internal fuel leaks or leaking injectors that may prevent pressure control.
- If wiring and components test OK, consider swapping known-good pressure sensor or regulator (where practical) before ECM replacement. Recheck for codes and correct operation.
- Clear codes and road-test to verify P1112 does not return. If intermittent, monitor long enough to reproduce.
Likely causes
- Fuel pressure sensor giving incorrect voltage or intermittent signal
- Fuel pressure regulator/control solenoid stuck or not modulating
- Low fuel pump output or failing pump motor
- Clogged fuel filter or restricted return line reducing flow
- Connector corrosion or damaged harness at sensor or solenoid
Fault status
Status
P1112 — Fuel pressure control fault. ECM detected fuel rail pressure not matching commanded control parameters or sensor/actuator response outside limits. MIL set; freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P1112
Other
P — Powertrain
Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage
Views:
UK: 27
EN: 41
RU: 42
AI status
Completed
Completed
100%
Causes
- Faulty fuel rail pressure sensor (failed or out-of-spec)
- Faulty fuel pressure regulator / control valve or its control solenoid
- Weak or failing fuel pump (low supply or low return flow)
- Clogged fuel filter, strainer or restricted fuel lines/return
- Damaged or corroded wiring, poor connector or open/short to sensor or control solenoid
- PCM/ECM software or internal fault (less common)
Symptoms
- MIL (Check Engine) illuminated
- Hard starting, extended cranking or no-start
- Rough idle or stalling
- Loss of power, hesitation or poor acceleration
- Reduced fuel economy
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze frame data and all stored codes with a capable scan tool.
- Inspect wiring and connectors at the fuel pressure sensor and regulator/solenoid for corrosion, damage or loose pins.
- Check live data: commanded fuel pressure vs actual fuel rail pressure, sensor voltage, and control solenoid duty cycle.
- Visually inspect fuel lines, filter, strainer and fittings for restrictions or leaks.
- Measure fuel rail pressure with a calibrated mechanical/electronic gauge under various engine loads and compare to commanded values.
- Test resistance and supply voltage to the fuel pressure sensor and regulator/solenoid per manufacturer specs.
Signal parameters
- Fuel rail pressure sensor voltage typically 0.5–4.5 V (varies by sensor); reacts proportionally to rail pressure.
- ECM commanded fuel pressure value vs actual rail pressure (scan tool live data) — actual should follow commanded within tolerance under steady-state and transient conditions.
- Fuel pressure regulator/solenoid control signal: PWM duty cycle or pulse frequency 0–100% depending on command.
- Fuel rail pressure ranges: low-idle, cruise and wide-open conditions should show increasing pressure when commanded; significant deviations indicate a problem.
- Sensor resistance/impedance should match factory specification (consult service manual).
Diagnostic algorithm
- Connect a diagnostic scan tool and record freeze frame/live data: note commanded pressure, actual rail pressure, sensor voltage and solenoid duty cycle. Confirm DTC P1112 is current.
- Visually inspect harnesses and connectors for corrosion, bent pins, damaged insulation or poor grounds at the fuel pressure sensor, regulator/solenoid and ECM.
- With key ON (engine off), backprobe sensor connector and verify reference voltage, ground and signal voltage ranges. Compare to spec.
- Start engine (if safe) and observe live data while varying engine speed/load. Verify whether actual pressure follows commanded changes. If actual is fixed or out of range, continue.
- Attach a certified fuel pressure gauge to the rail and measure static and dynamic pressure under specified conditions (idle, rev, load). Compare to commanded values and service limits.
- Test the fuel pressure regulator/control solenoid: verify PWM/duty cycle from ECM, then apply a known PWM or direct power per service procedures to confirm actuator response and rail pressure change.
- Perform fuel pump flow and pressure tests: inspect/replace fuel filter and inlet strainer if flow is low or pressure is unstable.
- Pressure-relief and inspect for external/internal fuel leaks or leaking injectors that may prevent pressure control.
- If wiring and components test OK, consider swapping known-good pressure sensor or regulator (where practical) before ECM replacement. Recheck for codes and correct operation.
- Clear codes and road-test to verify P1112 does not return. If intermittent, monitor long enough to reproduce.
Likely causes
- Fuel pressure sensor giving incorrect voltage or intermittent signal
- Fuel pressure regulator/control solenoid stuck or not modulating
- Low fuel pump output or failing pump motor
- Clogged fuel filter or restricted return line reducing flow
- Connector corrosion or damaged harness at sensor or solenoid
Fault status
Status
P1112 — Fuel pressure control fault. ECM detected fuel rail pressure not matching commanded control parameters or sensor/actuator response outside limits. MIL set; freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
Workshop Manuals
Available brands with manuals
2
AUDI 11
6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)
Workshop Manual199,00 UAH
Audi A3 (1997) – 1.6L 4-cylinder (2‑valve) Engine Mechanical Components Service Manual (AEH, AKL, APF) – Edition 07.2002
Workshop Manual199,00 UAH
AUDI A3 (2004) Workshop Manual — 2.0L FSI Turbo (4‑cyl, 4‑valve) Engine, Mechanics — Edition 03.2017
Workshop Manual199,00 UAH
Audi A3 2004 — Electrical System (Workshop Manual, Edition 02.2018)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)
Workshop Manual199,00 UAH
Audi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)
Workshop Manual199,00 UAH
Audi Q4 e-tron (Type F4) - Self-study Programme SSP 685
Workshop Manual199,00 UAH
Audi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)
Workshop Manual199,00 UAH
Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)
Workshop Manual199,00 UAH
LAND ROVER 3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P1112
SATURN
P — Powertrain
Intake Air Temperature IAT Sensor Circuit Intermittent Low Voltage
Views:
UK: 25
EN: 41
RU: 45
AI status
Completed
Completed
100%
Causes
- Faulty fuel rail pressure sensor (failed or out-of-spec)
- Faulty fuel pressure regulator / control valve or its control solenoid
- Weak or failing fuel pump (low supply or low return flow)
- Clogged fuel filter, strainer or restricted fuel lines/return
- Damaged or corroded wiring, poor connector or open/short to sensor or control solenoid
- PCM/ECM software or internal fault (less common)
Symptoms
- MIL (Check Engine) illuminated
- Hard starting, extended cranking or no-start
- Rough idle or stalling
- Loss of power, hesitation or poor acceleration
- Reduced fuel economy
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze frame data and all stored codes with a capable scan tool.
- Inspect wiring and connectors at the fuel pressure sensor and regulator/solenoid for corrosion, damage or loose pins.
- Check live data: commanded fuel pressure vs actual fuel rail pressure, sensor voltage, and control solenoid duty cycle.
- Visually inspect fuel lines, filter, strainer and fittings for restrictions or leaks.
- Measure fuel rail pressure with a calibrated mechanical/electronic gauge under various engine loads and compare to commanded values.
- Test resistance and supply voltage to the fuel pressure sensor and regulator/solenoid per manufacturer specs.
Signal parameters
- Fuel rail pressure sensor voltage typically 0.5–4.5 V (varies by sensor); reacts proportionally to rail pressure.
- ECM commanded fuel pressure value vs actual rail pressure (scan tool live data) — actual should follow commanded within tolerance under steady-state and transient conditions.
- Fuel pressure regulator/solenoid control signal: PWM duty cycle or pulse frequency 0–100% depending on command.
- Fuel rail pressure ranges: low-idle, cruise and wide-open conditions should show increasing pressure when commanded; significant deviations indicate a problem.
- Sensor resistance/impedance should match factory specification (consult service manual).
Diagnostic algorithm
- Connect a diagnostic scan tool and record freeze frame/live data: note commanded pressure, actual rail pressure, sensor voltage and solenoid duty cycle. Confirm DTC P1112 is current.
- Visually inspect harnesses and connectors for corrosion, bent pins, damaged insulation or poor grounds at the fuel pressure sensor, regulator/solenoid and ECM.
- With key ON (engine off), backprobe sensor connector and verify reference voltage, ground and signal voltage ranges. Compare to spec.
- Start engine (if safe) and observe live data while varying engine speed/load. Verify whether actual pressure follows commanded changes. If actual is fixed or out of range, continue.
- Attach a certified fuel pressure gauge to the rail and measure static and dynamic pressure under specified conditions (idle, rev, load). Compare to commanded values and service limits.
- Test the fuel pressure regulator/control solenoid: verify PWM/duty cycle from ECM, then apply a known PWM or direct power per service procedures to confirm actuator response and rail pressure change.
- Perform fuel pump flow and pressure tests: inspect/replace fuel filter and inlet strainer if flow is low or pressure is unstable.
- Pressure-relief and inspect for external/internal fuel leaks or leaking injectors that may prevent pressure control.
- If wiring and components test OK, consider swapping known-good pressure sensor or regulator (where practical) before ECM replacement. Recheck for codes and correct operation.
- Clear codes and road-test to verify P1112 does not return. If intermittent, monitor long enough to reproduce.
Likely causes
- Fuel pressure sensor giving incorrect voltage or intermittent signal
- Fuel pressure regulator/control solenoid stuck or not modulating
- Low fuel pump output or failing pump motor
- Clogged fuel filter or restricted return line reducing flow
- Connector corrosion or damaged harness at sensor or solenoid
Fault status
Status
P1112 — Fuel pressure control fault. ECM detected fuel rail pressure not matching commanded control parameters or sensor/actuator response outside limits. MIL set; freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P1112
SUBARU
P — Powertrain
Atmospheric Pressure Sensor Range Performance Problem
Views:
UK: 26
EN: 41
RU: 39
AI status
Completed
Completed
100%
Causes
- Faulty fuel rail pressure sensor (failed or out-of-spec)
- Faulty fuel pressure regulator / control valve or its control solenoid
- Weak or failing fuel pump (low supply or low return flow)
- Clogged fuel filter, strainer or restricted fuel lines/return
- Damaged or corroded wiring, poor connector or open/short to sensor or control solenoid
- PCM/ECM software or internal fault (less common)
Symptoms
- MIL (Check Engine) illuminated
- Hard starting, extended cranking or no-start
- Rough idle or stalling
- Loss of power, hesitation or poor acceleration
- Reduced fuel economy
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze frame data and all stored codes with a capable scan tool.
- Inspect wiring and connectors at the fuel pressure sensor and regulator/solenoid for corrosion, damage or loose pins.
- Check live data: commanded fuel pressure vs actual fuel rail pressure, sensor voltage, and control solenoid duty cycle.
- Visually inspect fuel lines, filter, strainer and fittings for restrictions or leaks.
- Measure fuel rail pressure with a calibrated mechanical/electronic gauge under various engine loads and compare to commanded values.
- Test resistance and supply voltage to the fuel pressure sensor and regulator/solenoid per manufacturer specs.
Signal parameters
- Fuel rail pressure sensor voltage typically 0.5–4.5 V (varies by sensor); reacts proportionally to rail pressure.
- ECM commanded fuel pressure value vs actual rail pressure (scan tool live data) — actual should follow commanded within tolerance under steady-state and transient conditions.
- Fuel pressure regulator/solenoid control signal: PWM duty cycle or pulse frequency 0–100% depending on command.
- Fuel rail pressure ranges: low-idle, cruise and wide-open conditions should show increasing pressure when commanded; significant deviations indicate a problem.
- Sensor resistance/impedance should match factory specification (consult service manual).
Diagnostic algorithm
- Connect a diagnostic scan tool and record freeze frame/live data: note commanded pressure, actual rail pressure, sensor voltage and solenoid duty cycle. Confirm DTC P1112 is current.
- Visually inspect harnesses and connectors for corrosion, bent pins, damaged insulation or poor grounds at the fuel pressure sensor, regulator/solenoid and ECM.
- With key ON (engine off), backprobe sensor connector and verify reference voltage, ground and signal voltage ranges. Compare to spec.
- Start engine (if safe) and observe live data while varying engine speed/load. Verify whether actual pressure follows commanded changes. If actual is fixed or out of range, continue.
- Attach a certified fuel pressure gauge to the rail and measure static and dynamic pressure under specified conditions (idle, rev, load). Compare to commanded values and service limits.
- Test the fuel pressure regulator/control solenoid: verify PWM/duty cycle from ECM, then apply a known PWM or direct power per service procedures to confirm actuator response and rail pressure change.
- Perform fuel pump flow and pressure tests: inspect/replace fuel filter and inlet strainer if flow is low or pressure is unstable.
- Pressure-relief and inspect for external/internal fuel leaks or leaking injectors that may prevent pressure control.
- If wiring and components test OK, consider swapping known-good pressure sensor or regulator (where practical) before ECM replacement. Recheck for codes and correct operation.
- Clear codes and road-test to verify P1112 does not return. If intermittent, monitor long enough to reproduce.
Likely causes
- Fuel pressure sensor giving incorrect voltage or intermittent signal
- Fuel pressure regulator/control solenoid stuck or not modulating
- Low fuel pump output or failing pump motor
- Clogged fuel filter or restricted return line reducing flow
- Connector corrosion or damaged harness at sensor or solenoid
Fault status
Status
P1112 — Fuel pressure control fault. ECM detected fuel rail pressure not matching commanded control parameters or sensor/actuator response outside limits. MIL set; freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
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Code
P1112
VOLKSWAGEN
P — Powertrain
Oxygen Sensor Control Bank 1 System Too Rich
Views:
UK: 27
EN: 47
RU: 45
AI status
Completed
Completed
100%
Causes
- Faulty fuel rail pressure sensor (failed or out-of-spec)
- Faulty fuel pressure regulator / control valve or its control solenoid
- Weak or failing fuel pump (low supply or low return flow)
- Clogged fuel filter, strainer or restricted fuel lines/return
- Damaged or corroded wiring, poor connector or open/short to sensor or control solenoid
- PCM/ECM software or internal fault (less common)
Symptoms
- MIL (Check Engine) illuminated
- Hard starting, extended cranking or no-start
- Rough idle or stalling
- Loss of power, hesitation or poor acceleration
- Reduced fuel economy
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze frame data and all stored codes with a capable scan tool.
- Inspect wiring and connectors at the fuel pressure sensor and regulator/solenoid for corrosion, damage or loose pins.
- Check live data: commanded fuel pressure vs actual fuel rail pressure, sensor voltage, and control solenoid duty cycle.
- Visually inspect fuel lines, filter, strainer and fittings for restrictions or leaks.
- Measure fuel rail pressure with a calibrated mechanical/electronic gauge under various engine loads and compare to commanded values.
- Test resistance and supply voltage to the fuel pressure sensor and regulator/solenoid per manufacturer specs.
Signal parameters
- Fuel rail pressure sensor voltage typically 0.5–4.5 V (varies by sensor); reacts proportionally to rail pressure.
- ECM commanded fuel pressure value vs actual rail pressure (scan tool live data) — actual should follow commanded within tolerance under steady-state and transient conditions.
- Fuel pressure regulator/solenoid control signal: PWM duty cycle or pulse frequency 0–100% depending on command.
- Fuel rail pressure ranges: low-idle, cruise and wide-open conditions should show increasing pressure when commanded; significant deviations indicate a problem.
- Sensor resistance/impedance should match factory specification (consult service manual).
Diagnostic algorithm
- Connect a diagnostic scan tool and record freeze frame/live data: note commanded pressure, actual rail pressure, sensor voltage and solenoid duty cycle. Confirm DTC P1112 is current.
- Visually inspect harnesses and connectors for corrosion, bent pins, damaged insulation or poor grounds at the fuel pressure sensor, regulator/solenoid and ECM.
- With key ON (engine off), backprobe sensor connector and verify reference voltage, ground and signal voltage ranges. Compare to spec.
- Start engine (if safe) and observe live data while varying engine speed/load. Verify whether actual pressure follows commanded changes. If actual is fixed or out of range, continue.
- Attach a certified fuel pressure gauge to the rail and measure static and dynamic pressure under specified conditions (idle, rev, load). Compare to commanded values and service limits.
- Test the fuel pressure regulator/control solenoid: verify PWM/duty cycle from ECM, then apply a known PWM or direct power per service procedures to confirm actuator response and rail pressure change.
- Perform fuel pump flow and pressure tests: inspect/replace fuel filter and inlet strainer if flow is low or pressure is unstable.
- Pressure-relief and inspect for external/internal fuel leaks or leaking injectors that may prevent pressure control.
- If wiring and components test OK, consider swapping known-good pressure sensor or regulator (where practical) before ECM replacement. Recheck for codes and correct operation.
- Clear codes and road-test to verify P1112 does not return. If intermittent, monitor long enough to reproduce.
Likely causes
- Fuel pressure sensor giving incorrect voltage or intermittent signal
- Fuel pressure regulator/control solenoid stuck or not modulating
- Low fuel pump output or failing pump motor
- Clogged fuel filter or restricted return line reducing flow
- Connector corrosion or damaged harness at sensor or solenoid
Fault status
Status
P1112 — Fuel pressure control fault. ECM detected fuel rail pressure not matching commanded control parameters or sensor/actuator response outside limits. MIL set; freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
Your experience will help others
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