Code
P0045
Generic
P — Powertrain
Turbocharger/Supercharger Boost Control A Circuit/Open
Views:
UK: 15
EN: 52
RU: 28
AI status
Completed
Completed
100%
Causes
- Broken, chafed, or disconnected wiring in the boost control A circuit
- Corroded or loose connector at the boost control solenoid/actuator
- Failed boost control solenoid, valve or actuator (open coil)
- Blown fuse or poor power supply to the solenoid circuit
- Poor ground or damaged ECM connector pin for the control output
- ECM or powertrain control module output driver fault
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated with P0045 stored
- Reduced engine power, poor acceleration or limp-home mode
- Engine may produce lower-than-expected boost (underboost)
- Hesitation or lack of turbo response
- In some cases, erratic boost or overboost protection may be observed if control is intermittent
What to check
- Read freeze frame and live data with a scan tool: commanded boost duty, actual boost pressure, related sensors (MAP/boost sensor)
- Visually inspect wiring and connector at the boost control solenoid/actuator for damage, corrosion, pins pushed out, or water intrusion
- Check fuses and power feed to the solenoid circuit
- Backprobe the solenoid connector while engine is running to measure supply and control signals
- Measure resistance of the solenoid coil with it disconnected (compare to specification)
- Perform continuity test from ECM control pin to solenoid connector pin to locate opens or high resistance
Signal parameters
- Typical solenoid coil resistance (nominal): ~20–40 ohms (varies by vehicle) — check OEM spec
- Supply voltage at power feed: near battery voltage (11–14 V) with ignition ON
- Control output: ECU typically provides a switched ground or PWM signal; duty cycle 0–100% depending on commanded boost
- PWM frequency commonly in tens to a few hundred Hz (vehicle-specific)
- Expected behavior: with commanded activation the control pin will show PWM/duty cycle change; open circuit shows no continuity or no control signal response
Diagnostic algorithm
- Connect a scan tool and confirm P0045 is active; record freeze frame and live data (commanded boost duty, measured boost/MAP)
- Inspect harness and connector at the boost control solenoid A for physical damage, corrosion, loosened terminals or contamination
- With ignition OFF disconnect solenoid and measure coil resistance; compare to spec — infinite or very high resistance indicates open solenoid
- With harness disconnected, check supply pin for battery voltage with ignition ON; check ground pin for continuity to engine ground
- Backprobe the ECM control pin (or appropriate harness pin) with ignition ON and while commanding boost control from scan tool; verify presence of PWM or switching signal and correct voltage levels
- If control signal is present at ECM but not at solenoid connector, locate and repair open/short in harness (splice repair, replace connector, re-route, protect)
- If no control signal at ECM output, check ECM connector pins for damage and verify fuse/power/grounds; consider ECM driver fault if wiring and solenoid are proven good
- If wiring and ECM outputs are good but solenoid failed bench test, replace solenoid/valve/actuator and re-test
- Clear codes and perform a controlled road/simulation test to verify boost control and ensure P0045 does not return
Likely causes
- Damaged harness or pin at the solenoid connector (most common)
- Failed boost control solenoid (stuck open or open coil)
- Corroded connector or poor ground causing open/high resistance
- Blown fuse or loss of battery feed to the solenoid
- ECM output driver failure (less common)
Fault status
Status
P0045 — Boost control A circuit open or high resistance detected. The ECM cannot command or detect the boost control solenoid/actuator A; inspect wiring, connector, fuse, solenoid, and ECM output.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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Code
P0045
ISUZU
P — Powertrain
Turbocharger Boost Control Solenoid Circuit
Views:
UK: 8
EN: 18
RU: 19
AI status
Completed
Completed
100%
Causes
- Broken, chafed, or disconnected wiring in the boost control A circuit
- Corroded or loose connector at the boost control solenoid/actuator
- Failed boost control solenoid, valve or actuator (open coil)
- Blown fuse or poor power supply to the solenoid circuit
- Poor ground or damaged ECM connector pin for the control output
- ECM or powertrain control module output driver fault
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated with P0045 stored
- Reduced engine power, poor acceleration or limp-home mode
- Engine may produce lower-than-expected boost (underboost)
- Hesitation or lack of turbo response
- In some cases, erratic boost or overboost protection may be observed if control is intermittent
What to check
- Read freeze frame and live data with a scan tool: commanded boost duty, actual boost pressure, related sensors (MAP/boost sensor)
- Visually inspect wiring and connector at the boost control solenoid/actuator for damage, corrosion, pins pushed out, or water intrusion
- Check fuses and power feed to the solenoid circuit
- Backprobe the solenoid connector while engine is running to measure supply and control signals
- Measure resistance of the solenoid coil with it disconnected (compare to specification)
- Perform continuity test from ECM control pin to solenoid connector pin to locate opens or high resistance
Signal parameters
- Typical solenoid coil resistance (nominal): ~20–40 ohms (varies by vehicle) — check OEM spec
- Supply voltage at power feed: near battery voltage (11–14 V) with ignition ON
- Control output: ECU typically provides a switched ground or PWM signal; duty cycle 0–100% depending on commanded boost
- PWM frequency commonly in tens to a few hundred Hz (vehicle-specific)
- Expected behavior: with commanded activation the control pin will show PWM/duty cycle change; open circuit shows no continuity or no control signal response
Diagnostic algorithm
- Connect a scan tool and confirm P0045 is active; record freeze frame and live data (commanded boost duty, measured boost/MAP)
- Inspect harness and connector at the boost control solenoid A for physical damage, corrosion, loosened terminals or contamination
- With ignition OFF disconnect solenoid and measure coil resistance; compare to spec — infinite or very high resistance indicates open solenoid
- With harness disconnected, check supply pin for battery voltage with ignition ON; check ground pin for continuity to engine ground
- Backprobe the ECM control pin (or appropriate harness pin) with ignition ON and while commanding boost control from scan tool; verify presence of PWM or switching signal and correct voltage levels
- If control signal is present at ECM but not at solenoid connector, locate and repair open/short in harness (splice repair, replace connector, re-route, protect)
- If no control signal at ECM output, check ECM connector pins for damage and verify fuse/power/grounds; consider ECM driver fault if wiring and solenoid are proven good
- If wiring and ECM outputs are good but solenoid failed bench test, replace solenoid/valve/actuator and re-test
- Clear codes and perform a controlled road/simulation test to verify boost control and ensure P0045 does not return
Likely causes
- Damaged harness or pin at the solenoid connector (most common)
- Failed boost control solenoid (stuck open or open coil)
- Corroded connector or poor ground causing open/high resistance
- Blown fuse or loss of battery feed to the solenoid
- ECM output driver failure (less common)
Fault status
Status
P0045 — Boost control A circuit open or high resistance detected. The ECM cannot command or detect the boost control solenoid/actuator A; inspect wiring, connector, fuse, solenoid, and ECM output.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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Code
P0045
LAND ROVER
P — Powertrain
Turbo / compressor control boost solenoid cycle / open
Views:
UK: 3
EN: 9
RU: 12
AI status
Completed
Completed
100%
Causes
- Broken, chafed, or disconnected wiring in the boost control A circuit
- Corroded or loose connector at the boost control solenoid/actuator
- Failed boost control solenoid, valve or actuator (open coil)
- Blown fuse or poor power supply to the solenoid circuit
- Poor ground or damaged ECM connector pin for the control output
- ECM or powertrain control module output driver fault
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated with P0045 stored
- Reduced engine power, poor acceleration or limp-home mode
- Engine may produce lower-than-expected boost (underboost)
- Hesitation or lack of turbo response
- In some cases, erratic boost or overboost protection may be observed if control is intermittent
What to check
- Read freeze frame and live data with a scan tool: commanded boost duty, actual boost pressure, related sensors (MAP/boost sensor)
- Visually inspect wiring and connector at the boost control solenoid/actuator for damage, corrosion, pins pushed out, or water intrusion
- Check fuses and power feed to the solenoid circuit
- Backprobe the solenoid connector while engine is running to measure supply and control signals
- Measure resistance of the solenoid coil with it disconnected (compare to specification)
- Perform continuity test from ECM control pin to solenoid connector pin to locate opens or high resistance
Signal parameters
- Typical solenoid coil resistance (nominal): ~20–40 ohms (varies by vehicle) — check OEM spec
- Supply voltage at power feed: near battery voltage (11–14 V) with ignition ON
- Control output: ECU typically provides a switched ground or PWM signal; duty cycle 0–100% depending on commanded boost
- PWM frequency commonly in tens to a few hundred Hz (vehicle-specific)
- Expected behavior: with commanded activation the control pin will show PWM/duty cycle change; open circuit shows no continuity or no control signal response
Diagnostic algorithm
- Connect a scan tool and confirm P0045 is active; record freeze frame and live data (commanded boost duty, measured boost/MAP)
- Inspect harness and connector at the boost control solenoid A for physical damage, corrosion, loosened terminals or contamination
- With ignition OFF disconnect solenoid and measure coil resistance; compare to spec — infinite or very high resistance indicates open solenoid
- With harness disconnected, check supply pin for battery voltage with ignition ON; check ground pin for continuity to engine ground
- Backprobe the ECM control pin (or appropriate harness pin) with ignition ON and while commanding boost control from scan tool; verify presence of PWM or switching signal and correct voltage levels
- If control signal is present at ECM but not at solenoid connector, locate and repair open/short in harness (splice repair, replace connector, re-route, protect)
- If no control signal at ECM output, check ECM connector pins for damage and verify fuse/power/grounds; consider ECM driver fault if wiring and solenoid are proven good
- If wiring and ECM outputs are good but solenoid failed bench test, replace solenoid/valve/actuator and re-test
- Clear codes and perform a controlled road/simulation test to verify boost control and ensure P0045 does not return
Likely causes
- Damaged harness or pin at the solenoid connector (most common)
- Failed boost control solenoid (stuck open or open coil)
- Corroded connector or poor ground causing open/high resistance
- Blown fuse or loss of battery feed to the solenoid
- ECM output driver failure (less common)
Fault status
Status
P0045 — Boost control A circuit open or high resistance detected. The ECM cannot command or detect the boost control solenoid/actuator A; inspect wiring, connector, fuse, solenoid, and ECM output.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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Code
P0045
MITSUBISHI
P — Powertrain
Boost control solenoid
Views:
UK: 4
EN: 11
RU: 12
AI status
Completed
Completed
100%
Causes
- Broken, chafed, or disconnected wiring in the boost control A circuit
- Corroded or loose connector at the boost control solenoid/actuator
- Failed boost control solenoid, valve or actuator (open coil)
- Blown fuse or poor power supply to the solenoid circuit
- Poor ground or damaged ECM connector pin for the control output
- ECM or powertrain control module output driver fault
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated with P0045 stored
- Reduced engine power, poor acceleration or limp-home mode
- Engine may produce lower-than-expected boost (underboost)
- Hesitation or lack of turbo response
- In some cases, erratic boost or overboost protection may be observed if control is intermittent
What to check
- Read freeze frame and live data with a scan tool: commanded boost duty, actual boost pressure, related sensors (MAP/boost sensor)
- Visually inspect wiring and connector at the boost control solenoid/actuator for damage, corrosion, pins pushed out, or water intrusion
- Check fuses and power feed to the solenoid circuit
- Backprobe the solenoid connector while engine is running to measure supply and control signals
- Measure resistance of the solenoid coil with it disconnected (compare to specification)
- Perform continuity test from ECM control pin to solenoid connector pin to locate opens or high resistance
Signal parameters
- Typical solenoid coil resistance (nominal): ~20–40 ohms (varies by vehicle) — check OEM spec
- Supply voltage at power feed: near battery voltage (11–14 V) with ignition ON
- Control output: ECU typically provides a switched ground or PWM signal; duty cycle 0–100% depending on commanded boost
- PWM frequency commonly in tens to a few hundred Hz (vehicle-specific)
- Expected behavior: with commanded activation the control pin will show PWM/duty cycle change; open circuit shows no continuity or no control signal response
Diagnostic algorithm
- Connect a scan tool and confirm P0045 is active; record freeze frame and live data (commanded boost duty, measured boost/MAP)
- Inspect harness and connector at the boost control solenoid A for physical damage, corrosion, loosened terminals or contamination
- With ignition OFF disconnect solenoid and measure coil resistance; compare to spec — infinite or very high resistance indicates open solenoid
- With harness disconnected, check supply pin for battery voltage with ignition ON; check ground pin for continuity to engine ground
- Backprobe the ECM control pin (or appropriate harness pin) with ignition ON and while commanding boost control from scan tool; verify presence of PWM or switching signal and correct voltage levels
- If control signal is present at ECM but not at solenoid connector, locate and repair open/short in harness (splice repair, replace connector, re-route, protect)
- If no control signal at ECM output, check ECM connector pins for damage and verify fuse/power/grounds; consider ECM driver fault if wiring and solenoid are proven good
- If wiring and ECM outputs are good but solenoid failed bench test, replace solenoid/valve/actuator and re-test
- Clear codes and perform a controlled road/simulation test to verify boost control and ensure P0045 does not return
Likely causes
- Damaged harness or pin at the solenoid connector (most common)
- Failed boost control solenoid (stuck open or open coil)
- Corroded connector or poor ground causing open/high resistance
- Blown fuse or loss of battery feed to the solenoid
- ECM output driver failure (less common)
Fault status
Status
P0045 — Boost control A circuit open or high resistance detected. The ECM cannot command or detect the boost control solenoid/actuator A; inspect wiring, connector, fuse, solenoid, and ECM output.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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0
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