Code
P1275
BUICK
P — Powertrain
Accelerator Pedal Position (APP) Sensor 1 Circuit
Views:
UK: 15
EN: 34
RU: 21
AI status
Completed
Completed
100%
Causes
- Damaged or corroded wiring or connector in APP sensor harness
- Open or short to battery voltage or ground on the APP signal or reference wires
- Failed APP sensor (internal fault)
- Poor or intermittent 5V reference or ground from ECM
- Poor connector pins or moisture/contamination in connector
- Faulty ECM (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine power / limp-home mode
- Poor or delayed throttle response, hesitation
- Surging or unexpected throttle behavior
- Possible no-start or stall in severe faults
- Stored or pending DTC; driveability issues related to throttle control
What to check
- Retrieve freeze frame and DTC status with a scan tool; note other related codes
- Visually inspect pedal assembly connector and wiring for damage, corrosion, or water intrusion
- Backprobe APP sensor connector and verify 5V reference, sensor signal, and ground with ignition ON
- Compare APP Sensor 1 and Sensor 2 live data/signals for correlation and smooth response throughout pedal travel
- Check continuity and resistance of signal, reference and ground circuits from sensor connector to ECM with ignition OFF
- Wiggle test harness and connectors while monitoring live data to find intermittent faults
Signal parameters
- 5 V reference supply from ECM to APP sensor (approx. 5.0 V with ignition ON)
- APP Sensor 1 signal voltage typically ~0.5 V at rest (closed) to ~4.5 V at wide open pedal — values vary by model
- Sensor ground ≈ 0 V; very low resistance continuity to vehicle ground
- Two/three-channel pedal sensors should show consistent, proportional voltages; sensor 1 vs sensor 2 correlation expected
- No sudden drops to 0 V or spikes to battery voltage during steady pedal movement
Diagnostic algorithm
- Connect a scan tool. Record P1275 and any other codes, freeze frame data, and live APP sensor channels during key ON and engine off conditions.
- Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
- Backprobe the pedal connector with key ON. Verify the presence of the 5V reference, sensor signal voltage (varies with pedal position), and good ground. Note exact voltages.
- Compare sensor 1 and sensor 2 voltages while gradually pressing the pedal. They should increase smoothly and correlate. If sensor 1 is stuck, jumping, or out of range, suspect sensor or wiring to that channel.
- With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
- If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
- If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
- After repair, clear codes and perform a test drive and re-scan. If code returns and wiring/sensor tested good, consider ECM input circuit failure and consult manufacturer resources before replacing ECM.
- Document findings and any intermittent behaviors; use oscilloscope if available for detailed signal verification on difficult/recurring faults.
Likely causes
- Broken/shorted signal wire between pedal module and ECM
- Corroded terminal or back-pin in pedal connector
- APP sensor internal failure (sensor 1)
- Loss of 5V reference or ground at pedal assembly
- Intermittent fault caused by harness rubbing or pinched wiring
Fault status
Status
APP Sensor 1 circuit fault detected by ECM; MIL may be illuminated. Fault can be stored as active/current or pending depending on occurrence. Throttle system may enter reduced power/limp mode until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
P1275
CADILLAC
P — Powertrain
Accelerator Pedal Position (APP) Sensor 1 Circuit
Views:
UK: 18
EN: 35
RU: 24
AI status
Completed
Completed
100%
Causes
- Damaged or corroded wiring or connector in APP sensor harness
- Open or short to battery voltage or ground on the APP signal or reference wires
- Failed APP sensor (internal fault)
- Poor or intermittent 5V reference or ground from ECM
- Poor connector pins or moisture/contamination in connector
- Faulty ECM (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine power / limp-home mode
- Poor or delayed throttle response, hesitation
- Surging or unexpected throttle behavior
- Possible no-start or stall in severe faults
- Stored or pending DTC; driveability issues related to throttle control
What to check
- Retrieve freeze frame and DTC status with a scan tool; note other related codes
- Visually inspect pedal assembly connector and wiring for damage, corrosion, or water intrusion
- Backprobe APP sensor connector and verify 5V reference, sensor signal, and ground with ignition ON
- Compare APP Sensor 1 and Sensor 2 live data/signals for correlation and smooth response throughout pedal travel
- Check continuity and resistance of signal, reference and ground circuits from sensor connector to ECM with ignition OFF
- Wiggle test harness and connectors while monitoring live data to find intermittent faults
Signal parameters
- 5 V reference supply from ECM to APP sensor (approx. 5.0 V with ignition ON)
- APP Sensor 1 signal voltage typically ~0.5 V at rest (closed) to ~4.5 V at wide open pedal — values vary by model
- Sensor ground ≈ 0 V; very low resistance continuity to vehicle ground
- Two/three-channel pedal sensors should show consistent, proportional voltages; sensor 1 vs sensor 2 correlation expected
- No sudden drops to 0 V or spikes to battery voltage during steady pedal movement
Diagnostic algorithm
- Connect a scan tool. Record P1275 and any other codes, freeze frame data, and live APP sensor channels during key ON and engine off conditions.
- Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
- Backprobe the pedal connector with key ON. Verify the presence of the 5V reference, sensor signal voltage (varies with pedal position), and good ground. Note exact voltages.
- Compare sensor 1 and sensor 2 voltages while gradually pressing the pedal. They should increase smoothly and correlate. If sensor 1 is stuck, jumping, or out of range, suspect sensor or wiring to that channel.
- With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
- If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
- If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
- After repair, clear codes and perform a test drive and re-scan. If code returns and wiring/sensor tested good, consider ECM input circuit failure and consult manufacturer resources before replacing ECM.
- Document findings and any intermittent behaviors; use oscilloscope if available for detailed signal verification on difficult/recurring faults.
Likely causes
- Broken/shorted signal wire between pedal module and ECM
- Corroded terminal or back-pin in pedal connector
- APP sensor internal failure (sensor 1)
- Loss of 5V reference or ground at pedal assembly
- Intermittent fault caused by harness rubbing or pinched wiring
Fault status
Status
APP Sensor 1 circuit fault detected by ECM; MIL may be illuminated. Fault can be stored as active/current or pending depending on occurrence. Throttle system may enter reduced power/limp mode until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
P1275
CHEVROLET
P — Powertrain
Accelerator Pedal Position (APP) Sensor 1 Circuit
Views:
UK: 20
EN: 45
RU: 28
AI status
Completed
Completed
100%
Causes
- Damaged or corroded wiring or connector in APP sensor harness
- Open or short to battery voltage or ground on the APP signal or reference wires
- Failed APP sensor (internal fault)
- Poor or intermittent 5V reference or ground from ECM
- Poor connector pins or moisture/contamination in connector
- Faulty ECM (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine power / limp-home mode
- Poor or delayed throttle response, hesitation
- Surging or unexpected throttle behavior
- Possible no-start or stall in severe faults
- Stored or pending DTC; driveability issues related to throttle control
What to check
- Retrieve freeze frame and DTC status with a scan tool; note other related codes
- Visually inspect pedal assembly connector and wiring for damage, corrosion, or water intrusion
- Backprobe APP sensor connector and verify 5V reference, sensor signal, and ground with ignition ON
- Compare APP Sensor 1 and Sensor 2 live data/signals for correlation and smooth response throughout pedal travel
- Check continuity and resistance of signal, reference and ground circuits from sensor connector to ECM with ignition OFF
- Wiggle test harness and connectors while monitoring live data to find intermittent faults
Signal parameters
- 5 V reference supply from ECM to APP sensor (approx. 5.0 V with ignition ON)
- APP Sensor 1 signal voltage typically ~0.5 V at rest (closed) to ~4.5 V at wide open pedal — values vary by model
- Sensor ground ≈ 0 V; very low resistance continuity to vehicle ground
- Two/three-channel pedal sensors should show consistent, proportional voltages; sensor 1 vs sensor 2 correlation expected
- No sudden drops to 0 V or spikes to battery voltage during steady pedal movement
Diagnostic algorithm
- Connect a scan tool. Record P1275 and any other codes, freeze frame data, and live APP sensor channels during key ON and engine off conditions.
- Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
- Backprobe the pedal connector with key ON. Verify the presence of the 5V reference, sensor signal voltage (varies with pedal position), and good ground. Note exact voltages.
- Compare sensor 1 and sensor 2 voltages while gradually pressing the pedal. They should increase smoothly and correlate. If sensor 1 is stuck, jumping, or out of range, suspect sensor or wiring to that channel.
- With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
- If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
- If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
- After repair, clear codes and perform a test drive and re-scan. If code returns and wiring/sensor tested good, consider ECM input circuit failure and consult manufacturer resources before replacing ECM.
- Document findings and any intermittent behaviors; use oscilloscope if available for detailed signal verification on difficult/recurring faults.
Likely causes
- Broken/shorted signal wire between pedal module and ECM
- Corroded terminal or back-pin in pedal connector
- APP sensor internal failure (sensor 1)
- Loss of 5V reference or ground at pedal assembly
- Intermittent fault caused by harness rubbing or pinched wiring
Fault status
Status
APP Sensor 1 circuit fault detected by ECM; MIL may be illuminated. Fault can be stored as active/current or pending depending on occurrence. Throttle system may enter reduced power/limp mode until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
P1275
CHRYSLER
P — Powertrain
Accelerator Pedal Position (APP) Sensor 1 Circuit
Views:
UK: 20
EN: 46
RU: 26
AI status
Completed
Completed
100%
Causes
- Damaged or corroded wiring or connector in APP sensor harness
- Open or short to battery voltage or ground on the APP signal or reference wires
- Failed APP sensor (internal fault)
- Poor or intermittent 5V reference or ground from ECM
- Poor connector pins or moisture/contamination in connector
- Faulty ECM (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine power / limp-home mode
- Poor or delayed throttle response, hesitation
- Surging or unexpected throttle behavior
- Possible no-start or stall in severe faults
- Stored or pending DTC; driveability issues related to throttle control
What to check
- Retrieve freeze frame and DTC status with a scan tool; note other related codes
- Visually inspect pedal assembly connector and wiring for damage, corrosion, or water intrusion
- Backprobe APP sensor connector and verify 5V reference, sensor signal, and ground with ignition ON
- Compare APP Sensor 1 and Sensor 2 live data/signals for correlation and smooth response throughout pedal travel
- Check continuity and resistance of signal, reference and ground circuits from sensor connector to ECM with ignition OFF
- Wiggle test harness and connectors while monitoring live data to find intermittent faults
Signal parameters
- 5 V reference supply from ECM to APP sensor (approx. 5.0 V with ignition ON)
- APP Sensor 1 signal voltage typically ~0.5 V at rest (closed) to ~4.5 V at wide open pedal — values vary by model
- Sensor ground ≈ 0 V; very low resistance continuity to vehicle ground
- Two/three-channel pedal sensors should show consistent, proportional voltages; sensor 1 vs sensor 2 correlation expected
- No sudden drops to 0 V or spikes to battery voltage during steady pedal movement
Diagnostic algorithm
- Connect a scan tool. Record P1275 and any other codes, freeze frame data, and live APP sensor channels during key ON and engine off conditions.
- Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
- Backprobe the pedal connector with key ON. Verify the presence of the 5V reference, sensor signal voltage (varies with pedal position), and good ground. Note exact voltages.
- Compare sensor 1 and sensor 2 voltages while gradually pressing the pedal. They should increase smoothly and correlate. If sensor 1 is stuck, jumping, or out of range, suspect sensor or wiring to that channel.
- With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
- If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
- If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
- After repair, clear codes and perform a test drive and re-scan. If code returns and wiring/sensor tested good, consider ECM input circuit failure and consult manufacturer resources before replacing ECM.
- Document findings and any intermittent behaviors; use oscilloscope if available for detailed signal verification on difficult/recurring faults.
Likely causes
- Broken/shorted signal wire between pedal module and ECM
- Corroded terminal or back-pin in pedal connector
- APP sensor internal failure (sensor 1)
- Loss of 5V reference or ground at pedal assembly
- Intermittent fault caused by harness rubbing or pinched wiring
Fault status
Status
APP Sensor 1 circuit fault detected by ECM; MIL may be illuminated. Fault can be stored as active/current or pending depending on occurrence. Throttle system may enter reduced power/limp mode until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
P1275
FORD
P — Powertrain
Cylinder #5 High To Low Side Open
Views:
UK: 19
EN: 37
RU: 22
AI status
Completed
Completed
100%
Causes
- Damaged or corroded wiring or connector in APP sensor harness
- Open or short to battery voltage or ground on the APP signal or reference wires
- Failed APP sensor (internal fault)
- Poor or intermittent 5V reference or ground from ECM
- Poor connector pins or moisture/contamination in connector
- Faulty ECM (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine power / limp-home mode
- Poor or delayed throttle response, hesitation
- Surging or unexpected throttle behavior
- Possible no-start or stall in severe faults
- Stored or pending DTC; driveability issues related to throttle control
What to check
- Retrieve freeze frame and DTC status with a scan tool; note other related codes
- Visually inspect pedal assembly connector and wiring for damage, corrosion, or water intrusion
- Backprobe APP sensor connector and verify 5V reference, sensor signal, and ground with ignition ON
- Compare APP Sensor 1 and Sensor 2 live data/signals for correlation and smooth response throughout pedal travel
- Check continuity and resistance of signal, reference and ground circuits from sensor connector to ECM with ignition OFF
- Wiggle test harness and connectors while monitoring live data to find intermittent faults
Signal parameters
- 5 V reference supply from ECM to APP sensor (approx. 5.0 V with ignition ON)
- APP Sensor 1 signal voltage typically ~0.5 V at rest (closed) to ~4.5 V at wide open pedal — values vary by model
- Sensor ground ≈ 0 V; very low resistance continuity to vehicle ground
- Two/three-channel pedal sensors should show consistent, proportional voltages; sensor 1 vs sensor 2 correlation expected
- No sudden drops to 0 V or spikes to battery voltage during steady pedal movement
Diagnostic algorithm
- Connect a scan tool. Record P1275 and any other codes, freeze frame data, and live APP sensor channels during key ON and engine off conditions.
- Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
- Backprobe the pedal connector with key ON. Verify the presence of the 5V reference, sensor signal voltage (varies with pedal position), and good ground. Note exact voltages.
- Compare sensor 1 and sensor 2 voltages while gradually pressing the pedal. They should increase smoothly and correlate. If sensor 1 is stuck, jumping, or out of range, suspect sensor or wiring to that channel.
- With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
- If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
- If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
- After repair, clear codes and perform a test drive and re-scan. If code returns and wiring/sensor tested good, consider ECM input circuit failure and consult manufacturer resources before replacing ECM.
- Document findings and any intermittent behaviors; use oscilloscope if available for detailed signal verification on difficult/recurring faults.
Likely causes
- Broken/shorted signal wire between pedal module and ECM
- Corroded terminal or back-pin in pedal connector
- APP sensor internal failure (sensor 1)
- Loss of 5V reference or ground at pedal assembly
- Intermittent fault caused by harness rubbing or pinched wiring
Fault status
Status
APP Sensor 1 circuit fault detected by ECM; MIL may be illuminated. Fault can be stored as active/current or pending depending on occurrence. Throttle system may enter reduced power/limp mode until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
P1275
GM
P — Powertrain
Accelerator Pedal Position (APP) Sensor 1 Circuit
Views:
UK: 19
EN: 36
RU: 24
AI status
Completed
Completed
100%
Causes
- Damaged or corroded wiring or connector in APP sensor harness
- Open or short to battery voltage or ground on the APP signal or reference wires
- Failed APP sensor (internal fault)
- Poor or intermittent 5V reference or ground from ECM
- Poor connector pins or moisture/contamination in connector
- Faulty ECM (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine power / limp-home mode
- Poor or delayed throttle response, hesitation
- Surging or unexpected throttle behavior
- Possible no-start or stall in severe faults
- Stored or pending DTC; driveability issues related to throttle control
What to check
- Retrieve freeze frame and DTC status with a scan tool; note other related codes
- Visually inspect pedal assembly connector and wiring for damage, corrosion, or water intrusion
- Backprobe APP sensor connector and verify 5V reference, sensor signal, and ground with ignition ON
- Compare APP Sensor 1 and Sensor 2 live data/signals for correlation and smooth response throughout pedal travel
- Check continuity and resistance of signal, reference and ground circuits from sensor connector to ECM with ignition OFF
- Wiggle test harness and connectors while monitoring live data to find intermittent faults
Signal parameters
- 5 V reference supply from ECM to APP sensor (approx. 5.0 V with ignition ON)
- APP Sensor 1 signal voltage typically ~0.5 V at rest (closed) to ~4.5 V at wide open pedal — values vary by model
- Sensor ground ≈ 0 V; very low resistance continuity to vehicle ground
- Two/three-channel pedal sensors should show consistent, proportional voltages; sensor 1 vs sensor 2 correlation expected
- No sudden drops to 0 V or spikes to battery voltage during steady pedal movement
Diagnostic algorithm
- Connect a scan tool. Record P1275 and any other codes, freeze frame data, and live APP sensor channels during key ON and engine off conditions.
- Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
- Backprobe the pedal connector with key ON. Verify the presence of the 5V reference, sensor signal voltage (varies with pedal position), and good ground. Note exact voltages.
- Compare sensor 1 and sensor 2 voltages while gradually pressing the pedal. They should increase smoothly and correlate. If sensor 1 is stuck, jumping, or out of range, suspect sensor or wiring to that channel.
- With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
- If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
- If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
- After repair, clear codes and perform a test drive and re-scan. If code returns and wiring/sensor tested good, consider ECM input circuit failure and consult manufacturer resources before replacing ECM.
- Document findings and any intermittent behaviors; use oscilloscope if available for detailed signal verification on difficult/recurring faults.
Likely causes
- Broken/shorted signal wire between pedal module and ECM
- Corroded terminal or back-pin in pedal connector
- APP sensor internal failure (sensor 1)
- Loss of 5V reference or ground at pedal assembly
- Intermittent fault caused by harness rubbing or pinched wiring
Fault status
Status
APP Sensor 1 circuit fault detected by ECM; MIL may be illuminated. Fault can be stored as active/current or pending depending on occurrence. Throttle system may enter reduced power/limp mode until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
P1275
GMC
P — Powertrain
Accelerator Pedal Position (APP) Sensor 1 Circuit
Views:
UK: 21
EN: 40
RU: 22
AI status
Completed
Completed
100%
Causes
- Damaged or corroded wiring or connector in APP sensor harness
- Open or short to battery voltage or ground on the APP signal or reference wires
- Failed APP sensor (internal fault)
- Poor or intermittent 5V reference or ground from ECM
- Poor connector pins or moisture/contamination in connector
- Faulty ECM (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine power / limp-home mode
- Poor or delayed throttle response, hesitation
- Surging or unexpected throttle behavior
- Possible no-start or stall in severe faults
- Stored or pending DTC; driveability issues related to throttle control
What to check
- Retrieve freeze frame and DTC status with a scan tool; note other related codes
- Visually inspect pedal assembly connector and wiring for damage, corrosion, or water intrusion
- Backprobe APP sensor connector and verify 5V reference, sensor signal, and ground with ignition ON
- Compare APP Sensor 1 and Sensor 2 live data/signals for correlation and smooth response throughout pedal travel
- Check continuity and resistance of signal, reference and ground circuits from sensor connector to ECM with ignition OFF
- Wiggle test harness and connectors while monitoring live data to find intermittent faults
Signal parameters
- 5 V reference supply from ECM to APP sensor (approx. 5.0 V with ignition ON)
- APP Sensor 1 signal voltage typically ~0.5 V at rest (closed) to ~4.5 V at wide open pedal — values vary by model
- Sensor ground ≈ 0 V; very low resistance continuity to vehicle ground
- Two/three-channel pedal sensors should show consistent, proportional voltages; sensor 1 vs sensor 2 correlation expected
- No sudden drops to 0 V or spikes to battery voltage during steady pedal movement
Diagnostic algorithm
- Connect a scan tool. Record P1275 and any other codes, freeze frame data, and live APP sensor channels during key ON and engine off conditions.
- Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
- Backprobe the pedal connector with key ON. Verify the presence of the 5V reference, sensor signal voltage (varies with pedal position), and good ground. Note exact voltages.
- Compare sensor 1 and sensor 2 voltages while gradually pressing the pedal. They should increase smoothly and correlate. If sensor 1 is stuck, jumping, or out of range, suspect sensor or wiring to that channel.
- With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
- If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
- If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
- After repair, clear codes and perform a test drive and re-scan. If code returns and wiring/sensor tested good, consider ECM input circuit failure and consult manufacturer resources before replacing ECM.
- Document findings and any intermittent behaviors; use oscilloscope if available for detailed signal verification on difficult/recurring faults.
Likely causes
- Broken/shorted signal wire between pedal module and ECM
- Corroded terminal or back-pin in pedal connector
- APP sensor internal failure (sensor 1)
- Loss of 5V reference or ground at pedal assembly
- Intermittent fault caused by harness rubbing or pinched wiring
Fault status
Status
APP Sensor 1 circuit fault detected by ECM; MIL may be illuminated. Fault can be stored as active/current or pending depending on occurrence. Throttle system may enter reduced power/limp mode until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
P1275
HUMMER
P — Powertrain
Accelerator Pedal Position (APP) Sensor 1 Circuit
Views:
UK: 8
EN: 17
RU: 10
AI status
Completed
Completed
100%
Causes
- Damaged or corroded wiring or connector in APP sensor harness
- Open or short to battery voltage or ground on the APP signal or reference wires
- Failed APP sensor (internal fault)
- Poor or intermittent 5V reference or ground from ECM
- Poor connector pins or moisture/contamination in connector
- Faulty ECM (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine power / limp-home mode
- Poor or delayed throttle response, hesitation
- Surging or unexpected throttle behavior
- Possible no-start or stall in severe faults
- Stored or pending DTC; driveability issues related to throttle control
What to check
- Retrieve freeze frame and DTC status with a scan tool; note other related codes
- Visually inspect pedal assembly connector and wiring for damage, corrosion, or water intrusion
- Backprobe APP sensor connector and verify 5V reference, sensor signal, and ground with ignition ON
- Compare APP Sensor 1 and Sensor 2 live data/signals for correlation and smooth response throughout pedal travel
- Check continuity and resistance of signal, reference and ground circuits from sensor connector to ECM with ignition OFF
- Wiggle test harness and connectors while monitoring live data to find intermittent faults
Signal parameters
- 5 V reference supply from ECM to APP sensor (approx. 5.0 V with ignition ON)
- APP Sensor 1 signal voltage typically ~0.5 V at rest (closed) to ~4.5 V at wide open pedal — values vary by model
- Sensor ground ≈ 0 V; very low resistance continuity to vehicle ground
- Two/three-channel pedal sensors should show consistent, proportional voltages; sensor 1 vs sensor 2 correlation expected
- No sudden drops to 0 V or spikes to battery voltage during steady pedal movement
Diagnostic algorithm
- Connect a scan tool. Record P1275 and any other codes, freeze frame data, and live APP sensor channels during key ON and engine off conditions.
- Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
- Backprobe the pedal connector with key ON. Verify the presence of the 5V reference, sensor signal voltage (varies with pedal position), and good ground. Note exact voltages.
- Compare sensor 1 and sensor 2 voltages while gradually pressing the pedal. They should increase smoothly and correlate. If sensor 1 is stuck, jumping, or out of range, suspect sensor or wiring to that channel.
- With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
- If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
- If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
- After repair, clear codes and perform a test drive and re-scan. If code returns and wiring/sensor tested good, consider ECM input circuit failure and consult manufacturer resources before replacing ECM.
- Document findings and any intermittent behaviors; use oscilloscope if available for detailed signal verification on difficult/recurring faults.
Likely causes
- Broken/shorted signal wire between pedal module and ECM
- Corroded terminal or back-pin in pedal connector
- APP sensor internal failure (sensor 1)
- Loss of 5V reference or ground at pedal assembly
- Intermittent fault caused by harness rubbing or pinched wiring
Fault status
Status
APP Sensor 1 circuit fault detected by ECM; MIL may be illuminated. Fault can be stored as active/current or pending depending on occurrence. Throttle system may enter reduced power/limp mode until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
P1275
LINCOLN
P — Powertrain
Cylinder 5 High To Low Side Open
Views:
UK: 19
EN: 38
RU: 26
AI status
Completed
Completed
100%
Causes
- Damaged or corroded wiring or connector in APP sensor harness
- Open or short to battery voltage or ground on the APP signal or reference wires
- Failed APP sensor (internal fault)
- Poor or intermittent 5V reference or ground from ECM
- Poor connector pins or moisture/contamination in connector
- Faulty ECM (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine power / limp-home mode
- Poor or delayed throttle response, hesitation
- Surging or unexpected throttle behavior
- Possible no-start or stall in severe faults
- Stored or pending DTC; driveability issues related to throttle control
What to check
- Retrieve freeze frame and DTC status with a scan tool; note other related codes
- Visually inspect pedal assembly connector and wiring for damage, corrosion, or water intrusion
- Backprobe APP sensor connector and verify 5V reference, sensor signal, and ground with ignition ON
- Compare APP Sensor 1 and Sensor 2 live data/signals for correlation and smooth response throughout pedal travel
- Check continuity and resistance of signal, reference and ground circuits from sensor connector to ECM with ignition OFF
- Wiggle test harness and connectors while monitoring live data to find intermittent faults
Signal parameters
- 5 V reference supply from ECM to APP sensor (approx. 5.0 V with ignition ON)
- APP Sensor 1 signal voltage typically ~0.5 V at rest (closed) to ~4.5 V at wide open pedal — values vary by model
- Sensor ground ≈ 0 V; very low resistance continuity to vehicle ground
- Two/three-channel pedal sensors should show consistent, proportional voltages; sensor 1 vs sensor 2 correlation expected
- No sudden drops to 0 V or spikes to battery voltage during steady pedal movement
Diagnostic algorithm
- Connect a scan tool. Record P1275 and any other codes, freeze frame data, and live APP sensor channels during key ON and engine off conditions.
- Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
- Backprobe the pedal connector with key ON. Verify the presence of the 5V reference, sensor signal voltage (varies with pedal position), and good ground. Note exact voltages.
- Compare sensor 1 and sensor 2 voltages while gradually pressing the pedal. They should increase smoothly and correlate. If sensor 1 is stuck, jumping, or out of range, suspect sensor or wiring to that channel.
- With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
- If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
- If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
- After repair, clear codes and perform a test drive and re-scan. If code returns and wiring/sensor tested good, consider ECM input circuit failure and consult manufacturer resources before replacing ECM.
- Document findings and any intermittent behaviors; use oscilloscope if available for detailed signal verification on difficult/recurring faults.
Likely causes
- Broken/shorted signal wire between pedal module and ECM
- Corroded terminal or back-pin in pedal connector
- APP sensor internal failure (sensor 1)
- Loss of 5V reference or ground at pedal assembly
- Intermittent fault caused by harness rubbing or pinched wiring
Fault status
Status
APP Sensor 1 circuit fault detected by ECM; MIL may be illuminated. Fault can be stored as active/current or pending depending on occurrence. Throttle system may enter reduced power/limp mode until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
P1275
MERCURY
P — Powertrain
Cylinder 5 High To Low Side Open
Views:
UK: 22
EN: 42
RU: 25
AI status
Completed
Completed
100%
Causes
- Damaged or corroded wiring or connector in APP sensor harness
- Open or short to battery voltage or ground on the APP signal or reference wires
- Failed APP sensor (internal fault)
- Poor or intermittent 5V reference or ground from ECM
- Poor connector pins or moisture/contamination in connector
- Faulty ECM (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine power / limp-home mode
- Poor or delayed throttle response, hesitation
- Surging or unexpected throttle behavior
- Possible no-start or stall in severe faults
- Stored or pending DTC; driveability issues related to throttle control
What to check
- Retrieve freeze frame and DTC status with a scan tool; note other related codes
- Visually inspect pedal assembly connector and wiring for damage, corrosion, or water intrusion
- Backprobe APP sensor connector and verify 5V reference, sensor signal, and ground with ignition ON
- Compare APP Sensor 1 and Sensor 2 live data/signals for correlation and smooth response throughout pedal travel
- Check continuity and resistance of signal, reference and ground circuits from sensor connector to ECM with ignition OFF
- Wiggle test harness and connectors while monitoring live data to find intermittent faults
Signal parameters
- 5 V reference supply from ECM to APP sensor (approx. 5.0 V with ignition ON)
- APP Sensor 1 signal voltage typically ~0.5 V at rest (closed) to ~4.5 V at wide open pedal — values vary by model
- Sensor ground ≈ 0 V; very low resistance continuity to vehicle ground
- Two/three-channel pedal sensors should show consistent, proportional voltages; sensor 1 vs sensor 2 correlation expected
- No sudden drops to 0 V or spikes to battery voltage during steady pedal movement
Diagnostic algorithm
- Connect a scan tool. Record P1275 and any other codes, freeze frame data, and live APP sensor channels during key ON and engine off conditions.
- Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
- Backprobe the pedal connector with key ON. Verify the presence of the 5V reference, sensor signal voltage (varies with pedal position), and good ground. Note exact voltages.
- Compare sensor 1 and sensor 2 voltages while gradually pressing the pedal. They should increase smoothly and correlate. If sensor 1 is stuck, jumping, or out of range, suspect sensor or wiring to that channel.
- With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
- If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
- If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
- After repair, clear codes and perform a test drive and re-scan. If code returns and wiring/sensor tested good, consider ECM input circuit failure and consult manufacturer resources before replacing ECM.
- Document findings and any intermittent behaviors; use oscilloscope if available for detailed signal verification on difficult/recurring faults.
Likely causes
- Broken/shorted signal wire between pedal module and ECM
- Corroded terminal or back-pin in pedal connector
- APP sensor internal failure (sensor 1)
- Loss of 5V reference or ground at pedal assembly
- Intermittent fault caused by harness rubbing or pinched wiring
Fault status
Status
APP Sensor 1 circuit fault detected by ECM; MIL may be illuminated. Fault can be stored as active/current or pending depending on occurrence. Throttle system may enter reduced power/limp mode until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
P1275
MITSUBISHI
P — Powertrain
Supply pump exchange
Views:
UK: 8
EN: 13
RU: 7
AI status
Completed
Completed
100%
Causes
- Damaged or corroded wiring or connector in APP sensor harness
- Open or short to battery voltage or ground on the APP signal or reference wires
- Failed APP sensor (internal fault)
- Poor or intermittent 5V reference or ground from ECM
- Poor connector pins or moisture/contamination in connector
- Faulty ECM (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine power / limp-home mode
- Poor or delayed throttle response, hesitation
- Surging or unexpected throttle behavior
- Possible no-start or stall in severe faults
- Stored or pending DTC; driveability issues related to throttle control
What to check
- Retrieve freeze frame and DTC status with a scan tool; note other related codes
- Visually inspect pedal assembly connector and wiring for damage, corrosion, or water intrusion
- Backprobe APP sensor connector and verify 5V reference, sensor signal, and ground with ignition ON
- Compare APP Sensor 1 and Sensor 2 live data/signals for correlation and smooth response throughout pedal travel
- Check continuity and resistance of signal, reference and ground circuits from sensor connector to ECM with ignition OFF
- Wiggle test harness and connectors while monitoring live data to find intermittent faults
Signal parameters
- 5 V reference supply from ECM to APP sensor (approx. 5.0 V with ignition ON)
- APP Sensor 1 signal voltage typically ~0.5 V at rest (closed) to ~4.5 V at wide open pedal — values vary by model
- Sensor ground ≈ 0 V; very low resistance continuity to vehicle ground
- Two/three-channel pedal sensors should show consistent, proportional voltages; sensor 1 vs sensor 2 correlation expected
- No sudden drops to 0 V or spikes to battery voltage during steady pedal movement
Diagnostic algorithm
- Connect a scan tool. Record P1275 and any other codes, freeze frame data, and live APP sensor channels during key ON and engine off conditions.
- Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
- Backprobe the pedal connector with key ON. Verify the presence of the 5V reference, sensor signal voltage (varies with pedal position), and good ground. Note exact voltages.
- Compare sensor 1 and sensor 2 voltages while gradually pressing the pedal. They should increase smoothly and correlate. If sensor 1 is stuck, jumping, or out of range, suspect sensor or wiring to that channel.
- With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
- If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
- If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
- After repair, clear codes and perform a test drive and re-scan. If code returns and wiring/sensor tested good, consider ECM input circuit failure and consult manufacturer resources before replacing ECM.
- Document findings and any intermittent behaviors; use oscilloscope if available for detailed signal verification on difficult/recurring faults.
Likely causes
- Broken/shorted signal wire between pedal module and ECM
- Corroded terminal or back-pin in pedal connector
- APP sensor internal failure (sensor 1)
- Loss of 5V reference or ground at pedal assembly
- Intermittent fault caused by harness rubbing or pinched wiring
Fault status
Status
APP Sensor 1 circuit fault detected by ECM; MIL may be illuminated. Fault can be stored as active/current or pending depending on occurrence. Throttle system may enter reduced power/limp mode until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
P1275
OLDSMOBILE
P — Powertrain
Accelerator Pedal Position APP Sensor 1 Circuit
Views:
UK: 23
EN: 33
RU: 22
AI status
Completed
Completed
100%
Causes
- Damaged or corroded wiring or connector in APP sensor harness
- Open or short to battery voltage or ground on the APP signal or reference wires
- Failed APP sensor (internal fault)
- Poor or intermittent 5V reference or ground from ECM
- Poor connector pins or moisture/contamination in connector
- Faulty ECM (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine power / limp-home mode
- Poor or delayed throttle response, hesitation
- Surging or unexpected throttle behavior
- Possible no-start or stall in severe faults
- Stored or pending DTC; driveability issues related to throttle control
What to check
- Retrieve freeze frame and DTC status with a scan tool; note other related codes
- Visually inspect pedal assembly connector and wiring for damage, corrosion, or water intrusion
- Backprobe APP sensor connector and verify 5V reference, sensor signal, and ground with ignition ON
- Compare APP Sensor 1 and Sensor 2 live data/signals for correlation and smooth response throughout pedal travel
- Check continuity and resistance of signal, reference and ground circuits from sensor connector to ECM with ignition OFF
- Wiggle test harness and connectors while monitoring live data to find intermittent faults
Signal parameters
- 5 V reference supply from ECM to APP sensor (approx. 5.0 V with ignition ON)
- APP Sensor 1 signal voltage typically ~0.5 V at rest (closed) to ~4.5 V at wide open pedal — values vary by model
- Sensor ground ≈ 0 V; very low resistance continuity to vehicle ground
- Two/three-channel pedal sensors should show consistent, proportional voltages; sensor 1 vs sensor 2 correlation expected
- No sudden drops to 0 V or spikes to battery voltage during steady pedal movement
Diagnostic algorithm
- Connect a scan tool. Record P1275 and any other codes, freeze frame data, and live APP sensor channels during key ON and engine off conditions.
- Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
- Backprobe the pedal connector with key ON. Verify the presence of the 5V reference, sensor signal voltage (varies with pedal position), and good ground. Note exact voltages.
- Compare sensor 1 and sensor 2 voltages while gradually pressing the pedal. They should increase smoothly and correlate. If sensor 1 is stuck, jumping, or out of range, suspect sensor or wiring to that channel.
- With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
- If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
- If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
- After repair, clear codes and perform a test drive and re-scan. If code returns and wiring/sensor tested good, consider ECM input circuit failure and consult manufacturer resources before replacing ECM.
- Document findings and any intermittent behaviors; use oscilloscope if available for detailed signal verification on difficult/recurring faults.
Likely causes
- Broken/shorted signal wire between pedal module and ECM
- Corroded terminal or back-pin in pedal connector
- APP sensor internal failure (sensor 1)
- Loss of 5V reference or ground at pedal assembly
- Intermittent fault caused by harness rubbing or pinched wiring
Fault status
Status
APP Sensor 1 circuit fault detected by ECM; MIL may be illuminated. Fault can be stored as active/current or pending depending on occurrence. Throttle system may enter reduced power/limp mode until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
P1275
Other
P — Powertrain
Cylinder #5 High To Low Side Open
Views:
UK: 17
EN: 39
RU: 27
AI status
Completed
Completed
100%
Causes
- Damaged or corroded wiring or connector in APP sensor harness
- Open or short to battery voltage or ground on the APP signal or reference wires
- Failed APP sensor (internal fault)
- Poor or intermittent 5V reference or ground from ECM
- Poor connector pins or moisture/contamination in connector
- Faulty ECM (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine power / limp-home mode
- Poor or delayed throttle response, hesitation
- Surging or unexpected throttle behavior
- Possible no-start or stall in severe faults
- Stored or pending DTC; driveability issues related to throttle control
What to check
- Retrieve freeze frame and DTC status with a scan tool; note other related codes
- Visually inspect pedal assembly connector and wiring for damage, corrosion, or water intrusion
- Backprobe APP sensor connector and verify 5V reference, sensor signal, and ground with ignition ON
- Compare APP Sensor 1 and Sensor 2 live data/signals for correlation and smooth response throughout pedal travel
- Check continuity and resistance of signal, reference and ground circuits from sensor connector to ECM with ignition OFF
- Wiggle test harness and connectors while monitoring live data to find intermittent faults
Signal parameters
- 5 V reference supply from ECM to APP sensor (approx. 5.0 V with ignition ON)
- APP Sensor 1 signal voltage typically ~0.5 V at rest (closed) to ~4.5 V at wide open pedal — values vary by model
- Sensor ground ≈ 0 V; very low resistance continuity to vehicle ground
- Two/three-channel pedal sensors should show consistent, proportional voltages; sensor 1 vs sensor 2 correlation expected
- No sudden drops to 0 V or spikes to battery voltage during steady pedal movement
Diagnostic algorithm
- Connect a scan tool. Record P1275 and any other codes, freeze frame data, and live APP sensor channels during key ON and engine off conditions.
- Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
- Backprobe the pedal connector with key ON. Verify the presence of the 5V reference, sensor signal voltage (varies with pedal position), and good ground. Note exact voltages.
- Compare sensor 1 and sensor 2 voltages while gradually pressing the pedal. They should increase smoothly and correlate. If sensor 1 is stuck, jumping, or out of range, suspect sensor or wiring to that channel.
- With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
- If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
- If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
- After repair, clear codes and perform a test drive and re-scan. If code returns and wiring/sensor tested good, consider ECM input circuit failure and consult manufacturer resources before replacing ECM.
- Document findings and any intermittent behaviors; use oscilloscope if available for detailed signal verification on difficult/recurring faults.
Likely causes
- Broken/shorted signal wire between pedal module and ECM
- Corroded terminal or back-pin in pedal connector
- APP sensor internal failure (sensor 1)
- Loss of 5V reference or ground at pedal assembly
- Intermittent fault caused by harness rubbing or pinched wiring
Fault status
Status
APP Sensor 1 circuit fault detected by ECM; MIL may be illuminated. Fault can be stored as active/current or pending depending on occurrence. Throttle system may enter reduced power/limp mode until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
Similar codes
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Code
P1275
RAM
P — Powertrain
A/C Clutch Control Circuit 2 Overcurrent
Views:
UK: 2
EN: 4
RU: 1
AI status
Completed
Completed
100%
Causes
- Damaged or corroded wiring or connector in APP sensor harness
- Open or short to battery voltage or ground on the APP signal or reference wires
- Failed APP sensor (internal fault)
- Poor or intermittent 5V reference or ground from ECM
- Poor connector pins or moisture/contamination in connector
- Faulty ECM (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine power / limp-home mode
- Poor or delayed throttle response, hesitation
- Surging or unexpected throttle behavior
- Possible no-start or stall in severe faults
- Stored or pending DTC; driveability issues related to throttle control
What to check
- Retrieve freeze frame and DTC status with a scan tool; note other related codes
- Visually inspect pedal assembly connector and wiring for damage, corrosion, or water intrusion
- Backprobe APP sensor connector and verify 5V reference, sensor signal, and ground with ignition ON
- Compare APP Sensor 1 and Sensor 2 live data/signals for correlation and smooth response throughout pedal travel
- Check continuity and resistance of signal, reference and ground circuits from sensor connector to ECM with ignition OFF
- Wiggle test harness and connectors while monitoring live data to find intermittent faults
Signal parameters
- 5 V reference supply from ECM to APP sensor (approx. 5.0 V with ignition ON)
- APP Sensor 1 signal voltage typically ~0.5 V at rest (closed) to ~4.5 V at wide open pedal — values vary by model
- Sensor ground ≈ 0 V; very low resistance continuity to vehicle ground
- Two/three-channel pedal sensors should show consistent, proportional voltages; sensor 1 vs sensor 2 correlation expected
- No sudden drops to 0 V or spikes to battery voltage during steady pedal movement
Diagnostic algorithm
- Connect a scan tool. Record P1275 and any other codes, freeze frame data, and live APP sensor channels during key ON and engine off conditions.
- Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
- Backprobe the pedal connector with key ON. Verify the presence of the 5V reference, sensor signal voltage (varies with pedal position), and good ground. Note exact voltages.
- Compare sensor 1 and sensor 2 voltages while gradually pressing the pedal. They should increase smoothly and correlate. If sensor 1 is stuck, jumping, or out of range, suspect sensor or wiring to that channel.
- With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
- If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
- If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
- After repair, clear codes and perform a test drive and re-scan. If code returns and wiring/sensor tested good, consider ECM input circuit failure and consult manufacturer resources before replacing ECM.
- Document findings and any intermittent behaviors; use oscilloscope if available for detailed signal verification on difficult/recurring faults.
Likely causes
- Broken/shorted signal wire between pedal module and ECM
- Corroded terminal or back-pin in pedal connector
- APP sensor internal failure (sensor 1)
- Loss of 5V reference or ground at pedal assembly
- Intermittent fault caused by harness rubbing or pinched wiring
Fault status
Status
APP Sensor 1 circuit fault detected by ECM; MIL may be illuminated. Fault can be stored as active/current or pending depending on occurrence. Throttle system may enter reduced power/limp mode until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
Similar codes
Your experience will help others
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Code
P1275
SATURN
P — Powertrain
Accelerator Pedal Position APP Sensor 1 Circuit
Views:
UK: 22
EN: 52
RU: 30
AI status
Completed
Completed
100%
Causes
- Damaged or corroded wiring or connector in APP sensor harness
- Open or short to battery voltage or ground on the APP signal or reference wires
- Failed APP sensor (internal fault)
- Poor or intermittent 5V reference or ground from ECM
- Poor connector pins or moisture/contamination in connector
- Faulty ECM (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine power / limp-home mode
- Poor or delayed throttle response, hesitation
- Surging or unexpected throttle behavior
- Possible no-start or stall in severe faults
- Stored or pending DTC; driveability issues related to throttle control
What to check
- Retrieve freeze frame and DTC status with a scan tool; note other related codes
- Visually inspect pedal assembly connector and wiring for damage, corrosion, or water intrusion
- Backprobe APP sensor connector and verify 5V reference, sensor signal, and ground with ignition ON
- Compare APP Sensor 1 and Sensor 2 live data/signals for correlation and smooth response throughout pedal travel
- Check continuity and resistance of signal, reference and ground circuits from sensor connector to ECM with ignition OFF
- Wiggle test harness and connectors while monitoring live data to find intermittent faults
Signal parameters
- 5 V reference supply from ECM to APP sensor (approx. 5.0 V with ignition ON)
- APP Sensor 1 signal voltage typically ~0.5 V at rest (closed) to ~4.5 V at wide open pedal — values vary by model
- Sensor ground ≈ 0 V; very low resistance continuity to vehicle ground
- Two/three-channel pedal sensors should show consistent, proportional voltages; sensor 1 vs sensor 2 correlation expected
- No sudden drops to 0 V or spikes to battery voltage during steady pedal movement
Diagnostic algorithm
- Connect a scan tool. Record P1275 and any other codes, freeze frame data, and live APP sensor channels during key ON and engine off conditions.
- Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
- Backprobe the pedal connector with key ON. Verify the presence of the 5V reference, sensor signal voltage (varies with pedal position), and good ground. Note exact voltages.
- Compare sensor 1 and sensor 2 voltages while gradually pressing the pedal. They should increase smoothly and correlate. If sensor 1 is stuck, jumping, or out of range, suspect sensor or wiring to that channel.
- With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
- If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
- If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
- After repair, clear codes and perform a test drive and re-scan. If code returns and wiring/sensor tested good, consider ECM input circuit failure and consult manufacturer resources before replacing ECM.
- Document findings and any intermittent behaviors; use oscilloscope if available for detailed signal verification on difficult/recurring faults.
Likely causes
- Broken/shorted signal wire between pedal module and ECM
- Corroded terminal or back-pin in pedal connector
- APP sensor internal failure (sensor 1)
- Loss of 5V reference or ground at pedal assembly
- Intermittent fault caused by harness rubbing or pinched wiring
Fault status
Status
APP Sensor 1 circuit fault detected by ECM; MIL may be illuminated. Fault can be stored as active/current or pending depending on occurrence. Throttle system may enter reduced power/limp mode until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
Similar codes
Your experience will help others
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Was this AI description helpful?
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