Toggle Side Panel

Shopping Cart

No products in the basket.

Shopping Cart

No products in the basket.

Close search
Home / DTC / P1275 — Accelerator Pedal Position (APP) Sensor 1 Circuit

P1275 — Accelerator Pedal Position (APP) Sensor 1 Circuit

Detailed page for trouble code P1275.

34,405codes
59brands
11,914generic
22,491specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
Reset
Code

P1275

BUICK P — Powertrain

Accelerator Pedal Position (APP) Sensor 1 Circuit

Brand: BUICK
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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.
  2. Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
  3. 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.
  4. 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.
  5. With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
  6. If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
  7. If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
  8. 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.
  9. 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

P0120 P0121 P0122 P0123 P0220 P0221
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1275

CADILLAC P — Powertrain

Accelerator Pedal Position (APP) Sensor 1 Circuit

Brand: CADILLAC
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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.
  2. Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
  3. 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.
  4. 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.
  5. With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
  6. If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
  7. If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
  8. 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.
  9. 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

P0120 P0121 P0122 P0123 P0220 P0221
169

Browse 169 CADILLAC manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

CADILLAC

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1275

CHEVROLET P — Powertrain

Accelerator Pedal Position (APP) Sensor 1 Circuit

Brand: CHEVROLET
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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.
  2. Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
  3. 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.
  4. 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.
  5. With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
  6. If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
  7. If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
  8. 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.
  9. 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

P0120 P0121 P0122 P0123 P0220 P0221
456

Browse 456 CHEVROLET manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

CHEVROLET

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1275

CHRYSLER P — Powertrain

Accelerator Pedal Position (APP) Sensor 1 Circuit

Brand: CHRYSLER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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.
  2. Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
  3. 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.
  4. 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.
  5. With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
  6. If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
  7. If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
  8. 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.
  9. 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

P0120 P0121 P0122 P0123 P0220 P0221
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1275

FORD P — Powertrain

Cylinder #5 High To Low Side Open

Brand: FORD
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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.
  2. Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
  3. 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.
  4. 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.
  5. With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
  6. If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
  7. If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
  8. 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.
  9. 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

P0120 P0121 P0122 P0123 P0220 P0221
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1275

GM P — Powertrain

Accelerator Pedal Position (APP) Sensor 1 Circuit

Brand: GM
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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.
  2. Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
  3. 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.
  4. 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.
  5. With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
  6. If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
  7. If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
  8. 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.
  9. 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

P0120 P0121 P0122 P0123 P0220 P0221
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1275

GMC P — Powertrain

Accelerator Pedal Position (APP) Sensor 1 Circuit

Brand: GMC
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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.
  2. Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
  3. 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.
  4. 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.
  5. With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
  6. If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
  7. If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
  8. 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.
  9. 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

P0120 P0121 P0122 P0123 P0220 P0221
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1275

HUMMER P — Powertrain

Accelerator Pedal Position (APP) Sensor 1 Circuit

Brand: HUMMER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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.
  2. Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
  3. 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.
  4. 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.
  5. With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
  6. If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
  7. If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
  8. 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.
  9. 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

P0120 P0121 P0122 P0123 P0220 P0221
Repair manuals

Manual library for HUMMER

138

Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HUMMER

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1275

LINCOLN P — Powertrain

Cylinder 5 High To Low Side Open

Brand: LINCOLN
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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.
  2. Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
  3. 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.
  4. 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.
  5. With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
  6. If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
  7. If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
  8. 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.
  9. 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

P0120 P0121 P0122 P0123 P0220 P0221
166

Browse 166 LINCOLN manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LINCOLN

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1275

MERCURY P — Powertrain

Cylinder 5 High To Low Side Open

Brand: MERCURY
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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.
  2. Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
  3. 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.
  4. 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.
  5. With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
  6. If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
  7. If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
  8. 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.
  9. 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

P0120 P0121 P0122 P0123 P0220 P0221
296

Browse 296 MERCURY manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MERCURY

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1275

MITSUBISHI P — Powertrain

Supply pump exchange

Brand: MITSUBISHI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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.
  2. Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
  3. 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.
  4. 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.
  5. With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
  6. If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
  7. If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
  8. 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.
  9. 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

P0120 P0121 P0122 P0123 P0220 P0221
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1275

OLDSMOBILE P — Powertrain

Accelerator Pedal Position APP Sensor 1 Circuit

Brand: OLDSMOBILE
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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.
  2. Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
  3. 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.
  4. 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.
  5. With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
  6. If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
  7. If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
  8. 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.
  9. 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

P0120 P0121 P0122 P0123 P0220 P0221
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1275

Other P — Powertrain

Cylinder #5 High To Low Side Open

Brand: Other
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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.
  2. Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
  3. 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.
  4. 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.
  5. With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
  6. If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
  7. If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
  8. 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.
  9. 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

P0120 P0121 P0122 P0123 P0220 P0221
8,876

The library contains 8,876 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.

ALFA ROMEO
89
AUDI
1,243
BMW
479
CADILLAC
168
CHEVROLET
456
DAEWOO
75
FIAT
26
GENESIS
207
HUMMER
138
HYUNDAI
371
ISUZU
86
LAND ROVER
320
LEXUS
280
LINCOLN
166
MERCEDES-BENZ
856
MERCURY
296
MITSUBISHI
406
PORSCHE
136
TESLA
58
TOYOTA
2,042
TRIUMPH
131
VOLKSWAGEN
626
VOLVO
221
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1275

RAM P — Powertrain

A/C Clutch Control Circuit 2 Overcurrent

Brand: RAM
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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.
  2. Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
  3. 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.
  4. 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.
  5. With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
  6. If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
  7. If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
  8. 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.
  9. 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

P0120 P0121 P0122 P0123 P0220 P0221
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1275

SATURN P — Powertrain

Accelerator Pedal Position APP Sensor 1 Circuit

Brand: SATURN
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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.
  2. Perform a visual inspection of the accelerator pedal/module connector and harness for chafing, pin damage, corrosion or moisture. Repair any visible damage.
  3. 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.
  4. 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.
  5. With ignition OFF, check continuity between pedal connector pins and ECM pins for signal, reference and ground. Repair open/shorted wiring as required.
  6. If wiring checks good but signal is incorrect, unplugging the pedal and inspecting connector pins often reveals corrosion; repair or replace connector/pigtail.
  7. If wiring and connector are good but the sensor signal remains faulty, replace the APP sensor/pedal module.
  8. 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.
  9. 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

P0120 P0121 P0122 P0123 P0220 P0221
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

Report

Harassment or bullying behavior
Contains mature or sensitive content
Contains misleading or false information
Contains abusive or derogatory content
Contains spam, fake content or potential malware

Block Member?

Please confirm you want to block this member.

You will no longer be able to:

  • See blocked member's posts
  • Mention this member in posts
  • Invite this member to groups
  • Message this member
  • Add this member as a connection

Please note: This action will also remove this member from your connections and send a report to the site admin. Please allow a few minutes for this process to complete.

Report

You have already reported this .