Engine-CodesGMC – P1125 GMC

P1125 GMC Code - Accelerator Pedal Position Sensor Fault

Quick Answer

The P1125 GMC code indicates a fault with the Accelerator Pedal Position Sensor (APPS) in the vehicle. Common causes include Faulty accelerator pedal position sensor, Wiring or connector issues, Corrosion or damage to sensor components. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1125 GMC indicates Accelerator Pedal Position Sensor Fault.
Common causes
Common causes include Faulty accelerator pedal position sensor, Wiring or connector issues, Corrosion or damage to sensor components.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Table of contents Created and updated by William Orellana on Aug 30, 2024
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Code P1125 GMC Description

The P1125 GMC code indicates a fault with the Accelerator Pedal Position Sensor (APPS) in the vehicle. This sensor is responsible for detecting the position of the accelerator pedal and sending this information to the engine control module to adjust the throttle accordingly. When this sensor malfunctions, it can lead to issues with acceleration, fuel efficiency, and overall engine performance.

OBDII Code P1125 GMC - Accelerator Pedal Position Sensor Fault
P1125 GMC Code - Accelerator Pedal Position Sensor Fault

Common Causes of P1125 GMC

  1. Faulty accelerator pedal position sensor.
  2. Wiring or connector issues.
  3. Corrosion or damage to sensor components.
  4. Electronic control module (ECM) failure.
  5. Environmental factors such as moisture or debris affecting sensor operation.

Symptoms of P1125 GMC

  1. Loss of power or hesitation during acceleration.
  2. Engine stalling or rough idling.
  3. Poor fuel efficiency.
  4. Illumination of the Check Engine Light.
  5. Difficulty maintaining a constant speed.

How to Fix P1125 GMC

  1. Diagnose the issue by connecting a scan tool to retrieve the specific code and verify the fault.
  2. Inspect the wiring and connectors associated with the accelerator pedal position sensor for any damage or corrosion.
  3. Test the sensor itself for proper functionality or replace it if necessary.
  4. Clear the diagnostic trouble codes and reset the system to see if the issue is resolved.
  5. Test drive the vehicle to confirm that the symptoms have been eliminated.

Cost to Fix P1125 GMC

The cost of repairing a fault with the Accelerator Pedal Position Sensor can vary depending on the specific issue and the vehicle's make and model. On average, the parts for this repair can range from $100 to $300, while labor costs can be anywhere from $100 to $200. This estimate does not include the cost of diagnostic testing, which may incur additional charges. It's recommended to consult with a qualified mechanic or dealership for a more accurate cost estimate based on your individual circumstances.

When is the Code Detected?

The Powertrain Control Module (PCM) detects that the difference between Accelerator Pedal Position (APP) sensor 1 and APP sensor 2 is more than the predicted value.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1125 GMC Code

1. What are the common symptoms of OBDII code P1125 GMC (Accelerator Pedal Position Sensor Fault)?

- Common symptoms include reduced engine power, hesitation or stalling when accelerating, and the illumination of the Check Engine light.

2. What are the possible causes of OBDII code P1125 GMC?

- The code P1125 GMC is typically caused by a faulty accelerator pedal position sensor, wiring issues, or a problem with the throttle body.

3. How can I diagnose the OBDII code P1125 GMC?

- Diagnosis usually involves using a scan tool to read the code, checking the wiring and connections related to the accelerator pedal position sensor, and testing the sensor's functionality.

4. Can I continue driving my vehicle with OBDII code P1125 GMC?

- It is not recommended to drive your vehicle with this code present, as it can lead to unsafe driving conditions and potential further damage to the engine.

5. What are some repair tips for addressing OBDII code P1125 GMC?

- Repair tips include inspecting and cleaning the throttle body, checking and repairing any damaged wiring, and replacing the accelerator pedal position sensor if necessary.

6. How much does it cost to repair OBDII code P1125 GMC?

- The cost of repairing this code can vary depending on the underlying issue, but it may range from $100 to $300 for parts and labor.

7. Can I reset the OBDII code P1125 GMC myself?

- You can reset the code using an OBDII scan tool, but it is important to address the underlying issue causing the fault code to prevent it from coming back.

8. How urgent is it to address OBDII code P1125 GMC?

- It is important to address this code promptly to prevent further engine damage and ensure safe driving conditions.

9. Are there any recalls related to OBDII code P1125 GMC?

- It is advisable to check with your local GMC dealership or the National Highway Traffic Safety Administration (NHTSA) for any recalls related to this code.

10. Can a DIY enthusiast repair OBDII code P1125 GMC?

- Depending on your skill level and access to tools, a DIY enthusiast may be able to address this code by following repair guides and instructions, but professional help is recommended if unsure.

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