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P1271 GMC Code - Accelerator Pedal Position Sensor 1-2 Correlation

Quick Answer

The P1271 diagnostic trouble code for GMC vehicles specifically refers to the Accelerator Pedal Position Sensor 1-2 Correlation. Common causes include Faulty accelerator pedal position sensor, Wiring harness issues or electrical connection problems, ECM malfunction or software issues. 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
P1271 GMC indicates Accelerator Pedal Position Sensor 1-2 Correlation.
Common causes
Common causes include Faulty accelerator pedal position sensor, Wiring harness issues or electrical connection problems, ECM malfunction or software issues.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1271 GMC Description

The P1271 diagnostic trouble code for GMC vehicles specifically refers to the Accelerator Pedal Position Sensor 1-2 Correlation. This code indicates that there is a discrepancy or correlation issue between the signals sent by the two accelerator pedal position sensors in the vehicle. In modern vehicles, there are typically two accelerator pedal position sensors for redundancy and safety purposes. These sensors are responsible for sending signals to the engine control module (ECM) to determine the appropriate throttle position based on the driver's input.

OBDII Code P1271 GMC - Accelerator Pedal Position Sensor 1-2 Correlation
P1271 GMC Code - Accelerator Pedal Position Sensor 1-2 Correlation

Common Causes of P1271 GMC

  1. Faulty accelerator pedal position sensor
  2. Wiring harness issues or electrical connection problems
  3. ECM malfunction or software issues
  4. Mechanical issues with the throttle body
  5. Environmental factors such as moisture or corrosion affecting sensor performance

Symptoms of P1271 GMC

  1. Check engine light illuminated
  2. Hesitation or lack of response when pressing the accelerator pedal
  3. Rough idle or erratic engine behavior
  4. Poor acceleration or loss of power
  5. Engine stalling or difficulty starting

How to Fix P1271 GMC

  1. Diagnose the issue using a scan tool to retrieve the trouble code and analyze the accelerator pedal position sensor signals.
  2. Inspect the wiring harness and electrical connections for any damage or corrosion. Repair or replace as needed.
  3. Test the accelerator pedal position sensors for proper functionality. Replace any faulty sensors.
  4. Clear the trouble code from the ECM memory and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnosis may be required to identify any underlying issues with the ECM or throttle body.

Cost to Fix P1271 GMC

The typical repair costs for addressing the P1271 code can vary depending on the specific cause of the issue. In general, replacing a faulty accelerator pedal position sensor can range from $100 to $300, including parts and labor. Additional costs may apply if wiring repairs or ECM diagnostics are necessary. It is advisable to consult with a certified mechanic or auto repair shop for a more accurate estimate based on your vehicle's make and model. Keep in mind that labor rates can vary, so it's recommended to inquire about pricing upfront.

When is the Code Detected?

The Engine Control Module (ECM) compared the signal from both Accelerator Pedal Position (APP) sensors and detected a voltage difference.

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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 P1271 GMC Code

No Frequently Asked Questions about P1271 GMC Code found.

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  • No parts replaced starting coming up with reduced engine power light with no effect on drivability then all of a sudden. Same light came on and I couldn't accelerate. I'm going to try cleaning the throttle body after that no idea. Please help!

    Reply to Comment

  • Cleaning the Throttle Body is a good start.
    Let me check if there is more information. What model and year is your vehicle?

    Reply to Comment

  • 2002 Chevy Trailblazer LT thank you so much for your reply

    Reply to Comment

  • Please doble check the code number, there is no P1271 code listed in the factory service manual.
    Unfortunately there are many things that can set the "Reduce Engine Power" warning light. I recommend starting by checking for codes and if possible use high octane gas for a couple of weeks.

    Reply to Comment

  • Thank you so much I'll have access to a code reader tomorrow. My girlfriend and I have been having car issues since November with different cars. We Must Have Spent A Couple Grand we're riding a fine line. It's been extremely stressful and just want it over with. Thank you so much for your help.

    Reply to Comment