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P2138 GMC Code - Accelerator Pedal Position Sensor 1-2 Correlation

Quick Answer

The P2138 GMC diagnostic trouble code indicates a problem with the correlation between the Accelerator Pedal Position Sensor 1 and Sensor 2. Common causes include Faulty Accelerator Pedal Position Sensor 1 or Sensor 2, Wiring or connector issues, Corrosion or damage to sensor terminals. 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
P2138 GMC indicates Accelerator Pedal Position Sensor 1-2 Correlation.
Common causes
Common causes include Faulty Accelerator Pedal Position Sensor 1 or Sensor 2, Wiring or connector issues, Corrosion or damage to sensor terminals.
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 Aug 19, 2024
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Code P2138 GMC Description

The P2138 GMC diagnostic trouble code indicates a problem with the correlation between the Accelerator Pedal Position Sensor 1 and Sensor 2. These sensors are responsible for monitoring the position of the accelerator pedal and sending signals to the Engine Control Module (ECM) to adjust fuel delivery and engine performance accordingly. When these sensors do not correlate correctly, it can lead to issues with engine performance, drivability, and overall vehicle operation.

OBDII Code P2138 GMC - Accelerator Pedal Position Sensor 1-2 Correlation
P2138 GMC Code - Accelerator Pedal Position Sensor 1-2 Correlation

Common Causes of P2138 GMC

  1. Faulty Accelerator Pedal Position Sensor 1 or Sensor 2
  2. Wiring or connector issues
  3. Corrosion or damage to sensor terminals
  4. ECM malfunction
  5. Poor electrical connections

Symptoms of P2138 GMC

  1. Reduced acceleration
  2. Hesitation or surging while driving
  3. Rough idling
  4. Stalling
  5. Reduced power mode activation

How to Fix P2138 GMC

  1. Inspect and test the Accelerator Pedal Position Sensor 1 and Sensor 2.
  2. Check for any wiring or connector issues and repair as necessary.
  3. Clean or replace sensor terminals if corroded or damaged.
  4. Reset the ECM and clear the trouble code.
  5. Test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P2138 GMC

The typical repair costs for addressing a P2138 GMC code can vary depending on the specific cause of the issue. Parts such as new sensors or wiring components may range from $50 to $200, while labor costs can range from $100 to $300. Overall, the total repair cost could fall between $150 and $500, but it is advisable to check with local auto repair shops for accurate pricing based on your vehicle's make and model. Labor rates typically range from $80 to $150 per hour.

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Tech Notes for P2138 GMC





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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.

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