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P2138 2014 GMC Sierra Code - Accelerator Pedal Position Sensor 1-2 Correlation

Quick Answer

The P2138 diagnostic trouble code (DTC) for a 2014 GMC Sierra refers to a problem with the Accelerator Pedal Position Sensor 1-2 Correlation. Common causes include Faulty accelerator pedal position sensors, Wiring or connector issues in the accelerator pedal assembly, ECM software or hardware malfunction. 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 2014 GMC Sierra indicates Accelerator Pedal Position Sensor 1-2 Correlation.
Common causes
Common causes include Faulty accelerator pedal position sensors, Wiring or connector issues in the accelerator pedal assembly, ECM software or hardware malfunction.
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 11, 2024
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Code P2138 2014 GMC Sierra Description

The P2138 diagnostic trouble code (DTC) for a 2014 GMC Sierra refers to a problem with the Accelerator Pedal Position Sensor 1-2 Correlation. This code indicates that there is a discrepancy between the signals being sent by the two accelerator pedal position sensors in the vehicle. The Accelerator Pedal Position Sensor (APPS) is a crucial component that helps control the throttle body's operation based on the driver's input. When the two sensors do not correlate properly, it can lead to issues with the engine's performance and overall drivability of the vehicle.

OBDII Code P2138 2014 GMC Sierra - Accelerator Pedal Position Sensor 1-2 Correlation
P2138 2014 GMC Sierra Code - Accelerator Pedal Position Sensor 1-2 Correlation

Common Causes of P2138 2014 GMC Sierra

  1. Faulty accelerator pedal position sensors.
  2. Wiring or connector issues in the accelerator pedal assembly.
  3. ECM software or hardware malfunction.
  4. Throttle body issues causing a discrepancy in signals.
  5. Environmental factors such as moisture or corrosion affecting sensor performance.

Symptoms of P2138 2014 GMC Sierra

  1. Reduced acceleration or lack of response when pressing the accelerator pedal.
  2. Engine stalling or rough idling.
  3. Check Engine Light illuminated on the dashboard.
  4. Vehicle going into limp mode, limiting speed and power.
  5. Difficulty maintaining a constant speed while driving.

How to Fix P2138 2014 GMC Sierra

  1. Begin by diagnosing the issue with a scan tool to confirm the P2138 code and identify the specific cause of the problem.
  2. Inspect the accelerator pedal position sensors and wiring for any visible damage or corrosion, repairing or replacing as necessary.
  3. Check the throttle body for any obstructions or malfunctions that could be affecting the sensor signals.
  4. Clear the DTC and perform a test drive to ensure the issue has been resolved and the symptoms have disappeared.
  5. If the problem persists, consider seeking professional help from a certified mechanic or dealership for further diagnosis and repair.

Cost to Fix P2138 2014 GMC Sierra

The typical repair costs for addressing the P2138 code on a 2014 GMC Sierra can range from $200 to $500, including parts and labor. However, it is essential to note that the specific diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. Rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less. It is advisable to contact local auto repair shops for a more accurate estimate based on your specific situation.

What does this mean?

Tech Notes for P2138 2014 GMC Sierra









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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 P2138 2014 GMC Sierra Code

1. What does OBDII code P2138 on a 2014 GMC Sierra mean?

The P2138 code indicates an issue with the correlation between accelerator pedal position sensors 1 and 2 in a 2014 GMC Sierra.

2. What are the common symptoms of OBDII code P2138 in a 2014 GMC Sierra?

Common symptoms include reduced engine power, hesitation when accelerating, illuminated Check Engine Light, and potential difficulty maintaining speed.

3. What are the possible causes of OBDII code P2138 in a 2014 GMC Sierra?

Potential causes of P2138 include a faulty accelerator pedal position sensor, wiring issues, sensor calibration problems, or a malfunction in the engine control module.

4. How can I diagnose the OBDII code P2138 on my 2014 GMC Sierra?

Diagnosing P2138 typically involves using a scan tool to retrieve the code, checking the wiring and connectors related to the accelerator pedal position sensors, and testing the sensors themselves for proper operation.

5. Can I drive my 2014 GMC Sierra with OBDII code P2138?

It is not recommended to drive your vehicle with code P2138 as it can lead to unsafe driving conditions and potential further damage to the vehicle.

6. How can I repair OBDII code P2138 on a 2014 GMC Sierra?

Repairing P2138 may involve replacing the faulty accelerator pedal position sensor, repairing any damaged wiring, recalibrating the sensors, or reprogramming the engine control module.

7. Is it possible to clear the OBDII code P2138 on a 2014 GMC Sierra without fixing the issue?

Clearing the code without addressing the underlying problem may temporarily turn off the Check Engine Light, but the issue causing P2138 will likely persist and trigger the code again.

8. Can a DIY enthusiast fix OBDII code P2138 on a 2014 GMC Sierra?

Depending on your skill level and access to tools, DIY enthusiasts may be able to address simple causes of P2138 like sensor replacement, but more complex issues may require professional assistance.

9. How much does it cost to repair OBDII code P2138 on a 2014 GMC Sierra?

The cost of repairing P2138 can vary depending on the specific cause of the issue, but it may range from a few hundred to a thousand dollars, including parts and labor.

10. How can I prevent OBDII code P2138 from occurring in the future on my 2014 GMC Sierra?

To prevent P2138, it's important to perform regular maintenance checks, address any accelerator pedal-related issues promptly, and avoid driving habits that could strain the sensors.

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