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Engine-Codes – GMC – P2122 2015 GMC Sierra

P2122 2015 GMC Sierra Code - Accelerator Pedal Position Sensor 1 Circuit Low Voltage

Quick Answer

The P2122 diagnostic trouble code (DTC) for the 2015 GMC Sierra relates to the Accelerator Pedal Position Sensor 1 Circuit Low Voltage. Common causes include Damaged or corroded wiring in the accelerator pedal position sensor circuit, A faulty accelerator pedal position sensor, Malfunctioning engine control module (ECM). 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
P2122 2015 GMC Sierra indicates Accelerator Pedal Position Sensor 1 Circuit Low Voltage.
Common causes
Common causes include Damaged or corroded wiring in the accelerator pedal position sensor circuit, A faulty accelerator pedal position sensor, Malfunctioning engine control module (ECM).
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 P2122 2015 GMC Sierra Description

The P2122 diagnostic trouble code (DTC) for the 2015 GMC Sierra relates to the Accelerator Pedal Position Sensor 1 Circuit Low Voltage. This code indicates that there is a low voltage signal detected from the accelerator pedal position sensor 1 circuit. The accelerator pedal position sensor is a vital component of the electronic throttle control system, responsible for detecting the position of the accelerator pedal and sending this information to the engine control module (ECM). The ECM uses this data to determine the appropriate throttle opening for the engine.

OBDII Code P2122 2015 GMC Sierra - Accelerator Pedal Position Sensor 1 Circuit Low Voltage
P2122 2015 GMC Sierra Code - Accelerator Pedal Position Sensor 1 Circuit Low Voltage

Common Causes of P2122 2015 GMC Sierra

  1. Damaged or corroded wiring in the accelerator pedal position sensor circuit.
  2. A faulty accelerator pedal position sensor.
  3. Malfunctioning engine control module (ECM).
  4. Poor electrical connection between components.
  5. Water or moisture intrusion affecting sensor operation.

Symptoms of P2122 2015 GMC Sierra

  1. Hesitation or lack of response when pressing the accelerator pedal.
  2. Rough idling or engine misfires.
  3. Reduced engine power or acceleration.
  4. Illumination of the Check Engine Light.
  5. Stalling or difficulty starting the engine.

How to Fix P2122 2015 GMC Sierra

  1. Begin by diagnosing the issue using a scan tool to retrieve the specific trouble code (P2122) and pinpoint the source of the problem.
  2. Inspect the wiring harness for any signs of damage, corrosion, or loose connections. Repair or replace any faulty wiring as needed.
  3. Test the accelerator pedal position sensor using a multimeter to ensure it is functioning properly. Replace the sensor if necessary.
  4. Check the electrical connections between the sensor, ECM, and other relevant components to ensure a secure and proper connection.
  5. Clear the trouble code from the ECM using a scan tool and perform a test drive to verify that the issue has been resolved.

Cost to Fix P2122 2015 GMC Sierra

The typical repair costs for addressing the P2122 code on a 2015 GMC Sierra can vary depending on the specific cause of the issue and the cost of parts and labor. In general, the replacement of an accelerator pedal position sensor can range from $100 to $200, while the cost of labor can add an additional $100 to $200. The total repair cost may therefore fall within the range of $200 to $400. It's important to note that labor rates at auto repair shops can vary based on location, the vehicle make and model, and the complexity of the repair. It's advisable to check with local shops for a more accurate estimate.

What does this mean?

Tech Notes for P2122 2015 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 P2122 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code P2122 in a 2015 GMC Sierra?

The common symptoms of OBDII code P2122 include a decrease in engine power, acceleration issues, and the illumination of the Check Engine Light on the dashboard.

2. What does the OBDII code P2122 indicate in a 2015 GMC Sierra?

OBDII code P2122 in a 2015 GMC Sierra indicates a problem with the Accelerator Pedal Position Sensor 1 Circuit, specifically reporting low voltage.

3. What are the possible causes of OBDII code P2122 in a 2015 GMC Sierra?

Possible causes of OBDII code P2122 in a 2015 GMC Sierra include a faulty accelerator pedal position sensor, damaged wiring or connectors in the sensor circuit, or issues with the vehicle's electronic control module.

4. How can I diagnose the OBDII code P2122 in a 2015 GMC Sierra?

Diagnosing OBDII code P2122 involves using a scan tool to retrieve the trouble codes, testing the accelerator pedal position sensor and its circuit for proper voltage and continuity, and inspecting the related wiring and connectors for any damage.

5. Can I still drive my 2015 GMC Sierra with OBDII code P2122?

While it may be possible to drive the vehicle with OBDII code P2122, it is not recommended as it can lead to further damage and potential safety issues due to compromised acceleration and engine performance.

6. How can I repair OBDII code P2122 in a 2015 GMC Sierra?

Repairing OBDII code P2122 in a 2015 GMC Sierra typically involves replacing the accelerator pedal position sensor if it is found to be faulty, repairing or replacing damaged wiring or connectors, and clearing the trouble codes with a scan tool.

7. Is it safe to continue driving my 2015 GMC Sierra after repairing OBDII code P2122?

Once OBDII code P2122 has been properly repaired, it should be safe to drive the 2015 GMC Sierra. However, it is advisable to test drive the vehicle to ensure that the acceleration and engine performance are back to normal.

8. Can a DIY enthusiast fix OBDII code P2122 in a 2015 GMC Sierra?

While some DIY enthusiasts may have the skills to diagnose and repair OBDII code P2122, it is recommended to have a professional mechanic perform the repairs to ensure proper diagnosis and resolution of the issue.

9. How much does it cost to repair OBDII code P2122 in a 2015 GMC Sierra?

The cost of repairing OBDII code P2122 in a 2015 GMC Sierra can vary depending on the extent of the issue, the cost of parts needed for repair, and the labor rates of the mechanic or repair shop. It is advisable to get a few quotes from different mechanics to compare prices.

10. Can OBDII code P2122 in a 2015 GMC Sierra cause any long-term damage if left untreated?

If left untreated, OBDII code P2122 in a 2015 GMC Sierra can potentially cause further damage to the vehicle's engine and drivability. It is recommended to address the issue promptly to avoid any long-term consequences.

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