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P2128 2015 GMC Sierra Code - Accelerator Pedal Position Sensor 2 Circuit High Voltage

Quick Answer

The P2128 diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Accelerator Pedal Position Sensor 2 Circuit registering a high voltage. Common causes include Worn-out accelerator pedal position sensor, Damaged or corroded wiring connected to the sensor, Faulty 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
P2128 2015 GMC Sierra indicates Accelerator Pedal Position Sensor 2 Circuit High Voltage.
Common causes
Common causes include Worn-out accelerator pedal position sensor, Damaged or corroded wiring connected to the sensor, Faulty 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 17, 2024
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Code P2128 2015 GMC Sierra Description

The P2128 diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Accelerator Pedal Position Sensor 2 Circuit registering a high voltage. This sensor is responsible for monitoring the position of the accelerator pedal and sending this information to the engine control module (ECM) to adjust fuel delivery and engine performance accordingly. When the sensor detects a high voltage signal, it indicates that there may be an issue with the sensor itself, the wiring connected to it, or the ECM receiving incorrect data.

OBDII Code P2128 2015 GMC Sierra - Accelerator Pedal Position Sensor 2 Circuit High Voltage
P2128 2015 GMC Sierra Code - Accelerator Pedal Position Sensor 2 Circuit High Voltage

Common Causes of P2128 2015 GMC Sierra

  1. Worn-out accelerator pedal position sensor
  2. Damaged or corroded wiring connected to the sensor
  3. Faulty ECM
  4. Communication error between sensor and ECM
  5. Electrical issues such as a short circuit or open circuit

Symptoms of P2128 2015 GMC Sierra

  1. Erratic throttle response
  2. Poor fuel efficiency
  3. Hesitation during acceleration
  4. Limp mode activation
  5. Lack of response when pressing the accelerator pedal

How to Fix P2128 2015 GMC Sierra

  1. Begin by diagnosing the issue using a scan tool to confirm the P2128 code and pinpoint the exact cause of the high voltage reading.
  2. Inspect the accelerator pedal position sensor and its wiring for any visible damage or wear. Replace the sensor if necessary.
  3. Check the ECM for any fault codes related to communication errors or internal faults. Repair or replace the ECM as needed.
  4. Clear the DTC and perform a test drive to ensure the issue has been resolved and that the accelerator pedal position sensor is functioning correctly.
  5. If the problem persists, further diagnostic testing may be required to identify any underlying issues that were not initially detected.

Cost to Fix P2128 2015 GMC Sierra

The typical repair costs for addressing a P2128 code in a 2015 GMC Sierra can range from $200 to $500, including parts and labor. However, it's important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships, while independent shops often charge less. For a more precise estimate, it's advisable to check local rates before proceeding with the repair.

What does this mean?

Tech Notes for P2128 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 P2128 2015 GMC Sierra Code

1. What does the OBDII code P2128 mean on a 2015 GMC Sierra?

P2128 indicates that the Engine Control Module (ECM) has detected a high voltage signal from the Accelerator Pedal Position Sensor 2 Circuit, which monitors throttle input.

2. What are common symptoms of code P2128 on a 2015 GMC Sierra?

Symptoms may include reduced engine performance, limited throttle response, the check engine light turning on, and the vehicle possibly entering limp mode.

3. What causes the P2128 code on a 2015 GMC Sierra?

Common causes include a faulty accelerator pedal position sensor, damaged wiring or connectors in the sensor circuit, or issues with the ECM itself.

4. Can I drive my 2015 GMC Sierra with a P2128 code?

Driving with this code is not recommended, as it may cause reduced throttle control and could lead to unsafe driving conditions.

5. How do I diagnose the P2128 code on a 2015 GMC Sierra?

Start by inspecting the accelerator pedal position sensor and its wiring for damage, check the sensor's voltage with a multimeter, and use a scan tool to monitor live data for irregularities.

6. How can I fix a P2128 code on a 2015 GMC Sierra?

Repairs may involve replacing the accelerator pedal position sensor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the ECM if necessary.

7. How much does it cost to repair code P2128 on a 2015 GMC Sierra?

Repair costs vary but typically range from $150 to $400, depending on whether the issue is with the sensor, wiring, or ECM.

8. Can a dirty throttle body cause a P2128 code on a 2015 GMC Sierra?

A dirty throttle body is unlikely to cause this code directly, but it may contribute to throttle-related issues. The primary cause is usually sensor or circuit-related.

9. Do I need to replace the accelerator pedal assembly for a P2128 code?

In some cases, replacing the entire accelerator pedal assembly is necessary if the position sensor is integrated and cannot be replaced separately.

10. Will clearing the P2128 code fix the problem on a 2015 GMC Sierra?

Clearing the code will temporarily turn off the check engine light, but the underlying issue must be resolved to prevent the code from returning.

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