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Engine-Codes – GMC – P2128 2014 GMC Sierra

P2128 2014 GMC Sierra Code - Accelerator Pedal Position Sensor 2 Circuit High Voltage

Quick Answer

The P2128 code for a 2014 GMC Sierra indicates a problem with the Accelerator Pedal Position Sensor 2 Circuit registering high voltage. Common causes include Faulty Accelerator Pedal Position Sensor 2, Wiring or connector issues in the sensor circuit, Corrosion or damage to the sensor components. 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 2014 GMC Sierra indicates Accelerator Pedal Position Sensor 2 Circuit High Voltage.
Common causes
Common causes include Faulty Accelerator Pedal Position Sensor 2, Wiring or connector issues in the sensor circuit, Corrosion or damage to the sensor components.
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 15, 2024
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Code P2128 2014 GMC Sierra Description

The P2128 code for a 2014 GMC Sierra indicates a problem with the Accelerator Pedal Position Sensor 2 Circuit registering high voltage. This sensor is crucial for the vehicle's electronic throttle control system, as it monitors the position of the accelerator pedal and sends this information to the engine control module (ECM). The ECM uses this data to determine the appropriate fuel delivery and ignition timing for optimal engine performance.

OBDII Code P2128 2014 GMC Sierra - Accelerator Pedal Position Sensor 2 Circuit High Voltage
P2128 2014 GMC Sierra Code - Accelerator Pedal Position Sensor 2 Circuit High Voltage

Common Causes of P2128 2014 GMC Sierra

  1. Faulty Accelerator Pedal Position Sensor 2.
  2. Wiring or connector issues in the sensor circuit.
  3. Corrosion or damage to the sensor components.
  4. ECM software or hardware problems.
  5. Environmental factors such as moisture or debris affecting sensor operation.

Symptoms of P2128 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. Reduced fuel efficiency.
  5. Increased emissions.

How to Fix P2128 2014 GMC Sierra

  1. Begin by diagnosing the specific cause of the high voltage in the Accelerator Pedal Position Sensor 2 Circuit using a diagnostic scanner.
  2. Inspect the sensor, wiring, and connectors for any visible damage or corrosion. Replace any faulty components.
  3. Clear the trouble codes from the ECM memory and reset the system.
  4. Test drive the vehicle to ensure the issue has been resolved and that the sensor is functioning correctly.
  5. If the problem persists, consult a professional mechanic for further diagnosis and repair.

Cost to Fix P2128 2014 GMC Sierra

The typical repair costs for addressing the P2128 code on a 2014 GMC Sierra can range from $150 to $400, including parts and labor. However, it's important 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. It's advisable to check local rates for a more accurate estimate before proceeding with the repair.

What does this mean?

Tech Notes for P2128 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 P2128 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P2128 in a 2014 GMC Sierra?

- Common symptoms include reduced engine power, a check engine light illuminated on the dashboard, and potential issues with the acceleration response.

2. What does the OBDII code P2128 indicating "Accelerator Pedal Position Sensor 2 Circuit High Voltage" mean for a 2014 GMC Sierra?

- This code suggests that there is a high voltage condition detected in the circuit related to the accelerator pedal position sensor 2 in the vehicle.

3. What are some possible causes of OBDII code P2128 in a 2014 GMC Sierra?

- Potential causes include a faulty accelerator pedal position sensor, damaged wiring or connectors in the sensor circuit, or a problem with the engine control module.

4. How serious is OBDII code P2128 in a 2014 GMC Sierra?

- While the vehicle may still be operable with this code present, it is important to address it promptly to prevent potential safety hazards and further damage to the engine.

5. Can I continue driving my 2014 GMC Sierra with OBDII code P2128 present?

- It is not recommended to drive the vehicle with this code active, as it could lead to reduced performance and safety risks. It's best to have the issue diagnosed and repaired as soon as possible.

6. How can I diagnose and repair OBDII code P2128 in my 2014 GMC Sierra?

- Diagnosis typically involves using a scan tool to read the code, testing the accelerator pedal position sensor, inspecting wiring and connectors, and potentially replacing the sensor or addressing any wiring issues.

7. Is it possible to reset OBDII code P2128 in a 2014 GMC Sierra without fixing the underlying issue?

- While you can clear the code with a scan tool, it is not recommended to do so without addressing the root cause, as the issue may persist and lead to further problems down the line.

8. Can a DIY enthusiast fix OBDII code P2128 in a 2014 GMC Sierra?

- Depending on your skill level and access to tools, you may be able to address this issue yourself by replacing the accelerator pedal position sensor or fixing wiring problems. However, professional diagnosis and repair are recommended for accurate and long-lasting solutions.

9. How much does it typically cost to repair OBDII code P2128 in a 2014 GMC Sierra?

- The cost of repairs can vary based on the specific cause of the code and labor rates in your area. It's advisable to consult a mechanic for a diagnosis and estimate before proceeding with any repairs.

10. Are there any preventative measures to avoid OBDII code P2128 in a 2014 GMC Sierra?

- Regular vehicle maintenance, such as checking wiring integrity and sensor function during scheduled services, can help prevent issues like high voltage conditions in the accelerator pedal position sensor circuit.

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