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Engine-Codes – GMC – P2128 GMC

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

Quick Answer

The P2128 code for GMC vehicles refers to an issue with the Accelerator Pedal Position Sensor 2 Circuit High Voltage. Common causes include Damaged wiring or connectors in the sensor circuit, Faulty accelerator pedal position sensor, Malfunctioning 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 GMC indicates Accelerator Pedal Position Sensor 2 Circuit High Voltage.
Common causes
Common causes include Damaged wiring or connectors in the sensor circuit, Faulty accelerator pedal position sensor, Malfunctioning 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 09, 2024
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Code P2128 GMC Description

The P2128 code for GMC vehicles refers to an issue with the Accelerator Pedal Position Sensor 2 Circuit High Voltage. This sensor is a crucial component of the vehicle's electronic throttle control system, responsible for relaying the position of the accelerator pedal to the engine control module (ECM). The ECM uses this information to adjust the throttle opening and fuel delivery, ensuring optimal engine performance and fuel efficiency.

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

Common Causes of P2128 GMC

  1. Damaged wiring or connectors in the sensor circuit
  2. Faulty accelerator pedal position sensor
  3. Malfunctioning ECM
  4. Issues with the throttle control system
  5. Corrosion or moisture in the sensor components

Symptoms of P2128 GMC

  1. Erratic throttle response
  2. Engine hesitation or surging
  3. Reduced acceleration
  4. Illumination of the Check Engine Light
  5. Vehicle entering limp mode

How to Fix P2128 GMC

  1. Perform a diagnostic scan to confirm the P2128 code and identify the specific cause of the high voltage signal.
  2. Inspect the wiring and connectors in the accelerator pedal position sensor circuit for any damage or corrosion. Repair or replace as necessary.
  3. Test the accelerator pedal position sensor for proper operation using a multimeter or scan tool. Replace the sensor if it fails the test.
  4. Check the ECM for any faults or malfunctions that could be causing the high voltage signal. Replace or reprogram the ECM as needed.
  5. Clear the trouble code from the vehicle's memory and perform a test drive to ensure that the issue has been resolved.

Cost to Fix P2128 GMC

The typical repair costs for addressing a P2128 code on a GMC vehicle can vary depending on the specific cause of the issue. In general, replacing the accelerator pedal position sensor or repairing damaged wiring may cost between $150 and $300, including parts and labor. However, if the ECM needs to be replaced or reprogrammed, the cost could range from $500 to $1000 or more. It is advisable to consult with a qualified mechanic or auto repair shop for an accurate estimate based on the vehicle's make and model, as well as the extent of the repairs required. Additionally, factors such as diagnosis time and labor rates can influence the overall cost, with hourly rates typically ranging from $80 to $150.

What does this mean?

Tech Notes for P2128 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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