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

Quick Answer

The P2128 diagnostic trouble code for Chevrolet vehicles indicates that there is a high voltage condition detected in the circuit for the Accelerator Pedal Position Sensor 2 (APP Sensor 2). Common causes include Faulty Accelerator Pedal Position Sensor, Wiring harness issues, 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
P2128 Chevrolet indicates Accelerator Pedal Position Sensor 2 Circuit High Voltage.
Common causes
Common causes include Faulty Accelerator Pedal Position Sensor, Wiring harness issues, 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 07, 2024
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Code P2128 Chevrolet Description

The P2128 diagnostic trouble code for Chevrolet vehicles indicates that there is a high voltage condition detected in the circuit for the Accelerator Pedal Position Sensor 2 (APP Sensor 2). The Accelerator Pedal Position Sensor is a vital component of the electronic throttle control system, which communicates the position of the accelerator pedal to the Engine Control Module (ECM). The ECM uses this information to adjust fuel delivery and ignition timing to achieve the desired engine performance.

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

Common Causes of P2128 Chevrolet

  1. Faulty Accelerator Pedal Position Sensor
  2. Wiring harness issues
  3. Malfunctioning Engine Control Module (ECM)
  4. Poor connection in the sensor circuit
  5. Corrosion or damage to sensor components

Symptoms of P2128 Chevrolet

  1. Erratic throttle response
  2. Reduced engine power
  3. Engine stalling
  4. Check Engine Light illuminated
  5. Vehicle going into limp mode

How to Fix P2128 Chevrolet

  1. Begin by conducting a thorough inspection of the Accelerator Pedal Position Sensor 2 circuit, including the wiring harness and connections for any signs of damage or corrosion.
  2. Test the Accelerator Pedal Position Sensor 2 using a multimeter to verify if it is functioning within the manufacturer's specifications.
  3. Check the Engine Control Module (ECM) for any fault codes related to the Accelerator Pedal Position Sensor 2 circuit and address them accordingly.
  4. If the sensor is found to be faulty, replace it with a new one following manufacturer's guidelines and ensure proper calibration.
  5. Clear the diagnostic trouble codes from the ECM memory and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P2128 Chevrolet

The typical repair costs for addressing a P2128 Chevrolet diagnostic trouble code can range from $150 to $400, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that prices can vary based on factors such as location, vehicle make and model, and the rates of the auto repair shop. Additionally, diagnosis time and labor rates at different shops can also impact the overall cost. It is recommended to obtain estimates from local repair shops for a more accurate cost assessment.

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Tech Notes for P2128 Chevrolet





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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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