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Engine-Codes – Generic – P2128

P2128 Code - Accelerator Pedal Position Sensor 2 Circuit High Voltage

Quick Answer

The diagnostic trouble code P2128 indicates that there is a malfunction in the Accelerator Pedal Position Sensor 2 Circuit, specifically that the voltage is too high. Common causes include Faulty accelerator pedal position sensor, Short or open circuit in the wiring, Malfunction in the 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 indicates Accelerator Pedal Position Sensor 2 Circuit High Voltage.
Common causes
Common causes include Faulty accelerator pedal position sensor, Short or open circuit in the wiring, Malfunction in the 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 Description

The diagnostic trouble code P2128 indicates that there is a malfunction in the Accelerator Pedal Position Sensor 2 Circuit, specifically that the voltage is too high. This sensor is responsible for monitoring the position of the accelerator pedal and sending this information to the Engine Control Module (ECM) to adjust the fuel injection and ignition timing accordingly.

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

Common Causes of P2128

  1. Faulty accelerator pedal position sensor
  2. Short or open circuit in the wiring
  3. Malfunction in the ECM
  4. Corrosion or damage to the sensor connector
  5. Electrical interference or poor grounding

Symptoms of P2128

  1. Poor acceleration
  2. Rough idling
  3. Hesitation during acceleration
  4. Engine stalling
  5. Check Engine Light illuminated

How to Fix P2128

  1. Begin by diagnosing the issue using a scan tool to retrieve the specific trouble code and verify the high voltage condition in the Accelerator Pedal Position Sensor 2 Circuit.
  2. Inspect the wiring harness and sensor connector for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test the accelerator pedal position sensor using a multimeter to ensure it is functioning within the manufacturer's specifications. Replace the sensor if it is found to be faulty.
  4. Clear the trouble code from the ECM memory and perform a test drive to verify that the issue has been resolved.
  5. If the issue persists, further diagnostics may be required to pinpoint the exact cause, such as testing the ECM for proper operation or checking for any additional electrical issues.

Cost to Fix P2128

The typical repair costs for addressing a P2128 code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. In general, replacing a faulty accelerator pedal position sensor can cost between $100 and $200, while addressing wiring or ECM issues may increase the total repair cost. Overall, the total repair cost for this issue could range from $150 to $500 or more, including parts and labor. It is advisable to consult with a professional mechanic to get an accurate estimate based on your vehicle's make and model, as well as the extent of the repairs needed.

What does this mean?

Tech Notes for P2128





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Code P2128 Information for Specific Makes

  • P2128 Acura — Accelerator Pedal Position Sensor 'B' Throttle Position Sensor 'D' Circuit High Voltage
  • P2128 BMW — Throttle/Pedal Positio Sensor/Switch 'E' Circuit High
  • P2128 Buick — Accelerator Pedal Position Sensor 2 Circuit High Voltage
  • P2128 Cadillac — Accelerator Pedal Position Sensor 2 Circuit High Voltage
  • P2128 Chevrolet — Accelerator Pedal Position Sensor 2 Circuit High Voltage
  • P2128 Chrysler — Throttle/Pedal Position Sensor/Switch 'E' Circuit High
  • P2128 Dodge — Throttle/Pedal Position Sensor/Switch 'E' Circuit High
  • P2128 Ford — Throttle/Pedal Position Sensor/Switch 'E' Circuit High
  • P2128 GMC — Accelerator Pedal Position Sensor 2 Circuit High Voltage
  • P2128 Honda — Accelerator Pedal Position Sensor 'B' Throttle Position Sensor 'D' Circuit High Voltage
  • P2128 Hyundai — Accelerator Position Circuit - High Input
  • P2128 Infiniti — Accelerator Pedal Position Sensor Circuit
  • P2128 Jeep — Throttle/Pedal Position Sensor/Switch 'E' Circuit High
  • P2128 Lexus — Throttle Pedal Position Sensor/Switch 'E' Circuit Input High
  • P2128 Lincoln — Throttle/Pedal Position Sensor/Switch 'E' Circuit High
  • P2128 Mercedes-Benz — Throttle/Pedal Position Sensor/Switch 'E' Circuit High
  • P2128 Mercury — Throttle/Pedal Position Sensor/Switch 'E' Circuit High
  • P2128 MINI — Throttle/Pedal Positio Sensor/Switch 'E' Circuit High
  • P2128 Nissan — Accelerator Pedal Position Sensor Circuit
  • P2128 Scion — Throttle Pedal Position Sensor/Switch 'E' Circuit Input High
  • P2128 Toyota — Throttle Pedal Position Sensor/Switch 'E' Circuit Input High
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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