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P2123 Chevrolet Code - Accelerator Pedal Position Sensor 1 Circuit High Voltage

Quick Answer

The P2123 code for Chevrolet indicates an issue with the Accelerator Pedal Position Sensor 1 Circuit registering high voltage. Common causes include Faulty Accelerator Pedal Position Sensor, 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
P2123 Chevrolet indicates Accelerator Pedal Position Sensor 1 Circuit High Voltage.
Common causes
Common causes include Faulty Accelerator Pedal Position Sensor, 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 06, 2024
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Code P2123 Chevrolet Description

The P2123 code for Chevrolet indicates an issue with the Accelerator Pedal Position Sensor 1 Circuit registering high voltage. This sensor is responsible for monitoring the position of the accelerator pedal and sending this information to the engine control module to adjust the fuel injection and ignition timing. When the sensor detects a high voltage signal, it can lead to incorrect fuel delivery and engine performance issues. If not addressed, it can potentially lead to reduced fuel efficiency, drivability issues, and even engine stalling.

OBDII Code P2123 Chevrolet - Accelerator Pedal Position Sensor 1 Circuit High Voltage
P2123 Chevrolet Code - Accelerator Pedal Position Sensor 1 Circuit High Voltage

Common Causes of P2123 Chevrolet

  1. Faulty Accelerator Pedal Position Sensor.
  2. Wiring or connector issues in the sensor circuit.
  3. Corrosion or damage to the sensor components.
  4. Issues with the engine control module (ECM) communication.
  5. Electrical interference or short circuits in the sensor circuit.

Symptoms of P2123 Chevrolet

  1. Reduced acceleration or lack of response when pressing the accelerator pedal.
  2. Engine hesitation or surging during acceleration.
  3. Illumination of the Check Engine Light on the dashboard.
  4. Rough idling or stalling at idle.
  5. Decreased fuel efficiency.

How to Fix P2123 Chevrolet

  1. Begin by diagnosing the issue with a scan tool to confirm the P2123 code.
  2. Inspect the wiring harness and connectors for any damage or corrosion.
  3. Test the Accelerator Pedal Position Sensor for proper operation or replace if necessary.
  4. Clear the fault codes and reset the ECM to see if the issue persists.
  5. Test drive the vehicle to ensure proper acceleration and performance.

Cost to Fix P2123 Chevrolet

The typical repair costs for addressing a P2123 code on a Chevrolet can range from $150 to $400, depending on the specific cause of the issue and the parts needed for replacement. This estimate includes parts and labor costs. It's important to note that diagnostic time and labor rates can vary, so it's recommended to check with local auto repair shops for a more accurate estimate.

What does this mean?

Tech Notes for P2123 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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