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P2123 2016 GMC Sierra Code - Accelerator Pedal Position Sensor 1 Circuit High Voltage

Quick Answer

The diagnostic trouble code P2123 for a 2016 GMC Sierra indicates an issue with the Accelerator Pedal Position Sensor 1 Circuit High Voltage. Common causes include Wiring issues such as a short circuit or open circuit in the accelerator pedal position sensor circuit, A faulty accelerator pedal position sensor that is sending incorrect voltage readings to the ECM, Malfunctioning ECM that is unable to interpret the signals from the sensor correctly. 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 2016 GMC Sierra indicates Accelerator Pedal Position Sensor 1 Circuit High Voltage.
Common causes
Common causes include Wiring issues such as a short circuit or open circuit in the accelerator pedal position sensor circuit, A faulty accelerator pedal position sensor that is sending incorrect voltage readings to the ECM, Malfunctioning ECM that is unable to interpret the signals from the sensor correctly.
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 11, 2024
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Code P2123 2016 GMC Sierra Description

The diagnostic trouble code P2123 for a 2016 GMC Sierra indicates an issue with the Accelerator Pedal Position Sensor 1 Circuit High Voltage. The accelerator pedal position sensor is a crucial component that communicates the position of the accelerator pedal to the engine control module (ECM). This information is essential for the ECM to adjust the air-fuel mixture and ignition timing to ensure optimal engine performance and fuel efficiency.

OBDII Code P2123 2016 GMC Sierra - Accelerator Pedal Position Sensor 1 Circuit High Voltage
P2123 2016 GMC Sierra Code - Accelerator Pedal Position Sensor 1 Circuit High Voltage

Common Causes of P2123 2016 GMC Sierra

  1. Wiring issues such as a short circuit or open circuit in the accelerator pedal position sensor circuit.
  2. A faulty accelerator pedal position sensor that is sending incorrect voltage readings to the ECM.
  3. Malfunctioning ECM that is unable to interpret the signals from the sensor correctly.
  4. Poor electrical connections or corrosion in the sensor circuit.
  5. Environmental factors such as moisture or debris affecting the sensor's performance.

Symptoms of P2123 2016 GMC Sierra

  1. Reduced acceleration or lack of response when pressing the accelerator pedal.
  2. Engine hesitations or surging during acceleration.
  3. Illumination of the check engine light on the dashboard.
  4. Rough idling or inconsistent engine performance.
  5. Poor fuel economy or decreased overall vehicle performance.

How to Fix P2123 2016 GMC Sierra

  1. Begin by conducting a thorough inspection of the accelerator pedal position sensor circuit, checking for any visible damage or loose connections.
  2. Use a multimeter to test the voltage output of the sensor and compare it to the manufacturer's specifications.
  3. If the sensor readings are outside of the acceptable range, replace the accelerator pedal position sensor with a new, OEM-quality part.
  4. Clear the diagnostic trouble codes from the ECM using a scan tool and test drive the vehicle to ensure that the issue has been resolved.
  5. If the problem persists, further diagnostic testing may be necessary to identify any underlying issues with the wiring or ECM.

Cost to Fix P2123 2016 GMC Sierra

The cost of repairing the Accelerator Pedal Position Sensor 1 Circuit High Voltage issue on a 2016 GMC Sierra can vary depending on the specific cause of the problem and the labor rates in your area. On average, the cost of replacing the accelerator pedal position sensor can range from $100 to $300, including parts and labor. Additional costs may be incurred if further diagnosis or repairs are needed. It's recommended to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on your vehicle's specific needs and location. Labor rates at auto repair shops typically range from $80 to $150 per hour, but these rates can vary based on various factors.

What does this mean?

Tech Notes for P2123 2016 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 P2123 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P2123 in a 2016 GMC Sierra?

When the Accelerator Pedal Position Sensor 1 Circuit registers high voltage, symptoms may include reduced engine power, unresponsive acceleration, and an illuminated Check Engine light.

2. What are the possible causes of OBDII code P2123 in a 2016 GMC Sierra?

Potential causes of P2123 include a faulty accelerator pedal position sensor, wiring issues, a poor electrical connection, or a problem with the engine control module.

3. How can I diagnose the issue causing OBDII code P2123 in my 2016 GMC Sierra?

To diagnose P2123, you can use an OBDII scanner to retrieve the trouble code, visually inspect the accelerator pedal sensor and related wiring, and perform a voltage test on the sensor.

4. Can I continue driving my 2016 GMC Sierra with OBDII code P2123 present?

It is not recommended to drive with code P2123 active, as it can lead to unsafe driving conditions and potential damage to the vehicle. Get the issue diagnosed and repaired promptly.

5. What are some repair tips for fixing OBDII code P2123 in a 2016 GMC Sierra?

Repair tips include checking and cleaning electrical connections, replacing the accelerator pedal position sensor if faulty, repairing damaged wiring, and resetting the fault code after repairs.

6. How much does it typically cost to repair OBDII code P2123 in a 2016 GMC Sierra?

The cost of repairing P2123 can vary depending on the cause of the issue, labor rates, and parts needed. It's advisable to consult a mechanic or dealership for an accurate estimate.

7. Can a DIY enthusiast fix OBDII code P2123 in a 2016 GMC Sierra?

While some DIY enthusiasts may be able to address simple causes of P2123, such as checking connections or replacing the sensor, complex issues may require professional diagnosis and repair.

8. Will disconnecting the battery reset OBDII code P2123 in a 2016 GMC Sierra?

Disconnecting the battery may temporarily clear the fault code, but if the underlying issue causing P2123 is not fixed, the code will likely reappear after driving the vehicle.

9. How urgent is it to address OBDII code P2123 in a 2016 GMC Sierra?

It is essential to address P2123 promptly to prevent further damage to the vehicle, ensure safe driving conditions, and avoid potential engine performance issues associated with the fault code.

10. Is it possible for OBDII code P2123 in a 2016 GMC Sierra to return after being repaired?

If the root cause of P2123 is not properly addressed, the code can reappear. Ensure the repair is done correctly, and all related components are thoroughly inspected to prevent code recurrence.

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