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Engine-Codes – GMC – P2123 2014 GMC Sierra

P2123 2014 GMC Sierra Code - Accelerator Pedal Position Sensor 1 Circuit High Voltage

Quick Answer

The P2123 diagnostic trouble code (DTC) for a 2014 GMC Sierra refers to a potential issue with the Accelerator Pedal Position Sensor 1 Circuit having high voltage. Common causes include Malfunctioning accelerator pedal position sensor, Damaged wiring or connectors in the sensor circuit, Faulty 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
P2123 2014 GMC Sierra indicates Accelerator Pedal Position Sensor 1 Circuit High Voltage.
Common causes
Common causes include Malfunctioning accelerator pedal position sensor, Damaged wiring or connectors in the sensor circuit, Faulty 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 12, 2024
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Code P2123 2014 GMC Sierra Description

The P2123 diagnostic trouble code (DTC) for a 2014 GMC Sierra refers to a potential issue with the Accelerator Pedal Position Sensor 1 Circuit having high voltage. This sensor is a crucial component of the vehicle's electronic throttle control system, responsible for communicating the position of the accelerator pedal to the engine control module (ECM) to adjust the engine's throttle accordingly. When the sensor detects a higher than normal voltage, it indicates an electrical problem within the sensor circuit.

OBDII Code P2123 2014 GMC Sierra - Accelerator Pedal Position Sensor 1 Circuit High Voltage
P2123 2014 GMC Sierra Code - Accelerator Pedal Position Sensor 1 Circuit High Voltage

Common Causes of P2123 2014 GMC Sierra

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

Symptoms of P2123 2014 GMC Sierra

  1. Loss of throttle response or unresponsive acceleration
  2. Engine stalling or hesitation during acceleration
  3. Illumination of the check engine light
  4. Reduced fuel efficiency
  5. Rough idling or surging engine

How to Fix P2123 2014 GMC Sierra

  1. Begin by diagnosing the issue using a scan tool to retrieve the specific DTC and perform a thorough inspection of the accelerator pedal position sensor and its circuitry.
  2. Check the wiring and connectors for any signs of damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test the accelerator pedal position sensor using a multimeter to ensure it is functioning correctly. Replace the sensor if it fails the test.
  4. Clear the DTC and reset the ECM to see if the issue persists. Perform a test drive to verify that the symptoms have been resolved.
  5. If the problem persists, further diagnostics may be required to identify any underlying issues with the throttle body or ECM.

Cost to Fix P2123 2014 GMC Sierra

The cost of repairing the Accelerator Pedal Position Sensor 1 Circuit High Voltage issue can vary depending on the specific cause of the problem and the extent of the repairs needed. In general, replacing the accelerator pedal position sensor can cost between $100 and $200, while addressing wiring or connector issues may range from $50 to $150. If the ECM or throttle body needs to be replaced, the cost can increase significantly, potentially reaching $500 or more for the parts alone.

What does this mean?

Tech Notes for P2123 2014 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 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P2123 in a 2014 GMC Sierra?

The common symptoms of OBDII code P2123 in a 2014 GMC Sierra include issues with acceleration, decreased engine performance, and the illumination of the Check Engine Light.

2. What does the OBDII code P2123 "Accelerator Pedal Position Sensor 1 Circuit High Voltage" mean for a 2014 GMC Sierra?

The code P2123 indicates that there is a high voltage condition detected in the circuit for the accelerator pedal position sensor 1 in a 2014 GMC Sierra.

3. What are the possible causes of OBDII code P2123 in a 2014 GMC Sierra?

Possible causes of OBDII code P2123 in a 2014 GMC Sierra include a faulty accelerator pedal position sensor, wiring issues, connector problems, or a problem with the engine control module (ECM).

4. How can I diagnose the OBDII code P2123 in my 2014 GMC Sierra?

Diagnosing OBDII code P2123 in a 2014 GMC Sierra involves using a diagnostic scanner to retrieve the code, checking the wiring and connectors for any visible damage, and testing the accelerator pedal position sensor for proper functionality.

5. Is it safe to drive my 2014 GMC Sierra with OBDII code P2123 active?

It is not recommended to drive your 2014 GMC Sierra with OBDII code P2123 active, as it can lead to poor engine performance and potential safety hazards due to issues with acceleration.

6. Can I repair OBDII code P2123 in my 2014 GMC Sierra myself?

Depending on your level of automotive expertise, you may be able to repair OBDII code P2123 in your 2014 GMC Sierra by replacing the faulty accelerator pedal position sensor or addressing any wiring/connection issues. If unsure, it's best to consult a professional mechanic.

7. How much does it typically cost to repair OBDII code P2123 in a 2014 GMC Sierra?

The cost to repair OBDII code P2123 in a 2014 GMC Sierra can vary depending on the specific cause of the issue. Expenses may include parts such as a new accelerator pedal position sensor and labor costs if you opt for professional repair services.

8. Can OBDII code P2123 in a 2014 GMC Sierra cause other problems if left untreated?

If left untreated, OBDII code P2123 in a 2014 GMC Sierra can potentially lead to further damage to the engine or other related components due to improper sensor readings affecting engine performance.

9. How long does it typically take to repair OBDII code P2123 in a 2014 GMC Sierra?

The repair time for OBDII code P2123 in a 2014 GMC Sierra can vary depending on the exact cause of the issue and the complexity of the repair process. It may take a few hours to a day for the repair to be completed.

10. Are there any preventive measures to avoid OBDII code P2123 in a 2014 GMC Sierra?

To help prevent OBDII code P2123 in a 2014 GMC Sierra, it's essential to perform regular vehicle maintenance, including checking and replacing faulty sensors or wiring as needed, and addressing any engine performance issues promptly.

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