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P2123 Hyundai Code - Accelerator Position Circuit - High Input

Quick Answer

The P2123 diagnostic trouble code (DTC) for Hyundai vehicles refers to an issue with the accelerator position circuit having a high input. Common causes include Faulty accelerator pedal position sensor, Damaged wiring or connectors in the accelerator position circuit, Malfunctioning 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 Hyundai indicates Accelerator Position Circuit - High Input.
Common causes
Common causes include Faulty accelerator pedal position sensor, Damaged wiring or connectors in the accelerator position circuit, Malfunctioning 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 09, 2024
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Code P2123 Hyundai Description

The P2123 diagnostic trouble code (DTC) for Hyundai vehicles refers to an issue with the accelerator position circuit having a high input. In simpler terms, this means that the Engine Control Module (ECM) has detected a voltage signal from the accelerator pedal position sensor that is higher than normal or out of the specified range. The accelerator pedal position sensor is responsible for sending signals to the ECM to indicate how much throttle input the driver is requesting. When the ECM receives a high voltage signal, it may not be able to accurately determine the driver's throttle input, leading to potential performance issues.

OBDII Code P2123 Hyundai - Accelerator Position Circuit - High Input
P2123 Hyundai Code - Accelerator Position Circuit - High Input

Common Causes of P2123 Hyundai

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

Symptoms of P2123 Hyundai

  1. Loss of power or hesitation during acceleration
  2. Rough idling or stalling
  3. Check Engine Light illuminated on the dashboard
  4. Reduced fuel efficiency
  5. Inability to maintain a constant speed while driving

How to Fix P2123 Hyundai

  1. Use a diagnostic scanner to retrieve the trouble code and perform a thorough inspection of the accelerator position circuit.
  2. Inspect the accelerator pedal position sensor for any signs of damage or wear and replace if necessary.
  3. Check the wiring and connectors in the accelerator position circuit for any breaks, corrosion, or loose connections and repair as needed.
  4. Reset the ECM and clear the trouble code from the system.
  5. Test drive the vehicle to ensure that the issue has been resolved and that the accelerator position sensor is functioning correctly.

Cost to Fix P2123 Hyundai

The typical repair costs for addressing a P2123 diagnostic trouble code can vary depending on the specific cause of the issue. In general, replacing a faulty accelerator pedal position sensor can cost between $100 and $200, while addressing wiring or connector issues may require additional labor costs and could range from $150 to $300. If the ECM needs to be replaced, the cost could be higher, potentially exceeding $500. It is important to note that these estimates do not include diagnostic time, which can range from $80 to $150 per hour, and labor rates for repairs, which can vary based on location and the specific repair shop. It is recommended to consult with a qualified mechanic or auto repair shop for a more accurate cost estimate based on the vehicle's make and model.

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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 Hyundai Code

1. What does the OBDII code P2123 mean on a Hyundai?

P2123 indicates a high input signal in the accelerator position sensor circuit, meaning the sensor is sending voltage readings that are out of the expected range.

2. What are the symptoms of a P2123 code in a Hyundai?

Symptoms may include poor throttle response, reduced engine power, the car entering limp mode, or the Check Engine Light illuminating.

3. What causes the P2123 code in a Hyundai?

Common causes include a faulty accelerator pedal position sensor, damaged wiring or connectors in the sensor circuit, or a malfunctioning engine control module (ECM).

4. Can I drive my Hyundai with a P2123 code?

Driving with this code is not recommended as it can lead to unsafe driving conditions, such as sudden loss of acceleration or the vehicle entering limp mode.

5. How do I diagnose the P2123 code on a Hyundai?

Begin with a visual inspection of the accelerator pedal position sensor and its wiring. Use a scan tool to monitor live data from the sensor and check if the voltage readings are within the expected range.

6. How do I fix the P2123 code in a Hyundai?

Repairs may include replacing the accelerator pedal position sensor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the ECM if necessary.

7. What tools are needed to troubleshoot a P2123 code?

A diagnostic scan tool, multimeter, and basic hand tools are typically needed to troubleshoot and repair this code.

8. Does a P2123 code always mean the accelerator pedal position sensor is bad?

No, the issue could also be with the wiring, connectors, or ECM. A thorough diagnosis is necessary to pinpoint the exact cause.

9. How much does it cost to fix a P2123 code on a Hyundai?

The cost can vary depending on the root cause. Replacing the accelerator pedal position sensor typically costs between $100 and $300, including parts and labor.

10. Can a P2123 code cause long-term damage to my Hyundai?

If left unaddressed, this code can lead to reduced drivability and potentially damage other components, such as the ECM, due to prolonged strain on the system.

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