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Engine-Codes – KIA – P0123 KIA

P0123 KIA Code - Throttle/Pedal Position Sensor 'A' Circuit High Input

Quick Answer

The P0123 code for KIA vehicles indicates a problem with the Throttle/Pedal Position Sensor 'A' Circuit High Input. Common causes include Faulty Throttle/Pedal Position Sensor, Damaged or corroded wiring connecting the sensor to the ECM, Issues with the ECM that disrupt communication with the sensor. 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
P0123 KIA indicates Throttle/Pedal Position Sensor 'A' Circuit High Input.
Common causes
Common causes include Faulty Throttle/Pedal Position Sensor, Damaged or corroded wiring connecting the sensor to the ECM, Issues with the ECM that disrupt communication with the sensor.
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 Aug 30, 2024
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Code P0123 KIA Description

The P0123 code for KIA vehicles indicates a problem with the Throttle/Pedal Position Sensor 'A' Circuit High Input. This sensor is responsible for monitoring the position of the throttle pedal and sending that information to the engine control module (ECM) to adjust the throttle accordingly. When the sensor sends a high input signal to the ECM, it means that the voltage is higher than the specified range, which can lead to issues with throttle response and overall engine performance.

OBDII Code P0123 KIA - Throttle/Pedal Position Sensor 'A' Circuit High Input
P0123 KIA Code - Throttle/Pedal Position Sensor 'A' Circuit High Input

Common Causes of P0123 KIA

  1. Faulty Throttle/Pedal Position Sensor.
  2. Damaged or corroded wiring connecting the sensor to the ECM.
  3. Issues with the ECM that disrupt communication with the sensor.
  4. Environmental factors such as moisture or debris affecting sensor performance.
  5. Incorrect sensor installation or calibration.

Symptoms of P0123 KIA

  1. Poor acceleration or lack of response when pressing the throttle pedal.
  2. Rough idling or fluctuating engine speed.
  3. Engine stalling or hesitation during acceleration.
  4. Check engine light illuminated on the dashboard.
  5. Reduced fuel efficiency.

How to Fix P0123 KIA

  1. Begin by diagnosing the specific cause of the high input signal, using a scan tool to read the code and identify the issue.
  2. Inspect the wiring harness and connectors for any signs of damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test the Throttle/Pedal Position Sensor for proper function and replace if faulty.
  4. Clear the diagnostic trouble codes from the ECM and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, further diagnosis may be required to pinpoint the exact source of the high input signal.

Cost to Fix P0123 KIA

The cost of repairing a Throttle/Pedal Position Sensor 'A' Circuit High Input issue can vary depending on the specific cause of the problem and the extent of the repair needed. In general, replacing the sensor itself can range from $100 to $300, while addressing wiring issues or ECM problems may increase the cost. Labor costs can also impact the total repair bill, with rates typically ranging from $80 to $150 per hour. It is recommended to consult a professional mechanic for an accurate estimate based on the specific circumstances of the vehicle.

When is the Code Detected?

The Throttle Position Sensor (TPS) signal 1 circuit has reported a high voltage

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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 P0123 KIA Code

1. What are the common symptoms of OBDII code P0123 in a KIA vehicle?

- Common symptoms include issues with acceleration, poor engine performance, stalling, and the vehicle going into "limp mode."

2. What does the OBDII code P0123 in a KIA indicate?

- The code P0123 indicates a high input in the Throttle/Pedal Position Sensor 'A' Circuit.

3. What are the possible causes of OBDII code P0123 in a KIA?

- Possible causes include a faulty throttle position sensor, damaged wiring or connectors in the sensor circuit, or issues with the engine control module.

4. How can I diagnose the Throttle/Pedal Position Sensor 'A' Circuit for OBDII code P0123 in my KIA?

- Diagnose the sensor circuit using a multimeter to check for proper voltage and resistance readings, inspect wiring and connectors for damage, and perform a visual inspection of the sensor.

5. Can a dirty throttle body cause OBDII code P0123 in a KIA?

- Yes, a dirty throttle body can sometimes cause erratic readings from the throttle position sensor, triggering code P0123. It is recommended to clean the throttle body as part of troubleshooting.

6. How can I repair OBDII code P0123 in my KIA?

- Repair options include replacing the throttle position sensor if faulty, repairing damaged wiring or connectors, cleaning the throttle body, or resetting the engine control module.

7. Is it safe to drive with OBDII code P0123 in a KIA?

- It is not recommended to drive with code P0123 as it can lead to poor engine performance and potential safety hazards. It is best to address the issue promptly.

8. Can a DIY enthusiast repair OBDII code P0123 in a KIA?

- Depending on the cause, DIY enthusiasts can attempt to repair code P0123 by replacing the throttle position sensor, cleaning the throttle body, or checking and repairing wiring connections.

9. Will disconnecting the battery reset OBDII code P0123 in a KIA?

- Disconnecting the battery may temporarily clear the code, but it is important to address the underlying issue causing code P0123 to prevent it from reoccurring.

10. How can I prevent OBDII code P0123 from coming back in my KIA?

- To prevent code P0123, ensure regular maintenance of the throttle system, check for wiring damage, keep the throttle body clean, and address any issues promptly to avoid sensor malfunctions.

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