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Engine-Codes – Infiniti – P0123 Infiniti

P0123 Infiniti Code - Throttle Position Sensor/Switch '1' Circuit High Input

Quick Answer

The P0123 Infiniti code indicates a problem with the throttle position sensor or switch circuit having a high input. Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the TPS circuit, Corrosion or poor electrical connections. 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 Infiniti indicates Throttle Position Sensor/Switch '1' Circuit High Input.
Common causes
Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the TPS circuit, Corrosion or poor electrical connections.
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 P0123 Infiniti Description

The P0123 Infiniti code indicates a problem with the throttle position sensor or switch circuit having a high input. The throttle position sensor (TPS) is a crucial component that monitors the position of the throttle valve in the engine. It sends this information to the engine control module (ECM) to adjust the air-fuel mixture for optimal performance. A high input in this circuit means that the voltage signal from the TPS is higher than expected, indicating a potential issue with the sensor or its wiring.

OBDII Code P0123 Infiniti - Throttle Position Sensor/Switch '1' Circuit High Input
P0123 Infiniti Code - Throttle Position Sensor/Switch '1' Circuit High Input

Common Causes of P0123 Infiniti

  1. Faulty throttle position sensor
  2. Damaged wiring or connectors in the TPS circuit
  3. Corrosion or poor electrical connections
  4. ECM malfunction
  5. Mechanical issues affecting the throttle system

Symptoms of P0123 Infiniti

  1. Rough idling or unstable engine speed
  2. Stalling or hesitation during acceleration
  3. Poor throttle response or lack of power
  4. Check engine light illuminated
  5. Reduced fuel efficiency

How to Fix P0123 Infiniti

  1. Diagnose the issue by using a scan tool to read the code and monitor TPS data.
  2. Inspect the throttle position sensor, wiring, and connectors for any damage or corrosion.
  3. Test the TPS with a multimeter to check for proper voltage output.
  4. Replace the throttle position sensor if it is faulty, ensuring proper installation and calibration.
  5. Clear the trouble code and perform a test drive to verify the repair and ensure the code does not return.

Cost to Fix P0123 Infiniti

The typical repair costs for addressing a P0123 Infiniti code can vary depending on the specific cause of the issue. Replacing a faulty throttle position sensor can cost between $100 and $200, including parts and labor. However, if additional components or wiring repairs are needed, the total repair cost could be higher. It is advisable to consult with a trusted mechanic or repair shop for a more accurate estimate based on the specific circumstances of the vehicle. Keep in mind that diagnosis time and labor rates can vary, so it's essential to factor in these variables when estimating the overall repair costs.

When is the Code Detected?

An excessively high voltage from the Throttle Position Sensor (TPS) '1' is sent to Engine Control Module (ECM).

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Information for Specific Infiniti Models

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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