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Engine-Codes – Nissan – P0123 2003 Nissan Altima Sedan

P0123 2003 Nissan Altima Sedan Code - Throttle Position Sensor/Switch '1' Circuit High Input

Quick Answer

The P0123 diagnostic trouble code (DTC) indicates that there is a high input signal in the throttle position sensor or switch circuit '1' in a 2003 Nissan Altima Sedan. Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the TPS circuit, Malfunctioning ECU. 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 2003 Nissan Altima Sedan 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, Malfunctioning ECU.
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 08, 2024
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Code P0123 2003 Nissan Altima Sedan Description

The P0123 diagnostic trouble code (DTC) indicates that there is a high input signal in the throttle position sensor or switch circuit '1' in a 2003 Nissan Altima Sedan. The throttle position sensor (TPS) is a crucial component that monitors the position of the throttle valve and sends signals to the engine control unit (ECU) to adjust fuel injection and ignition timing. When the TPS circuit reports a high input signal, it means that the voltage being sent to the ECU is higher than the specified range, causing potential issues with engine performance and drivability.

OBDII Code P0123 2003 Nissan Altima Sedan - Throttle Position Sensor/Switch '1' Circuit High Input
P0123 2003 Nissan Altima Sedan Code - Throttle Position Sensor/Switch '1' Circuit High Input

Common Causes of P0123 2003 Nissan Altima Sedan

  1. Faulty throttle position sensor
  2. Damaged wiring or connectors in the TPS circuit
  3. Malfunctioning ECU
  4. Issues with the throttle body
  5. Accelerator pedal position sensor failure

Symptoms of P0123 2003 Nissan Altima Sedan

  1. Rough idling or unstable engine speed
  2. Delayed or sluggish throttle response
  3. Poor acceleration or lack of power
  4. Engine stalling or difficulty starting
  5. Illumination of the Check Engine Light

How to Fix P0123 2003 Nissan Altima Sedan

  1. Perform a comprehensive diagnostic scan to confirm the P0123 code and identify the specific cause of the high input signal.
  2. Inspect the throttle position sensor, wiring, and connectors for any signs of damage or corrosion. Replace any faulty components as needed.
  3. Test the throttle body and accelerator pedal position sensor for proper functionality and calibration. Adjust or replace these components if necessary.
  4. Clear the DTC from the ECU memory and perform a test drive to ensure that the issue has been resolved.
  5. If the problem persists, consult a professional mechanic or dealership for further troubleshooting and repair.

Cost to Fix P0123 2003 Nissan Altima Sedan

The typical repair costs for addressing a P0123 code in a 2003 Nissan Altima Sedan can range from $100 to $300, depending on the specific cause of the issue and the cost of replacement parts. This estimate includes labor charges, which can vary between $80 and $150 per hour at most auto repair shops. It's advisable to inquire about specific diagnosis time and labor rates in your area to obtain a more accurate estimate for this repair.

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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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 2003 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P0123 in a 2003 Nissan Altima Sedan?

The common symptoms of OBDII code P0123 in a 2003 Nissan Altima Sedan may include issues such as poor acceleration, stalling, rough idling, and possible engine hesitation.

2. What does the OBDII code P0123 indicate in a 2003 Nissan Altima Sedan?

OBDII code P0123 in a 2003 Nissan Altima Sedan indicates a potential problem with the Throttle Position Sensor/Switch '1' Circuit High Input.

3. What are the possible causes of OBDII code P0123 in a 2003 Nissan Altima Sedan?

Possible causes of OBDII code P0123 in a 2003 Nissan Altima Sedan include a faulty throttle position sensor, damaged wiring or connectors related to the sensor, or issues with the engine control module.

4. How can I diagnose the Throttle Position Sensor/Switch '1' Circuit High Input issue in my 2003 Nissan Altima Sedan?

Diagnosing the Throttle Position Sensor/Switch '1' Circuit High Input issue in a 2003 Nissan Altima Sedan involves using an OBDII scanner to read the trouble code and then testing the throttle position sensor and its related circuits for proper voltage and continuity.

5. Can I drive my 2003 Nissan Altima Sedan with OBDII code P0123?

It is not recommended to drive your 2003 Nissan Altima Sedan with OBDII code P0123, as it can lead to poor engine performance and potential safety hazards. It is best to address the issue promptly.

6. How can I repair OBDII code P0123 in my 2003 Nissan Altima Sedan?

Repairing OBDII code P0123 in a 2003 Nissan Altima Sedan may involve replacing the throttle position sensor, repairing or replacing damaged wiring or connectors, or resetting the engine control module after the issue is resolved.

7. Is it necessary to reset the OBDII code P0123 after repairing it in a 2003 Nissan Altima Sedan?

Yes, it is recommended to reset the OBDII code P0123 after repairing the issue in a 2003 Nissan Altima Sedan. This can be done using an OBDII scanner or by disconnecting the car's battery for a few minutes.

8. Can a DIY enthusiast fix OBDII code P0123 in a 2003 Nissan Altima Sedan?

Depending on the individual's mechanical skills and knowledge, a DIY enthusiast may be able to fix OBDII code P0123 in a 2003 Nissan Altima Sedan by following repair guides and using the necessary tools.

9. How long does it typically take to repair OBDII code P0123 in a 2003 Nissan Altima Sedan?

The time it takes to repair OBDII code P0123 in a 2003 Nissan Altima Sedan can vary depending on the exact cause of the issue and the individual's experience. It may take anywhere from 30 minutes to a few hours to complete the repair.

10. What should I do if OBDII code P0123 persists in my 2003 Nissan Altima Sedan after repair?

If OBDII code P0123 persists in your 2003 Nissan Altima Sedan after repair, it is recommended to recheck the throttle position sensor, wiring, and connectors for any missed issues. Consulting a professional mechanic for further diagnosis may also be necessary.

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