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Engine-Codes – Nissan – P0123 2004 Nissan Altima Sedan

P0123 2004 Nissan Altima Sedan Code - Throttle Position Sensor/Switch '1' Circuit High Input

Quick Answer

The P0123 diagnostic trouble code (DTC) for a 2004 Nissan Altima Sedan indicates a Throttle Position Sensor/Switch '1' Circuit High Input. Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the TPS circuit, Corrosion or contamination in the TPS 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 2004 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, Corrosion or contamination in the TPS 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 Sep 10, 2024
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Code P0123 2004 Nissan Altima Sedan Description

The P0123 diagnostic trouble code (DTC) for a 2004 Nissan Altima Sedan indicates a Throttle Position Sensor/Switch '1' Circuit High Input. This means that the powertrain control module (PCM) has detected a higher than expected voltage from the throttle position sensor (TPS) or throttle position switch. The TPS is a vital component of the engine management system, as it informs the PCM about the position of the throttle blade. This information is crucial for the PCM to calculate the appropriate air-fuel mixture and ignition timing for optimal engine performance.

OBDII Code P0123 2004 Nissan Altima Sedan - Throttle Position Sensor/Switch '1' Circuit High Input
P0123 2004 Nissan Altima Sedan Code - Throttle Position Sensor/Switch '1' Circuit High Input

Common Causes of P0123 2004 Nissan Altima Sedan

  1. Faulty throttle position sensor
  2. Damaged wiring or connectors in the TPS circuit
  3. Corrosion or contamination in the TPS sensor
  4. Malfunctioning PCM
  5. Incorrect TPS adjustment

Symptoms of P0123 2004 Nissan Altima Sedan

  1. Hesitation or jerking during acceleration
  2. Rough idling or stalling
  3. Reduced fuel efficiency
  4. Check Engine Light illuminated on the dashboard
  5. Poor throttle response

How to Fix P0123 2004 Nissan Altima Sedan

  1. Begin by diagnosing the issue using a scan tool to confirm the P0123 code and identify the specific component causing the problem.
  2. Inspect the wiring and connectors in the TPS circuit for any damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test the throttle position sensor using a multimeter to check for proper voltage output. Replace the sensor if it fails to meet specifications.
  4. Reset the PCM and clear the trouble code from the system memory to see if the issue persists.
  5. Realign or adjust the TPS if necessary to ensure proper throttle position readings.

Cost to Fix P0123 2004 Nissan Altima Sedan

The typical repair costs for addressing a P0123 code in a 2004 Nissan Altima Sedan can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor. It's essential to factor in the diagnosis time and labor rates at auto repair shops, which can vary based on location and shop rates. In general, most auto repair shops charge between $80 and $150 per hour for labor, so it's advisable to obtain quotes from multiple shops to compare prices and ensure a fair estimate.

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 2004 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P0123 on a 2004 Nissan Altima Sedan?

- Common symptoms include issues with acceleration, poor engine performance, stalling, and possibly a check engine light illuminated on the dashboard.

2. What does the OBDII code P0123 indicate in a 2004 Nissan Altima Sedan?

- The code P0123 indicates a high input signal from the throttle position sensor/switch '1' circuit in the vehicle.

3. What are the possible causes of OBDII code P0123 on a 2004 Nissan Altima Sedan?

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

4. How can I diagnose the OBDII code P0123 on my 2004 Nissan Altima Sedan?

- You can diagnose the code P0123 by using an OBDII scanner to retrieve the code, checking the throttle position sensor for proper operation, inspecting the wiring and connectors for any damage, and testing the ECM if necessary.

5. Can I drive my 2004 Nissan Altima Sedan with OBDII code P0123?

- It is not recommended to drive the vehicle with code P0123 as it can lead to poor engine performance and potentially dangerous driving conditions. It is best to address the issue promptly.

6. How can I repair OBDII code P0123 on a 2004 Nissan Altima Sedan?

- To repair code P0123, you may need to replace the throttle position sensor, repair any damaged wiring or connectors, or reprogram the engine control module (ECM) if necessary.

7. Are there any DIY tips for fixing OBDII code P0123 on a 2004 Nissan Altima Sedan?

- While some tasks like checking wiring and connectors can be done by DIY enthusiasts, it is recommended to have a qualified mechanic diagnose and repair the issue due to the complexity of the throttle position sensor system.

8. How much does it cost to fix OBDII code P0123 on a 2004 Nissan Altima Sedan?

- The cost of fixing code P0123 can vary depending on the root cause of the issue, replacement parts needed, and labor costs. It is advisable to get estimates from local auto repair shops for an accurate cost assessment.

9. Will resetting the OBDII code P0123 on my 2004 Nissan Altima Sedan make it go away permanently?

- Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing code P0123 is not addressed, the code is likely to reappear. It is important to diagnose and fix the root cause of the problem.

10. How often does OBDII code P0123 occur in 2004 Nissan Altima Sedans?

- Code P0123 related to the throttle position sensor '1' circuit high input can occur in 2004 Nissan Altima Sedans due to sensor wear, wiring issues, or ECM malfunctions, but its frequency can vary depending on the vehicle's maintenance history and driving conditions.

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