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Engine-Codes – Nissan – P0123 2008 Nissan Maxima

P0123 2008 Nissan Maxima Code - Throttle Position Sensor/Switch '1' Circuit High Input

Quick Answer

The P0123 diagnostic trouble code (DTC) for a 2008 Nissan Maxima refers to the Throttle Position Sensor/Switch '1' Circuit High Input. Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the TPS circuit, Malfunctioning PCM. 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 2008 Nissan Maxima 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 PCM.
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 2008 Nissan Maxima Description

The P0123 diagnostic trouble code (DTC) for a 2008 Nissan Maxima refers to the Throttle Position Sensor/Switch '1' Circuit High Input. This code is triggered when the powertrain control module (PCM) detects that the voltage signal from the throttle position sensor (TPS) has exceeded the maximum allowable limit. The TPS is a crucial component that monitors the position of the throttle valve, allowing the PCM to adjust fuel delivery and ignition timing accordingly. When the TPS sends a high input signal, it can lead to a variety of issues affecting the vehicle's performance and drivability.

OBDII Code P0123 2008 Nissan Maxima - Throttle Position Sensor/Switch '1' Circuit High Input
P0123 2008 Nissan Maxima Code - Throttle Position Sensor/Switch '1' Circuit High Input

Common Causes of P0123 2008 Nissan Maxima

  1. Faulty throttle position sensor
  2. Damaged wiring or connectors in the TPS circuit
  3. Malfunctioning PCM
  4. Mechanical issue with the throttle body
  5. Corrosion or contamination in the TPS circuit

Symptoms of P0123 2008 Nissan Maxima

  1. Engine hesitation during acceleration
  2. Rough idling or stalling
  3. Reduced fuel efficiency
  4. Check Engine Light illuminated on the dashboard
  5. Difficulty maintaining a consistent speed

How to Fix P0123 2008 Nissan Maxima

  1. Begin by verifying the code with a diagnostic scan tool and ensuring it is indeed the Throttle Position Sensor/Switch '1' Circuit High Input code.
  2. Inspect the TPS wiring and connectors for any damage or corrosion. Repair or replace as necessary.
  3. Test the TPS using a multimeter to check for proper voltage output. Replace the TPS if it is found to be faulty.
  4. Clear the code from the PCM's memory using the diagnostic scan tool.
  5. Test drive the vehicle to ensure the issue has been resolved and the code does not return.

Cost to Fix P0123 2008 Nissan Maxima

The cost of repairing a P0123 code on a 2008 Nissan Maxima can vary depending on the specific cause of the issue. On average, the cost of replacing a throttle position sensor can range from $100 to $200, including parts and labor. However, if additional repairs or diagnostic work are needed, the total cost could be higher. It's important to consult with a qualified mechanic or auto repair shop for an accurate estimate based on the specific circumstances of the vehicle. Keep in mind that labor rates at auto repair shops can vary, so it's advisable to check local rates for a more precise cost 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 2008 Nissan Maxima Code

1. What are the common symptoms of OBDII code P0123 in a 2008 Nissan Maxima?

- Common symptoms include poor acceleration, rough idling, stalling, and potential issues with the vehicle's transmission shifting.

2. What does the OBDII code P0123 indicate in a 2008 Nissan Maxima?

- The code P0123 indicates a high input signal from the throttle position sensor or switch '1' circuit in the vehicle's engine control module.

3. What are the possible causes of OBDII code P0123 in a 2008 Nissan Maxima?

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

4. How can I diagnose the issue related to OBDII code P0123 in my 2008 Nissan Maxima?

- You can use a scan tool to read the code and perform a visual inspection of the throttle position sensor, wiring, and connectors. Testing the sensor's voltage output can also help diagnose the problem.

5. Can I drive my 2008 Nissan Maxima with OBDII code P0123?

- It is not recommended to drive the vehicle with code P0123, as it can lead to further damage and potential safety hazards. It is best to address the issue promptly.

6. How can I repair OBDII code P0123 in my 2008 Nissan Maxima?

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

7. Will resetting the OBDII code P0123 in a 2008 Nissan Maxima fix the issue?

- Resetting the code may temporarily clear the warning light, but it will not fix the underlying problem causing the high input signal from the throttle position sensor.

8. How much does it cost to repair OBDII code P0123 in a 2008 Nissan Maxima?

- The cost of repair can vary depending on the specific issue causing the code. Replacing a throttle position sensor can cost between $100 to $200, while repairing wiring or connectors may involve additional labor costs.

9. Is it possible to prevent OBDII code P0123 in a 2008 Nissan Maxima?

- Regular maintenance and inspections of the throttle position sensor, wiring, and connectors can help prevent issues that may trigger code P0123. Driving responsibly and avoiding sudden throttle changes may also help prevent sensor damage.

10. Can a DIY enthusiast fix OBDII code P0123 in a 2008 Nissan Maxima?

- Depending on the DIY enthusiast's skill level and access to tools, some may be able to replace the throttle position sensor or repair wiring themselves. However, complex issues may require professional diagnosis and repair.

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