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Engine-Codes – Nissan – P2138 2005 Nissan Altima Sedan

P2138 2005 Nissan Altima Sedan Code - Accelerator Pedal Position Sensor Circuit Range/Performance

Quick Answer

The P2138 diagnostic trouble code (DTC) for a 2005 Nissan Altima Sedan indicates a problem with the Accelerator Pedal Position Sensor Circuit Range/Performance. Common causes include Faulty accelerator pedal position sensor, Damaged wiring or connectors in the sensor circuit, Malfunctioning ECM. 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
P2138 2005 Nissan Altima Sedan indicates Accelerator Pedal Position Sensor Circuit Range/Performance.
Common causes
Common causes include Faulty accelerator pedal position sensor, Damaged wiring or connectors in the sensor circuit, Malfunctioning ECM.
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 15, 2024
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Code P2138 2005 Nissan Altima Sedan Description

The P2138 diagnostic trouble code (DTC) for a 2005 Nissan Altima Sedan indicates a problem with the Accelerator Pedal Position Sensor Circuit Range/Performance. This code is typically triggered when the Engine Control Module (ECM) detects that the voltage signals from the accelerator pedal position sensor do not fall within the expected range. The accelerator pedal position sensor is a crucial component that communicates the position of the accelerator pedal to the ECM, allowing it to adjust fuel delivery and engine performance accordingly.

OBDII Code P2138 2005 Nissan Altima Sedan - Accelerator Pedal Position Sensor Circuit Range/Performance
P2138 2005 Nissan Altima Sedan Code - Accelerator Pedal Position Sensor Circuit Range/Performance

Common Causes of P2138 2005 Nissan Altima Sedan

  1. Faulty accelerator pedal position sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. Malfunctioning ECM
  4. Issues with the throttle body
  5. Corrosion or contamination in the sensor circuit

Symptoms of P2138 2005 Nissan Altima Sedan

  1. Reduced acceleration and throttle response
  2. Engine hesitation or stalling
  3. Illumination of the Check Engine Light
  4. Limp mode activation
  5. Poor fuel efficiency

How to Fix P2138 2005 Nissan Altima Sedan

  1. Diagnose the issue using a scan tool to retrieve the specific DTC and perform a visual inspection of the accelerator pedal position sensor and related components.
  2. Test the accelerator pedal position sensor using a multimeter to check for proper voltage signals.
  3. Inspect the wiring and connectors for any damage or corrosion, repairing or replacing as necessary.
  4. If the sensor is faulty, replace it with a new one following manufacturer guidelines.
  5. Clear the DTC and perform a test drive to ensure the issue has been resolved.

Cost to Fix P2138 2005 Nissan Altima Sedan

The typical repair costs for addressing a P2138 code on a 2005 Nissan Altima Sedan can range from $200 to $500, depending on the specific cause of the issue and the cost of parts and labor. This estimate includes the cost of a new accelerator pedal position sensor, any necessary wiring repairs, and the labor involved in diagnosing and repairing the problem. It's important to note that prices can vary based on location, vehicle make and model, and the rates of the auto repair shop. It's recommended to obtain quotes from multiple shops to ensure a competitive price for the repair.

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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 P2138 2005 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P2138 in a 2005 Nissan Altima Sedan?

- Common symptoms include reduced engine power, hesitation during acceleration, and the vehicle going into "limp mode" where it may not exceed a certain speed.

2. What causes the OBDII code P2138 in a 2005 Nissan Altima Sedan?

- The code is typically triggered by issues with the accelerator pedal position sensor or its circuit, such as sensor malfunction, wiring problems, or a faulty throttle body.

3. How can I diagnose the OBDII code P2138 in my 2005 Nissan Altima Sedan?

- Diagnosing the issue involves checking the accelerator pedal position sensor's voltage readings, inspecting the wiring for damage, and testing the throttle body for proper functionality.

4. Can I continue driving my 2005 Nissan Altima Sedan with OBDII code P2138?

- It is not recommended to continue driving with this code present, as it can lead to further damage and safety risks. It's best to address the issue promptly.

5. How can I repair OBDII code P2138 in my 2005 Nissan Altima Sedan?

- Repair options may include replacing the accelerator pedal position sensor, repairing or replacing damaged wiring, or cleaning/replacing the throttle body, depending on the root cause of the issue.

6. Will resetting the OBDII code P2138 in my 2005 Nissan Altima Sedan make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue causing the code is not addressed, it is likely to return. Proper diagnosis and repair are recommended.

7. Is the OBDII code P2138 in a 2005 Nissan Altima Sedan a common issue?

- While it may not be extremely common, issues with the accelerator pedal position sensor and related circuits can occur in vehicles, including the 2005 Nissan Altima Sedan.

8. Can a DIY enthusiast fix the OBDII code P2138 in a 2005 Nissan Altima Sedan?

- Depending on their skill level and access to tools, a DIY enthusiast may be able to diagnose and repair the issue themselves, especially if it involves basic tasks like sensor replacement or wiring repairs.

9. How much does it typically cost to repair OBDII code P2138 in a 2005 Nissan Altima Sedan?

- The cost of repairs can vary based on the specific cause of the issue, but it may range from $200 to $500 or more, including parts and labor.

10. Will OBDII code P2138 cause my 2005 Nissan Altima Sedan to fail an emissions test?

- Yes, the presence of this code may cause your vehicle to fail an emissions test, as it indicates a problem with the accelerator pedal position sensor circuit, which can affect emissions control systems.

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