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P2128 2009 Nissan Pathfinder Code - Accelerator Pedal Position Sensor Circuit

Quick Answer

The P2128 diagnostic trouble code indicates a problem with the accelerator pedal position sensor circuit in a 2009 Nissan Pathfinder. Common causes include Faulty accelerator pedal position sensor, Wiring or connector issues in the sensor circuit, Corrosion or damage to sensor components. 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
P2128 2009 Nissan Pathfinder indicates Accelerator Pedal Position Sensor Circuit.
Common causes
Common causes include Faulty accelerator pedal position sensor, Wiring or connector issues in the sensor circuit, Corrosion or damage to sensor components.
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 05, 2024
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Code P2128 2009 Nissan Pathfinder Description

The P2128 diagnostic trouble code indicates a problem with the accelerator pedal position sensor circuit in a 2009 Nissan Pathfinder. This sensor is responsible for monitoring the position of the accelerator pedal and sending this information to the engine control module (ECM) to adjust fuel and air intake accordingly. When there is a fault in this circuit, it can lead to issues with engine performance, fuel efficiency, and overall drivability of the vehicle. If left unaddressed, it could potentially lead to further damage to other engine components.

OBDII Code P2128 2009 Nissan Pathfinder - Accelerator Pedal Position Sensor Circuit
P2128 2009 Nissan Pathfinder Code - Accelerator Pedal Position Sensor Circuit

Common Causes of P2128 2009 Nissan Pathfinder

  1. Faulty accelerator pedal position sensor.
  2. Wiring or connector issues in the sensor circuit.
  3. Corrosion or damage to sensor components.
  4. ECM software or hardware problems.
  5. Mechanical issues with the accelerator pedal assembly.

Symptoms of P2128 2009 Nissan Pathfinder

  1. Reduced acceleration or lack of response when pressing the accelerator pedal.
  2. Engine stalling or hesitation during acceleration.
  3. Check Engine Light illuminated on the dashboard.
  4. Poor fuel efficiency.
  5. Rough idling or uneven engine performance.

How to Fix P2128 2009 Nissan Pathfinder

  1. Begin by diagnosing the exact cause of the issue using a diagnostic scanner to read the stored trouble codes.
  2. Inspect the accelerator pedal position sensor and its wiring for any visible damage or corrosion.
  3. Test the sensor's resistance and voltage output to determine if it is functioning correctly.
  4. Replace the faulty sensor or repair any damaged wiring or connectors.
  5. Clear the trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P2128 2009 Nissan Pathfinder

The cost of repairing the accelerator pedal position sensor circuit in a 2009 Nissan Pathfinder can range from $150 to $400, including parts and labor. However, this is just an estimate, and actual costs may vary depending on the specific diagnosis time and labor rates at the auto repair shop. It's recommended to get quotes from multiple shops and compare prices before proceeding with the repair.

When is the Code Detected?

An excessively low voltage from the APP sensor 2 is sent to 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 P2128 2009 Nissan Pathfinder Code

1. What are the common symptoms of OBDII code P2128 in a 2009 Nissan Pathfinder?

- Common symptoms include a lack of throttle response, reduced engine power, and the illumination of the Check Engine light.

2. What does the OBDII code P2128 indicate in a 2009 Nissan Pathfinder?

- OBDII code P2128 specifically relates to an issue with the Accelerator Pedal Position Sensor Circuit in the vehicle.

3. What are the possible causes of OBDII code P2128 in a 2009 Nissan Pathfinder?

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

4. How can I diagnose the OBDII code P2128 in my 2009 Nissan Pathfinder?

- Diagnosis typically involves using an OBDII scanner to retrieve the trouble code, checking the wiring and connectors for damage, and testing the accelerator pedal position sensor for proper function.

5. Can I drive my 2009 Nissan Pathfinder with OBDII code P2128?

- It is not recommended to drive the vehicle with OBDII code P2128 as it can lead to unsafe driving conditions due to reduced engine power and throttle response.

6. How can I repair OBDII code P2128 in my 2009 Nissan Pathfinder?

- Repair options may include replacing the accelerator pedal position sensor, repairing damaged wiring or connectors, or reprogramming the engine control module (ECM).

7. Is it possible to reset OBDII code P2128 in a 2009 Nissan Pathfinder?

- Resetting the code can be done using an OBDII scanner, but it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. Are there any DIY tips for fixing OBDII code P2128 in a 2009 Nissan Pathfinder?

- While some may attempt to replace the accelerator pedal position sensor themselves, it is recommended to consult a professional mechanic for proper diagnosis and repair.

9. Can a malfunctioning accelerator pedal position sensor cause other issues in a 2009 Nissan Pathfinder?

- Yes, a faulty accelerator pedal position sensor can lead to erratic throttle response, poor fuel efficiency, and potential drivability issues in the vehicle.

10. How much does it typically cost to repair OBDII code P2128 in a 2009 Nissan Pathfinder?

- Repair costs can vary depending on the exact cause of the issue, but replacing the accelerator pedal position sensor can range from $100 to $300, not including labor.

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