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P2128 2009 Nissan Altima Sedan Code - Accelerator Pedal Position Sensor Circuit

Quick Answer

The P2128 diagnostic trouble code (DTC) in a 2009 Nissan Altima Sedan indicates a problem with the Accelerator Pedal Position Sensor Circuit. Common causes include Faulty accelerator pedal position sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or poor connections in the sensor circuit. 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 Altima Sedan indicates Accelerator Pedal Position Sensor Circuit.
Common causes
Common causes include Faulty accelerator pedal position sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or poor connections in the sensor circuit.
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 16, 2024
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Code P2128 2009 Nissan Altima Sedan Description

The P2128 diagnostic trouble code (DTC) in a 2009 Nissan Altima Sedan indicates a problem with the Accelerator Pedal Position Sensor Circuit. This sensor is responsible for monitoring the position of the accelerator pedal and sending this information to the Engine Control Module (ECM). The ECM uses this data to determine the appropriate fuel delivery and ignition timing for optimal engine performance.

OBDII Code P2128 2009 Nissan Altima Sedan - Accelerator Pedal Position Sensor Circuit
P2128 2009 Nissan Altima Sedan Code - Accelerator Pedal Position Sensor Circuit

Common Causes of P2128 2009 Nissan Altima Sedan

  1. Faulty accelerator pedal position sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. Corrosion or poor connections in the sensor circuit
  4. ECM malfunction
  5. Environmental factors such as moisture or debris affecting sensor operation

Symptoms of P2128 2009 Nissan Altima Sedan

  1. Reduced engine power
  2. Delayed throttle response
  3. Engine stalling
  4. Check Engine Light illuminated
  5. Poor fuel efficiency

How to Fix P2128 2009 Nissan Altima Sedan

  1. Diagnose the issue using a scan tool to confirm the P2128 code and identify the specific cause.
  2. Inspect the accelerator pedal position sensor, wiring, and connectors 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 accelerator pedal position sensor if it is found to be faulty.
  5. Clear the DTC and perform a test drive to ensure the issue has been resolved.

Cost to Fix P2128 2009 Nissan Altima Sedan

The cost of repairing the Accelerator Pedal Position Sensor Circuit in a 2009 Nissan Altima Sedan can vary depending on the specific cause of the issue. On average, the replacement sensor itself can range from $50 to $150, while labor costs can add an additional $100 to $200. Overall, the total repair cost can be estimated to be between $150 and $350. It is important to note that these are rough estimates, and actual costs may vary based on factors such as location, labor rates, and any additional parts or services required. It is recommended to consult with a qualified mechanic or auto repair shop for a more accurate cost estimate.

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 Altima Sedan Code

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

The common symptoms of code P2128 include a check engine light illuminated on the dashboard, reduced engine power, hesitation or stalling during acceleration, and potential issues with the vehicle's throttle response.

2. What does OBDII code P2128 indicate in a 2009 Nissan Altima Sedan?

Code P2128 indicates a malfunction in the Accelerator Pedal Position Sensor Circuit in the 2009 Nissan Altima Sedan. It means there is a problem with the sensor responsible for monitoring the position of the accelerator pedal.

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

Common causes of code P2128 in a 2009 Nissan Altima Sedan include a faulty accelerator pedal position sensor, damaged wiring or connectors in the sensor circuit, or issues with the vehicle's electronic control module (ECM).

4. How can I diagnose OBDII code P2128 in my 2009 Nissan Altima Sedan?

Diagnosing code P2128 involves using an OBDII scanner to retrieve the specific error code, inspecting the accelerator pedal position sensor and its wiring for any visible damage, and testing the sensor's voltage and resistance to determine if it is functioning correctly.

5. Can I continue to drive my 2009 Nissan Altima Sedan with OBDII code P2128?

It is not recommended to drive your vehicle with OBDII code P2128 present, as it can lead to performance issues, reduced engine power, and potentially unsafe driving conditions. It is advised to address the issue promptly to avoid further damage.

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

Repairing code P2128 may involve replacing the accelerator pedal position sensor, repairing or replacing damaged wiring or connectors, and resetting the error code using an OBDII scanner. It is recommended to consult a professional mechanic for proper diagnosis and repair.

7. Will resetting the OBDII code P2128 in my 2009 Nissan Altima Sedan fix the issue?

Resetting the OBDII code P2128 may temporarily clear the error code, but if the underlying issue with the accelerator pedal position sensor circuit is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of the problem.

8. How much does it cost to repair OBDII code P2128 in a 2009 Nissan Altima Sedan?

The cost of repairing code P2128 can vary depending on the specific cause of the issue, the labor rates of the repair shop, and the cost of any necessary parts. It is recommended to obtain quotes from multiple mechanics to compare prices.

9. Can a DIY enthusiast fix OBDII code P2128 in a 2009 Nissan Altima Sedan?

While some DIY enthusiasts may have the skills to diagnose and repair OBDII code P2128, this repair can be complex and may require specialized tools and knowledge. It is recommended to consult a professional mechanic for proper diagnosis and repair.

10. How often does OBDII code P2128 occur in a 2009 Nissan Altima Sedan?

Code P2128 is a relatively uncommon OBDII code in a 2009 Nissan Altima Sedan, but it can occur due to various factors such as sensor wear, wiring issues, or electronic control module faults. Regular maintenance and prompt repairs can help prevent this code from appearing.

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