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P2128 2011 Nissan Altima Sedan Code - Accelerator Pedal Position Sensor Circuit

Quick Answer

The P2128 diagnostic trouble code (DTC) for a 2011 Nissan Altima Sedan relates to the Accelerator Pedal Position Sensor Circuit. Common causes include Faulty accelerator pedal position sensor, Damaged wiring or connectors in the circuit, Corrosion in the sensor or wiring. 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 2011 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 circuit, Corrosion in the sensor or wiring.
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 17, 2024
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Code P2128 2011 Nissan Altima Sedan Description

The P2128 diagnostic trouble code (DTC) for a 2011 Nissan Altima Sedan relates to the Accelerator Pedal Position Sensor Circuit. This code indicates that there is a malfunction in the circuit that controls the accelerator pedal position sensor. The accelerator pedal position sensor is a vital component of the vehicle's electronic throttle control system. It is responsible for sending signals to the engine control module (ECM) regarding the position of the accelerator pedal. This information is used by the ECM to determine the appropriate fuel delivery and throttle response.

OBDII Code P2128 2011 Nissan Altima Sedan - Accelerator Pedal Position Sensor Circuit
P2128 2011 Nissan Altima Sedan Code - Accelerator Pedal Position Sensor Circuit

Common Causes of P2128 2011 Nissan Altima Sedan

  1. Faulty accelerator pedal position sensor
  2. Damaged wiring or connectors in the circuit
  3. Corrosion in the sensor or wiring
  4. ECM software issues
  5. Electrical issues in the throttle control system

Symptoms of P2128 2011 Nissan Altima Sedan

  1. Reduced engine power
  2. Hesitation or stalling when accelerating
  3. Rough idling
  4. Vehicle going into limp mode
  5. Check Engine Light illuminated

How to Fix P2128 2011 Nissan Altima Sedan

  1. Begin by diagnosing the issue using a scan tool to confirm the P2128 code and identify the specific cause.
  2. Inspect the wiring harness and connectors for any damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test the accelerator pedal position sensor for proper operation. Replace if faulty.
  4. Clear the DTC and reset the ECM to see if the code reappears after repairs.
  5. Test drive the vehicle to ensure that the issue has been resolved and that the symptoms associated with the P2128 code have been eliminated.

Cost to Fix P2128 2011 Nissan Altima Sedan

The typical repair costs for addressing a P2128 code in a 2011 Nissan Altima Sedan can range from $200 to $500, including parts and labor. However, it's important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Auto repair shops commonly charge between $80 and $150 per hour for labor. Rates may be higher in metropolitan areas or at dealerships, while independent shops often charge less. It's advisable to check local rates for a more precise 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 2011 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P2128 in a 2011 Nissan Altima Sedan?

Symptoms may include reduced engine power, unresponsive throttle, illuminated Check Engine Light, and limited acceleration capability.

2. What is the main cause of OBDII code P2128 in a 2011 Nissan Altima Sedan?

The primary cause is a malfunction or failure in the accelerator pedal position sensor circuit.

3. How can I diagnose the issue related to OBDII code P2128 in my 2011 Nissan Altima Sedan?

Diagnosis involves checking the wiring, connections, and components related to the accelerator pedal position sensor for any damage or faults using a diagnostic scanner.

4. Can a faulty accelerator pedal position sensor be repaired, or does it need to be replaced?

In most cases, a faulty accelerator pedal position sensor will need to be replaced to resolve the issue and clear the OBDII code P2128.

5. Are there any DIY repair tips for addressing OBDII code P2128 in a 2011 Nissan Altima Sedan?

DIY repair tips include checking for loose connections, inspecting the sensor for physical damage, and ensuring proper wiring connections before considering sensor replacement.

6. Will driving with OBDII code P2128 in a 2011 Nissan Altima Sedan cause further damage to the vehicle?

Continued driving with this issue may result in reduced performance, potential safety hazards, and possible damage to other engine components if left unresolved.

7. How much does it typically cost to repair OBDII code P2128 in a 2011 Nissan Altima Sedan at a mechanic or dealership?

Repair costs can vary depending on the extent of the issue, but generally, replacing the accelerator pedal position sensor may range from $150 to $300, including parts and labor.

8. Can resetting the OBDII system clear the P2128 code temporarily in a 2011 Nissan Altima Sedan?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue with the accelerator pedal position sensor circuit remains unresolved, the code is likely to reappear.

9. Is it safe to drive my 2011 Nissan Altima Sedan with OBDII code P2128 if I experience no noticeable symptoms?

It is not recommended to drive with any unresolved OBDII code, as it may lead to potential safety risks and further damage to the vehicle over time.

10. How long does it typically take to repair OBDII code P2128 in a 2011 Nissan Altima Sedan?

The repair time can vary based on the technician's experience and workload, but replacing the accelerator pedal position sensor usually takes around 1-2 hours at a mechanic's shop.

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