AutoCodes – Nissan – P2128 2009 Nissan Altima Sedan

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

Quick Answer

The Accelerator Pedal Position (APP) sensor is installed on the upper end of the accelerator pedal assembly. Common causes include Faulty Accelerator Pedal Position (APP) Sensor, Accelerator Pedal Position (APP) Sensor harness is open or shorted, Accelerator Pedal Position (APP) Sensor circuit poor electrical connection. 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 (APP) Sensor, Accelerator Pedal Position (APP) Sensor harness is open or shorted, Accelerator Pedal Position (APP) Sensor circuit poor electrical connection.
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.

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Code Popularity 2,081

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2128 2009 Nissan Altima Sedan Description

The Accelerator Pedal Position (APP) sensor is installed on the upper end of the accelerator pedal assembly. The sensor detects the accelerator position and sends a signal to the Engine Control Module (ECM). Accelerator pedal position sensor has two sensors. These sensors are a kind of potentiometers which transform the accelerator pedal position into an output voltage and emit the voltage signal to the ECM. In addition, these sensors detect the opening and closing speed of the accelerator pedal and feed the voltage signals to the ECM. The ECM judges the current opening angle of the accelerator pedal from these signals and controls the throttle control motor based on these signals. Idle position of the accelerator pedal is determined by the ECM receiving the signal from the accelerator pedal position sensor. The ECM uses this signal for the engine operation such as fuel cut.

OBDII Code P2128 2009 Nissan Altima Sedan - Accelerator Pedal Position Sensor Circuit - AutoCodes.com — P2128 2009 Nissan Altima Sedan Code - Accelerator Pedal Position Sensor Circuit

What does this mean?

What are the Possible Causes of the DTC P2128 2009 Nissan Altima Sedan?

Faulty Accelerator Pedal Position (APP) Sensor
Accelerator Pedal Position (APP) Sensor harness is open or shorted
Accelerator Pedal Position (APP) Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)
Electric Throttle Control Actuator(Throttle Body)

How to Fix the DTC P2128 2009 Nissan Altima Sedan?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2128 2009 Nissan Altima Sedan code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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.