AutoCodes – Nissan – P2128 2004 Nissan Altima Sedan

P2128 2004 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 2004 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 2,739

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 2004 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 2004 Nissan Altima Sedan - Accelerator Pedal Position Sensor Circuit - AutoCodes.com — P2128 2004 Nissan Altima Sedan Code - Accelerator Pedal Position Sensor Circuit

What does this mean?

What are the Possible Causes of the DTC P2128 2004 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 2004 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 2004 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.

Need more information about the P2128 2004 Nissan Altima Sedan code?

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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 2004 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P2128 in a 2004 Nissan Altima Sedan?

The common symptoms of code P2128 include a lit Check Engine light, reduced engine power, acceleration issues, and the vehicle going into limp mode.

2. What causes OBDII code P2128 in a 2004 Nissan Altima Sedan?

Code P2128 is typically triggered by a malfunction in the accelerator pedal position sensor circuit, which may be due to a faulty sensor, wiring issues, or a poor connection.

3. How can I diagnose the cause of OBDII code P2128 in my 2004 Nissan Altima Sedan?

To diagnose code P2128, you can use an OBDII scanner to retrieve the code, visually inspect the accelerator pedal sensor and its wiring, perform a voltage test on the sensor, and check for any loose connections.

4. Can I continue driving my 2004 Nissan Altima Sedan with OBDII code P2128?

It is not recommended to continue driving your vehicle with code P2128 as it can lead to further damage and potentially unsafe driving conditions due to the reduced engine power and acceleration issues.

5. How do I repair OBDII code P2128 in a 2004 Nissan Altima Sedan?

To repair code P2128, you may need to replace the accelerator pedal position sensor, repair any damaged wiring, or fix loose connections. It is advisable to seek professional help for accurate diagnosis and repair.

6. Is it possible to reset OBDII code P2128 in a 2004 Nissan Altima Sedan without fixing the underlying issue?

While you can clear the code using an OBDII scanner, it is not recommended as the issue causing the code will persist, and the Check Engine light is likely to come back on.

7. Can a DIY enthusiast fix OBDII code P2128 in a 2004 Nissan Altima Sedan?

Depending on your automotive knowledge and skills, you may be able to fix code P2128 yourself by following repair guides or videos. However, professional assistance is recommended for accurate diagnosis and repair.

8. How much does it cost to repair OBDII code P2128 in a 2004 Nissan Altima Sedan?

The cost of repairing code P2128 can vary depending on the cause of the issue, the parts needed for replacement, and labor costs. It is advisable to obtain quotes from different mechanics or repair shops.

9. Will fixing OBDII code P2128 improve the performance of my 2004 Nissan Altima Sedan?

Fixing code P2128 can help restore the proper function of the accelerator pedal position sensor, resulting in improved engine performance, smoother acceleration, and the elimination of limp mode.

10. How often does OBDII code P2128 occur in 2004 Nissan Altima Sedans?

While code P2128 is not extremely common in 2004 Nissan Altima Sedans, it can still occur due to sensor or wiring issues. Regular maintenance and prompt diagnosis of any Check Engine lights can help prevent this code from appearing.