AutoCodes – Nissan – P2128 2009 Nissan Sentra

P2128 2009 Nissan Sentra 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 Sentra 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 1,818

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 Sentra 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 Sentra - Accelerator Pedal Position Sensor Circuit - AutoCodes.com — P2128 2009 Nissan Sentra Code - Accelerator Pedal Position Sensor Circuit

What does this mean?

What are the Possible Causes of the DTC P2128 2009 Nissan Sentra?

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 Sentra?

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 Sentra 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 2009 Nissan Sentra 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 2009 Nissan Sentra Code

What does OBDII code P2128 mean for a 2009 Nissan Sentra?

OBDII code P2128 indicates a problem with the accelerator pedal position sensor circuit, specifically that the voltage signal is out of the expected range.

What are common symptoms of OBDII code P2128?

Common symptoms include a check engine light, reduced engine power, unresponsive acceleration, and possible stalling during driving.

What could cause the P2128 code to trigger?

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

How can I diagnose the P2128 code?

To diagnose the P2128 code, start by using an OBDII scanner to confirm the code, then visually inspect the accelerator pedal position sensor and its wiring for damage. Testing the sensor's voltage output while moving the pedal can also help identify issues.

What repairs are typically needed to fix the P2128 code?

Repairs may involve replacing the accelerator pedal position sensor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the ECM if it is found to be faulty.

Can I drive my 2009 Nissan Sentra with the P2128 code?

While you can drive the vehicle, it is not recommended due to potential reduced power and responsiveness, which can pose safety risks.

How much does it typically cost to repair the P2128 code?

Repair costs can vary widely but typically range from $100 to $400 depending on whether you need to replace the sensor, repair wiring, or address other related issues.

Will clearing the P2128 code fix the problem?

Clearing the code may temporarily turn off the check engine light, but it will not fix the underlying issue; the code is likely to return if the problem persists.

Is the P2128 code specific to certain vehicles?

While P2128 is common in many vehicles, it is not exclusive to the 2009 Nissan Sentra; it can appear in various makes and models with similar accelerator pedal position sensor configurations.