AutoCodes – GMC – P2128 2016 GMC Sierra

P2128 2016 GMC Sierra Code - Accelerator Pedal Position Sensor 2 Circuit High Voltage

Quick Answer

The Accelerator Pedal Assembly contains 2 Accelerator Pedal Position (APP) sensors. Common causes include Faulty Accelerator Pedal Position Sensor, Accelerator Pedal Position Sensor harness is open or shorted, Accelerator Pedal Position 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 2016 GMC Sierra indicates Accelerator Pedal Position Sensor 2 Circuit High Voltage.
Common causes: Common causes include Faulty Accelerator Pedal Position Sensor, Accelerator Pedal Position Sensor harness is open or shorted, Accelerator Pedal Position 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 241

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 Sep 08, 2022

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P2128 2016 GMC Sierra Description

The Accelerator Pedal Assembly contains 2 Accelerator Pedal Position (APP) sensors. The APP sensors are mounted to the accelerator pedal assembly and are not serviceable. The APP sensors provide a signal voltage that changes relative to the pedal position. The Engine Control Module (ECM) supplies each APP sensor with a 5 V reference circuit, a low reference circuit, and a signal circuit.
Both the APP sensors 1 and 2 signal percentages increase as the pedal is depressed, from approximately 0 percent at rest to above 95 percent when fully depressed.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the APP sensor 2 voltage is greater than 2.6 V for less than 1 s.

OBDII Code P2128 2016 GMC Sierra - Accelerator Pedal Position Sensor 2 Circuit High Voltage - AutoCodes.com — P2128 2016 GMC Sierra Code - Accelerator Pedal Position Sensor 2 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2128 2016 GMC Sierra?

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

How to Fix the DTC P2128 2016 GMC Sierra?

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 does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2128 2016 GMC Sierra 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 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P2128 in a 2016 GMC Sierra?

- Common symptoms include reduced engine power, difficulty accelerating, and the vehicle going into limp mode.

2. What does the OBDII code P2128 indicate in a 2016 GMC Sierra?

- The code P2128 indicates a high voltage condition in the circuit for the Accelerator Pedal Position Sensor 2.

3. What are the possible causes of OBDII code P2128 in a 2016 GMC Sierra?

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

4. How can I diagnose the cause of OBDII code P2128 in my 2016 GMC Sierra?

- Diagnosis typically involves checking the sensor's wiring and connectors for damage, testing the sensor's voltage, and scanning the engine control module for related error codes.

5. Can I continue driving my 2016 GMC Sierra with OBDII code P2128?

- It is not recommended to drive the vehicle with code P2128 as it may lead to further damage and safety issues. It is best to address the problem promptly.

6. How do I repair OBDII code P2128 in a 2016 GMC Sierra?

- Repairing the code may involve replacing the Accelerator Pedal Position Sensor 2, repairing any damaged wiring or connectors, or reprogramming the engine control module.

7. Are there any DIY tips for resolving OBDII code P2128 in my 2016 GMC Sierra?

- DIY tips include checking for loose connections, inspecting the sensor for physical damage, and ensuring proper voltage supply to the sensor.

8. How much does it cost to fix OBDII code P2128 in a 2016 GMC Sierra?

- The cost of fixing code P2128 can vary depending on the exact cause, but it may range from $200 to $500 for parts and labor.

9. Can a mechanic clear the OBDII code P2128 without fixing the issue in a 2016 GMC Sierra?

- Clearing the code without addressing the underlying issue is not recommended, as the problem may persist and potentially lead to more severe issues.

10. Is OBDII code P2128 a common problem in 2016 GMC Sierra vehicles?

- While it may not be extremely common, issues with the Accelerator Pedal Position Sensor 2 circuit can occur in 2016 GMC Sierra vehicles, leading to code P2128.