P2128 2015 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 2015 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.
Code P2128 2015 GMC Sierra Description
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.
What are the Possible Causes of the DTC P2128 2015 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 2015 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 is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P2128 2015 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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Frequently Asked Questions about P2128 2015 GMC Sierra Code
1. What does the OBDII code P2128 mean on a 2015 GMC Sierra?
P2128 indicates that the Engine Control Module (ECM) has detected a high voltage signal from the Accelerator Pedal Position Sensor 2 Circuit, which monitors throttle input.
2. What are common symptoms of code P2128 on a 2015 GMC Sierra?
Symptoms may include reduced engine performance, limited throttle response, the check engine light turning on, and the vehicle possibly entering limp mode.
3. What causes the P2128 code on a 2015 GMC Sierra?
Common causes include a faulty accelerator pedal position sensor, damaged wiring or connectors in the sensor circuit, or issues with the ECM itself.
4. Can I drive my 2015 GMC Sierra with a P2128 code?
Driving with this code is not recommended, as it may cause reduced throttle control and could lead to unsafe driving conditions.
5. How do I diagnose the P2128 code on a 2015 GMC Sierra?
Start by inspecting the accelerator pedal position sensor and its wiring for damage, check the sensor's voltage with a multimeter, and use a scan tool to monitor live data for irregularities.
6. How can I fix a P2128 code on a 2015 GMC Sierra?
Repairs may involve replacing the accelerator pedal position sensor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the ECM if necessary.
7. How much does it cost to repair code P2128 on a 2015 GMC Sierra?
Repair costs vary but typically range from $150 to $400, depending on whether the issue is with the sensor, wiring, or ECM.
8. Can a dirty throttle body cause a P2128 code on a 2015 GMC Sierra?
A dirty throttle body is unlikely to cause this code directly, but it may contribute to throttle-related issues. The primary cause is usually sensor or circuit-related.
9. Do I need to replace the accelerator pedal assembly for a P2128 code?
In some cases, replacing the entire accelerator pedal assembly is necessary if the position sensor is integrated and cannot be replaced separately.
10. Will clearing the P2128 code fix the problem on a 2015 GMC Sierra?
Clearing the code will temporarily turn off the check engine light, but the underlying issue must be resolved to prevent the code from returning.
Discuss the causes and fixes for P2128 2015 GMC Sierra OBDII Code
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