P2138 2015 GMC Sierra Code - Accelerator Pedal Position Sensor 1-2 Correlation
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
- P2138 2015 GMC Sierra indicates Accelerator Pedal Position Sensor 1-2 Correlation.
- 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 P2138 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 APP sensor 1 and APP sensor 2 disagree greater than 10 percent for less than 1 s or the ECM detects that both APP sensor 1 and APP sensor 2 are 5 percent greater than the learned minimum position for less than 1 s.
What are the Possible Causes of the DTC P2138 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 P2138 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 P2138 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 P2138 2015 GMC Sierra Code
What does OBDII code P2138 mean for a 2015 GMC Sierra?
Code P2138 indicates a problem with the correlation between Accelerator Pedal Position Sensor 1 and Sensor 2, suggesting inconsistent signals from the pedal sensors.
What are the symptoms of code P2138 on a 2015 GMC Sierra?
Common symptoms include reduced engine power, the check engine light turning on, and difficulty accelerating or hesitation during throttle input.
What causes code P2138 on a 2015 GMC Sierra?
Typical causes include a faulty accelerator pedal position sensor, damaged wiring or connectors, or electrical issues such as corrosion or shorts.
Can I drive my 2015 GMC Sierra with code P2138 active?
While it may be possible to drive, the vehicle may enter "limp mode," reducing power and performance. Driving with this code is not recommended, as it could worsen underlying issues.
How is code P2138 diagnosed on a 2015 GMC Sierra?
Technicians typically use a scan tool to monitor live data from the pedal position sensors, inspect wiring and connectors for damage, and test the sensors for proper function.
How do I fix code P2138 on a 2015 GMC Sierra?
Repairs may include replacing the accelerator pedal position sensor, repairing or replacing damaged wiring, or cleaning corroded connectors.
What does "correlation" mean in the context of code P2138?
"Correlation" refers to the expected relationship between signals from Sensor 1 and Sensor 2 in the accelerator pedal position sensor. When these signals don’t align, the code is triggered.
Can cleaning the accelerator pedal position sensor fix code P2138?
Cleaning the sensor may help if dirt or debris is affecting its performance, but often replacement is needed if the sensor itself is faulty.
Is code P2138 a common issue for the 2015 GMC Sierra?
Yes, this code can occur frequently in GM vehicles, including the Sierra, due to issues with the pedal position sensors or related wiring.
How much does it cost to fix code P2138 on a 2015 GMC Sierra?
Repair costs can range from $100 to $300, depending on whether the accelerator pedal assembly needs replacement or just wiring repairs.
Discuss the causes and fixes for P2138 2015 GMC Sierra OBDII Code
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