P2138 2017 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 2017 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 2017 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 2017 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 2017 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 2017 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 2017 GMC Sierra Code
What does OBDII code P2138 mean for a 2017 GMC Sierra?
P2138 indicates a correlation issue between Accelerator Pedal Position Sensor 1 and Sensor 2, signaling inconsistent voltage readings.
What are the common symptoms of code P2138 in a 2017 GMC Sierra?
Symptoms may include reduced engine power, the Check Engine Light, unresponsive acceleration, or erratic throttle behavior.
What causes the P2138 code in a 2017 GMC Sierra?
Common causes include a faulty accelerator pedal position sensor, damaged wiring or connectors, or issues with the throttle body.
Can I drive my 2017 GMC Sierra with code P2138?
Driving may be possible, but performance will likely be reduced, and it’s recommended to address the issue promptly to avoid further damage.
How do I diagnose the cause of P2138 on a 2017 GMC Sierra?
Diagnose by inspecting the accelerator pedal position sensor, checking wiring and connectors for damage or corrosion, and testing voltage outputs with a multimeter.
How is code P2138 typically repaired on a 2017 GMC Sierra?
Repairs often involve replacing the accelerator pedal position sensor, fixing damaged wiring, or cleaning throttle body components.
Does P2138 always require replacement of the accelerator pedal position sensor?
No, sometimes the issue is caused by wiring damage or poor electrical connections, which can be repaired without replacing the sensor.
What tools are needed to fix code P2138 on a 2017 GMC Sierra?
You may need a diagnostic scanner, multimeter, and basic hand tools to diagnose and repair the issue effectively.
How much does it cost to fix code P2138 on a 2017 GMC Sierra?
Repair costs vary but typically range from $150 to $400, depending on whether the accelerator pedal position sensor or wiring needs replacement.
Could a dirty throttle body cause code P2138 on a 2017 GMC Sierra?
While less common, a dirty throttle body could contribute to inconsistent sensor readings and should be inspected during diagnosis.
Discuss the causes and fixes for P2138 2017 GMC Sierra OBDII Code
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