P2122 GMC Code - Accelerator Pedal Position Sensor 1 Circuit Low 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
- P2122 GMC indicates Accelerator Pedal Position Sensor 1 Circuit Low 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 P2122 GMC 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 1 voltage is less than 0.46 V for less than 1 s.
What are the Possible Causes of the DTC P2122 GMC?
- 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 P2122 GMC?
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 P2122 GMC 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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Information for Specific GMC Models
- P2122 2014 GMC Sierra — Accelerator Pedal Position Sensor 1 Circuit Low Voltage
- P2122 2015 GMC Sierra — Accelerator Pedal Position Sensor 1 Circuit Low Voltage
- P2122 2016 GMC Sierra — Accelerator Pedal Position Sensor 1 Circuit Low Voltage
- P2122 2017 GMC Sierra — Accelerator Pedal Position Sensor 1 Circuit Low Voltage
- P2122 2018 GMC Sierra — Accelerator Pedal Position Sensor 1 Circuit Low Voltage
Frequently Asked Questions about P2122 GMC Code
What does the OBDII code P2122 mean for a GMC vehicle?
Code P2122 indicates that the voltage from Accelerator Pedal Position Sensor 1 is lower than expected, signaling a potential issue with the sensor or wiring.
What are the common symptoms of P2122 in a GMC?
Symptoms include reduced engine power, difficulty accelerating, the check engine light turning on, and potentially entering "limp mode."
What causes the P2122 code to appear on a GMC vehicle?
Common causes include a faulty accelerator pedal position sensor, damaged wiring or connectors, or issues with the throttle control system.
Can driving with the P2122 code damage my GMC?
Driving with P2122 might limit performance and could pose safety risks, but it typically won't cause immediate engine damage. Prompt repair is recommended.
How do you diagnose P2122 on a GMC vehicle?
Diagnosis involves scanning for codes, inspecting the accelerator pedal sensor and its wiring, checking voltage readings, and testing the throttle body system.
How can you fix the P2122 code on a GMC?
Repairs typically include replacing the accelerator pedal position sensor, repairing damaged wiring or connectors, or recalibrating the throttle system.
Does P2122 require a sensor replacement?
Not always. Sometimes the issue is caused by a loose connector or damaged wiring rather than a faulty sensor.
How much does it cost to fix the P2122 code on a GMC?
Repair costs vary, but replacing the accelerator pedal position sensor typically costs between $100 and $300, including parts and labor.
Can a dirty throttle body cause the P2122 code?
While rare, a dirty throttle body can cause similar symptoms, but P2122 usually points directly to issues with the pedal position sensor or wiring.
Do I need to recalibrate the throttle system after fixing P2122?
Yes, recalibration is often necessary after replacing the accelerator pedal position sensor to ensure proper operation.
Discuss the causes and fixes for P2122 GMC OBDII Code
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