P2123 2015 GMC Sierra Code - Accelerator Pedal Position Sensor 1 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
- P2123 2015 GMC Sierra indicates Accelerator Pedal Position Sensor 1 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 P2123 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 1 voltage is greater than 4.75 V for less than 1 s.
What are the Possible Causes of the DTC P2123 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 P2123 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 P2123 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 P2123 2015 GMC Sierra Code
What does the OBDII code P2123 mean for a 2015 GMC Sierra?
P2123 indicates a high voltage issue in the Accelerator Pedal Position Sensor 1 circuit, which helps monitor the position of the accelerator pedal.
What are the common symptoms of P2123 in a 2015 GMC Sierra?
Symptoms may include reduced engine power, hesitation during acceleration, poor throttle response, or the vehicle entering "limp mode."
What causes the P2123 code to appear?
Common causes include a faulty accelerator pedal position sensor, wiring issues such as damaged or corroded connections, or a malfunctioning throttle body.
Can I drive my 2015 GMC Sierra with the P2123 code?
Driving with this code may result in limited engine power and potential safety risks. It’s best to address the issue promptly to avoid further damage.
How do I diagnose the P2123 code on a 2015 GMC Sierra?
Start by inspecting the wiring and connectors for damage or corrosion. Use a multimeter to test the sensor voltage and check for irregularities.
How do I fix the P2123 code on a 2015 GMC Sierra?
Repairs may include replacing the accelerator pedal position sensor, repairing or replacing damaged wiring, or cleaning the throttle body.
How much does it cost to fix the P2123 code on a 2015 GMC Sierra?
Repair costs vary but typically range from $100 to $300, depending on whether the sensor or wiring needs replacement.
Can a dirty throttle body cause the P2123 code?
Yes, a dirty or malfunctioning throttle body can contribute to this code by affecting proper communication between the sensors and the engine control module.
Do I need special tools to fix the P2123 code on a GMC Sierra?
Basic tools like a multimeter and OBDII scanner are sufficient for diagnosis. Replacement of parts may require standard hand tools.
Is the P2123 code covered under warranty for a 2015 GMC Sierra?
It depends on the vehicle’s warranty coverage. If the issue is related to a defective sensor or throttle body, it might be covered under certain warranties.
Discuss the causes and fixes for P2123 2015 GMC Sierra OBDII Code
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