P2123 2017 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 2017 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 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 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 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 P2123 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 P2123 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 P2123 2017 GMC Sierra Code
1. What are the common symptoms of OBDII code P2123 on a 2017 GMC Sierra?
When the accelerator pedal position sensor 1 circuit shows high voltage (P2123), common symptoms may include reduced engine power, sudden acceleration surges, and the vehicle going into "limp mode."
2. What causes the OBDII code P2123 on a 2017 GMC Sierra?
The Accelerator Pedal Position Sensor 1 Circuit High Voltage code (P2123) on a 2017 GMC Sierra is often caused by a faulty accelerator pedal position sensor, damaged wiring or connectors, or issues with the engine control module.
3. How can I diagnose the OBDII code P2123 on my 2017 GMC Sierra?
To diagnose the P2123 code, you can use an OBDII scanner to retrieve the trouble code and then inspect the accelerator pedal position sensor and its wiring for any visible damage. Testing the sensor's voltage output can also help pinpoint the issue.
4. Is it safe to drive my 2017 GMC Sierra with the P2123 code?
It is not recommended to drive your GMC Sierra with the P2123 code present, as it can lead to sudden loss of power or unexpected acceleration, posing a safety risk. It's best to address the issue promptly.
5. Can I repair the OBDII code P2123 on my 2017 GMC Sierra myself?
While it is possible to repair the P2123 code yourself if you have the necessary tools and knowledge, it is recommended to consult a professional mechanic to accurately diagnose and fix the issue with the accelerator pedal position sensor.
6. What are the repair options for fixing the P2123 code on a 2017 GMC Sierra?
Repair options for the P2123 code include replacing the accelerator pedal position sensor, repairing damaged wiring or connectors, or reprogramming the engine control module if necessary.
7. How much does it cost to fix the OBDII code P2123 on a 2017 GMC Sierra?
The cost of fixing the P2123 code on a 2017 GMC Sierra can vary depending on the root cause of the issue, the cost of parts, and labor charges. It's advisable to obtain quotes from different mechanics or repair shops.
8. Will resetting the OBDII code P2123 on my 2017 GMC Sierra make it go away permanently?
Resetting the OBDII code P2123 may temporarily clear the code, but if the underlying issue with the accelerator pedal position sensor is not fixed, the code is likely to reappear. It's essential to address the root cause of the problem.
9. Can extreme weather conditions trigger the OBDII code P2123 on a 2017 GMC Sierra?
Extreme weather conditions can potentially affect the performance of sensors and electrical components in your GMC Sierra, leading to issues like the P2123 code. Ensuring proper insulation and protection for these components is important.
10. Is the Accelerator Pedal Position Sensor 1 Circuit High Voltage code (P2123) a common issue in the 2017 GMC Sierra?
While the P2123 code may not be as common as other OBDII codes, issues with the accelerator pedal position sensor can still occur in the 2017 GMC Sierra, requiring proper diagnosis and repair to ensure optimal vehicle performance.
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