P0123 2017 GMC Sierra Code - Throttle Position Sensor Circuit High Voltage
Quick Answer
The P0123 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a potential issue with the throttle position sensor (TPS) circuit registering a higher voltage than expected. Common causes include Faulty throttle position sensor, Damaged or corroded TPS wiring or connectors, Issues with the ECM. 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
- P0123 2017 GMC Sierra indicates Throttle Position Sensor Circuit High Voltage.
- Common causes
- Common causes include Faulty throttle position sensor, Damaged or corroded TPS wiring or connectors, Issues with the ECM.
- 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.
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Code P0123 2017 GMC Sierra Description
The P0123 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a potential issue with the throttle position sensor (TPS) circuit registering a higher voltage than expected. The TPS is a crucial component of the vehicle's electronic throttle control system, responsible for monitoring the position of the throttle pedal and sending signals to the engine control module (ECM) to adjust the air-fuel mixture accordingly.
Common Causes of P0123 2017 GMC Sierra
- Faulty throttle position sensor
- Damaged or corroded TPS wiring or connectors
- Issues with the ECM
- Intermittent electrical connections
- Environmental factors such as moisture or debris affecting the TPS circuit
Symptoms of P0123 2017 GMC Sierra
- Poor acceleration or lack of throttle response
- Rough idling or fluctuating engine speed
- Stalling or hesitation during acceleration
- Illumination of the check engine light
- Reduced fuel efficiency
How to Fix P0123 2017 GMC Sierra
- Begin by diagnosing the TPS circuit using a scan tool to confirm the P0123 code.
- Inspect the TPS wiring and connectors for any damage or corrosion, repairing or replacing as needed.
- Test the TPS sensor itself for proper operation and replace if found to be faulty.
- Clear the DTC from the ECM's memory and perform a test drive to confirm the issue has been resolved.
- If the problem persists, further diagnostics may be required to identify any underlying ECM issues or intermittent electrical faults.
Cost to Fix P0123 2017 GMC Sierra
The typical repair costs for addressing a P0123 code on a 2017 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a faulty throttle position sensor can cost between $100 and $200, while addressing wiring or connector issues may add to the total cost. Labor rates at auto repair shops can range from $80 to $150 per hour, so the total repair cost could amount to several hundred dollars. It's advisable to consult with a professional technician for a more accurate estimate based on the specific circumstances of the vehicle.
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