P0974 2016 GMC Sierra Code - Shift Solenoid Valve 1 Control Circuit High Voltage
Quick Answer
The P0974 diagnostic trouble code (DTC) in a 2016 GMC Sierra indicates a problem with the Shift Solenoid Valve 1 Control Circuit, specifically detecting high voltage levels. Common causes include Faulty shift solenoid valve, Damaged wiring or connectors in the control circuit, Malfunctioning transmission control module (TCM). 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
- P0974 2016 GMC Sierra indicates Shift Solenoid Valve 1 Control Circuit High Voltage.
- Common causes
- Common causes include Faulty shift solenoid valve, Damaged wiring or connectors in the control circuit, Malfunctioning transmission control module (TCM).
- 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 P0974 2016 GMC Sierra Description
The P0974 diagnostic trouble code (DTC) in a 2016 GMC Sierra indicates a problem with the Shift Solenoid Valve 1 Control Circuit, specifically detecting high voltage levels. The shift solenoid valve is a crucial component of the transmission system responsible for controlling the flow of transmission fluid to facilitate gear changes. When the control circuit for Shift Solenoid Valve 1 detects high voltage, it means that there is an electrical issue affecting the operation of this solenoid.
Common Causes of P0974 2016 GMC Sierra
- Faulty shift solenoid valve
- Damaged wiring or connectors in the control circuit
- Malfunctioning transmission control module (TCM)
- Power supply issues to the solenoid
- Corrosion or contamination in the solenoid valve
Symptoms of P0974 2016 GMC Sierra
- Erratic shifting behavior
- Harsh gear changes
- Delayed or no gear engagement
- Transmission slippage
- Poor acceleration and reduced fuel efficiency
How to Fix P0974 2016 GMC Sierra
- Diagnose the specific cause of the high voltage condition using a scan tool to retrieve the DTC and perform electrical testing on the shift solenoid valve and control circuit.
- Inspect the wiring harness and connectors for any damage, corrosion, or loose connections. Repair or replace as necessary.
- Test the shift solenoid valve for proper functionality and replace if found to be faulty.
- Check the transmission control module (TCM) for any fault codes or malfunctions and address accordingly.
- Clear the DTC from the vehicle's memory and test drive to confirm that the issue has been resolved.
Cost to Fix P0974 2016 GMC Sierra
The typical repair costs for addressing the Shift Solenoid Valve 1 Control Circuit High Voltage issue in a 2016 GMC Sierra can range from $200 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate. Auto repair shops commonly charge between $80 and $150 per hour, with rates potentially higher in metropolitan areas or at dealerships, while independent shops often charge less.
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