P0979 2018 GMC Sierra Code - Shift Solenoid Valve 3 Control Circuit Low Voltage
Quick Answer
The P0979 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the Shift Solenoid Valve 3 Control Circuit, specifically reporting low voltage. Common causes include Faulty shift solenoid valve 3, Damaged wiring or connectors in the control circuit, Low transmission fluid levels. 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
- P0979 2018 GMC Sierra indicates Shift Solenoid Valve 3 Control Circuit Low Voltage.
- Common causes
- Common causes include Faulty shift solenoid valve 3, Damaged wiring or connectors in the control circuit, Low transmission fluid levels.
- 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 P0979 2018 GMC Sierra Description
The P0979 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the Shift Solenoid Valve 3 Control Circuit, specifically reporting low voltage. This code is typically triggered when the powertrain control module (PCM) detects that the voltage signal from the shift solenoid valve 3 control circuit is below the expected range. The shift solenoid valve 3 is responsible for controlling the hydraulic pressure that engages the third gear in the transmission.
Common Causes of P0979 2018 GMC Sierra
- Faulty shift solenoid valve 3
- Damaged wiring or connectors in the control circuit
- Low transmission fluid levels
- Malfunctioning PCM
Symptoms of P0979 2018 GMC Sierra
- Difficulty shifting gears, especially into third gear
- Harsh or delayed shifting
- Erratic behavior while driving
- Transmission slippage
How to Fix P0979 2018 GMC Sierra
- Begin by conducting a thorough inspection of the shift solenoid valve 3, wiring, and connectors for any visible damage or corrosion.
- Test the shift solenoid valve 3 using a multimeter to check for proper resistance and continuity.
- Check the transmission fluid level and condition, topping off or replacing as needed.
- Clear the DTC from the PCM memory using a diagnostic scan tool and test drive the vehicle to ensure the issue has been resolved.
- If the problem persists, consider seeking professional help to diagnose and repair any underlying electrical or mechanical issues.
Cost to Fix P0979 2018 GMC Sierra
The cost of repairing a P0979 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. On average, the parts for a shift solenoid valve replacement can range from $100 to $300, while labor costs can add another $100 to $200. Overall, the total repair cost may fall between $200 and $500. It's important to note that these estimates are general and can fluctuate based on factors such as location, labor rates, and additional repairs needed. It's recommended to consult with a trusted mechanic or dealership for a more accurate cost estimate.
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