P0979 2016 GMC Sierra Code - Shift Solenoid Valve 3 Control Circuit Low Voltage
Quick Answer
The P0979 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the Shift Solenoid Valve 3 Control Circuit, specifically a low voltage condition. Common causes include Faulty wiring or connections, Malfunctioning shift solenoid valve, Damaged 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
- P0979 2016 GMC Sierra indicates Shift Solenoid Valve 3 Control Circuit Low Voltage.
- Common causes
- Common causes include Faulty wiring or connections, Malfunctioning shift solenoid valve, Damaged 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 P0979 2016 GMC Sierra Description
The P0979 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the Shift Solenoid Valve 3 Control Circuit, specifically a low voltage condition. The shift solenoid valve is a crucial component of the transmission system that controls the flow of transmission fluid to engage or disengage specific gears. In this case, a low voltage reading suggests that the electrical signal to the solenoid is weaker than expected, potentially leading to improper shifting or failure to shift gears altogether.
Common Causes of P0979 2016 GMC Sierra
- Faulty wiring or connections
- Malfunctioning shift solenoid valve
- Damaged transmission control module (TCM)
- Issues with the power supply to the solenoid
Symptoms of P0979 2016 GMC Sierra
- Harsh or delayed shifting
- Slipping gears
- Stuck in a particular gear
- Reduced fuel efficiency
- Poor acceleration
How to Fix P0979 2016 GMC Sierra
- Begin by conducting a thorough inspection of the wiring and connections related to the Shift Solenoid Valve 3 Control Circuit.
- Test the shift solenoid valve for proper operation and replace if necessary.
- Check the transmission control module (TCM) for any damage or malfunctions and replace if needed.
- Verify the power supply to the solenoid and address any issues with the electrical system.
- Clear the DTC and test drive the vehicle to ensure proper shifting and transmission operation.
Cost to Fix P0979 2016 GMC Sierra
The typical repair costs for addressing a P0979 code on a 2016 GMC Sierra can vary depending on the specific cause of the issue. Parts such as a new shift solenoid valve or transmission control module can range from $100 to $500, while labor costs can add an additional $200 to $500. Overall, the total repair cost for this issue could range from $300 to $1000. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.
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Frequently Asked Questions about P0979 2016 GMC Sierra Code
1. What does OBDII code P0979 mean on a 2016 GMC Sierra?
P0979 refers to a "Shift Solenoid Valve 3 Control Circuit Low Voltage," indicating an electrical issue with the shift solenoid responsible for gear shifting.
2. What are the symptoms of code P0979 in a 2016 GMC Sierra?
Symptoms may include hard or delayed shifting, transmission stuck in one gear, reduced fuel efficiency, and the illumination of the check engine light.
3. What causes the P0979 code on a 2016 GMC Sierra?
Common causes include a faulty shift solenoid, damaged wiring or connectors in the control circuit, low transmission fluid, or issues with the transmission control module (TCM).
4. Can low transmission fluid cause the P0979 code?
Yes, low or contaminated transmission fluid can affect solenoid operation and trigger the P0979 code.
5. How do you diagnose code P0979 on a 2016 GMC Sierra?
Diagnosis involves checking the transmission fluid level, inspecting wiring and connectors for damage, testing the shift solenoid, and using a scan tool to monitor transmission control module signals.
6. Can I drive my 2016 GMC Sierra with the P0979 code?
Driving with this code is not recommended as it can lead to further transmission damage or unsafe driving conditions due to improper gear shifting.
7. How do you fix the P0979 code on a 2016 GMC Sierra?
Repairs may include replacing the faulty shift solenoid, repairing or replacing damaged wiring, cleaning connectors, or updating/replacing the transmission control module.
8. How much does it cost to fix the P0979 code on a 2016 GMC Sierra?
Repair costs vary, typically ranging from $200 to $500 for solenoid replacement or wiring repairs, excluding diagnostic fees.
9. Can a bad transmission control module cause the P0979 code?
Yes, a malfunctioning transmission control module can lead to electrical issues that trigger the P0979 code.
10. Is the P0979 code a common issue for the 2016 GMC Sierra?
While not extremely common, it can occur due to wear and tear on the transmission components or electrical issues. Regular maintenance helps prevent such problems.
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