P0979 2015 GMC Sierra Code - Shift Solenoid Valve 3 Control Circuit Low Voltage
Quick Answer
The P0979 code on a 2015 GMC Sierra indicates a problem with the Shift Solenoid Valve 3 Control Circuit, specifically detecting low voltage. Common causes include Damaged wiring in the shift solenoid valve circuit, Faulty shift solenoid valve, Malfunctioning transmission control module. 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 2015 GMC Sierra indicates Shift Solenoid Valve 3 Control Circuit Low Voltage.
- Common causes
- Common causes include Damaged wiring in the shift solenoid valve circuit, Faulty shift solenoid valve, Malfunctioning transmission control module.
- 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 2015 GMC Sierra Description
The P0979 code on a 2015 GMC Sierra indicates a problem with the Shift Solenoid Valve 3 Control Circuit, specifically detecting low voltage. The shift solenoid valve is a crucial component in the transmission system that helps regulate the flow of transmission fluid to control gear shifting. When the control circuit for solenoid valve 3 is experiencing low voltage, it can lead to issues with shifting gears smoothly and efficiently.
Common Causes of P0979 2015 GMC Sierra
- Damaged wiring in the shift solenoid valve circuit
- Faulty shift solenoid valve
- Malfunctioning transmission control module
- Poor electrical connection
- Low transmission fluid level
Symptoms of P0979 2015 GMC Sierra
- Harsh or delayed shifting
- Erratic transmission behavior
- Transmission slippage
- Illuminated Check Engine Light
- Reduced fuel efficiency
How to Fix P0979 2015 GMC Sierra
- Begin by conducting a thorough inspection of the shift solenoid valve circuit, checking for any damaged or loose wiring.
- Test the shift solenoid valve for proper operation and replace it if necessary.
- Inspect the transmission control module for any faults and address any issues found.
- Verify the electrical connections related to the shift solenoid valve for proper contact and repair any poor connections.
- Clear the diagnostic trouble codes, reset the system, and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0979 2015 GMC Sierra
The typical repair costs for addressing a P0979 code on a 2015 GMC Sierra can vary depending on the specific cause of the issue. On average, the parts for this repair, including a new shift solenoid valve, can range from $100 to $300. Labor costs typically range from $150 to $300, with the total repair cost falling between $250 and $600. It's important to note that these estimates are general and can vary based on factors such as location, shop rates, and the extent of the repair needed. It's recommended to obtain quotes from local auto repair shops for a more accurate cost estimate.
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Frequently Asked Questions about P0979 2015 GMC Sierra Code
1. What does the OBDII code P0979 mean on a 2015 GMC Sierra?
P0979 indicates a low voltage issue in the control circuit for Shift Solenoid Valve 3, which helps manage gear shifting in the transmission.
2. What are the common symptoms of code P0979 in a 2015 GMC Sierra?
Symptoms may include harsh or erratic shifting, stuck gears, limp mode activation, or an illuminated check engine light.
3. What causes the P0979 code on a GMC Sierra?
The most common causes are a faulty shift solenoid, damaged wiring or connectors in the circuit, low transmission fluid, or a malfunctioning transmission control module (TCM).
4. Can low transmission fluid trigger the P0979 code?
Yes, insufficient or contaminated transmission fluid can affect solenoid performance and lead to this code.
5. How do I diagnose the P0979 code on my 2015 GMC Sierra?
Start by inspecting the transmission wiring and connectors for damage, checking the solenoid's resistance, and testing the voltage at the solenoid circuit.
6. How do I fix the P0979 code on my GMC Sierra?
Repairs may include replacing the faulty shift solenoid, repairing damaged wiring, cleaning or reconnecting corroded connectors, or addressing low transmission fluid.
7. Is it safe to drive with the P0979 code on a 2015 GMC Sierra?
Driving with this code can lead to erratic shifting and potential transmission damage, so it’s best to address the issue promptly.
8. How much does it cost to repair the P0979 code on a GMC Sierra?
Costs can vary, but replacing a shift solenoid typically ranges from $200 to $400, while wiring repairs can cost less depending on the extent of the damage.
9. Can a bad TCM cause the P0979 code in a 2015 GMC Sierra?
Yes, a malfunctioning Transmission Control Module can cause improper voltage regulation in the solenoid circuit, triggering this code.
10. Will clearing the P0979 code fix the problem permanently?
No, clearing the code will only reset the warning temporarily. The underlying issue must be diagnosed and repaired to prevent the code from returning.
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