P0979 GMC Code - Shift Solenoid Valve 3 Control Circuit Low Voltage
Quick Answer
The P0979 diagnostic trouble code for a GMC vehicle indicates a problem with the Shift Solenoid Valve 3 Control Circuit, specifically a low voltage issue. Common causes include Faulty shift solenoid valve, 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 GMC indicates Shift Solenoid Valve 3 Control Circuit Low Voltage.
- Common causes
- Common causes include Faulty shift solenoid valve, 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 GMC Description
The P0979 diagnostic trouble code for a GMC vehicle indicates a problem with the Shift Solenoid Valve 3 Control Circuit, specifically a low voltage issue. The shift solenoid valve is responsible for directing transmission fluid to the appropriate clutch to engage the correct gear. When the control circuit voltage is low, it can lead to improper shifting, erratic transmission behavior, and potential damage to the transmission system.
Common Causes of P0979 GMC
- Faulty shift solenoid valve
- Damaged wiring or connectors in the control circuit
- Low transmission fluid levels
- Defective transmission control module
- Power supply issues to the solenoid valve
Symptoms of P0979 GMC
- Harsh or delayed shifting
- Erratic transmission behavior
- Transmission slipping
- Check Engine Light illuminated
- Reduced fuel efficiency
How to Fix P0979 GMC
- Begin by conducting a thorough diagnosis using a scan tool to retrieve the specific trouble code and identify the root cause of the low voltage issue.
- Inspect the wiring and connectors in the shift solenoid valve 3 control circuit for any damage or corrosion. Repair or replace as necessary.
- Check the transmission fluid level and condition. Top off or replace the fluid if it is low or contaminated.
- Test the shift solenoid valve 3 for proper operation. Replace the valve if it is found to be faulty.
- Clear the trouble code from the vehicle's computer system and test drive the vehicle to ensure proper shifting behavior.
Cost to Fix P0979 GMC
The typical repair costs for addressing a P0979 code in a GMC vehicle can range from $200 to $500, including parts and labor. However, it's important to note that the actual cost can vary based on the specific diagnosis time and labor rates at auto repair shops. Rates can differ depending on factors such as location, vehicle make and model, and engine type. It's recommended to consult with local auto repair shops for a more accurate estimate.
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Information for Specific GMC Models
- P0979 2014 GMC Sierra — Shift Solenoid Valve 3 Control Circuit Low Voltage
- P0979 2015 GMC Sierra — Shift Solenoid Valve 3 Control Circuit Low Voltage
- P0979 2016 GMC Sierra — Shift Solenoid Valve 3 Control Circuit Low Voltage
- P0979 2017 GMC Sierra — Shift Solenoid Valve 3 Control Circuit Low Voltage
- P0979 2018 GMC Sierra — Shift Solenoid Valve 3 Control Circuit Low Voltage
Frequently Asked Questions about P0979 GMC Code
1. What are the common symptoms of OBDII code P0979 in a GMC vehicle?
- Common symptoms include harsh shifting, transmission slipping, decreased fuel efficiency, and the transmission going into limp mode.
2. What could cause the Shift Solenoid Valve 3 Control Circuit Low Voltage error code in a GMC vehicle?
- Possible causes include a faulty shift solenoid valve, damaged wiring or connectors in the transmission control circuit, low transmission fluid levels, or a malfunctioning transmission control module.
3. How can I diagnose the Shift Solenoid Valve 3 Control Circuit Low Voltage issue in my GMC vehicle?
- Diagnosis typically involves using an OBDII scanner to retrieve the specific trouble code, inspecting the wiring and connectors for damage, checking the transmission fluid level and condition, and testing the shift solenoid valve for proper operation.
4. Is it safe to continue driving with OBDII code P0979 present in my GMC vehicle?
- It is not recommended to continue driving with this code present, as it can lead to further damage to the transmission and potentially leave you stranded on the road.
5. Can I repair the Shift Solenoid Valve 3 Control Circuit Low Voltage issue in my GMC vehicle myself?
- While some DIY enthusiasts may be able to address this issue by replacing the shift solenoid valve or repairing wiring themselves, it is recommended to seek professional help for accurate diagnosis and proper repair.
6. How much does it typically cost to fix the P0979 code in a GMC vehicle?
- The cost of fixing this issue can vary depending on the exact cause of the problem, but it may range from $200 to $500 or more, including parts and labor.
7. Are there any preventive maintenance steps I can take to avoid encountering the Shift Solenoid Valve 3 Control Circuit Low Voltage code?
- Regularly checking and maintaining proper transmission fluid levels, addressing any leaks promptly, and ensuring the transmission is serviced according to the manufacturer's recommendations can help prevent such issues.
8. Can a faulty transmission control module (TCM) trigger the P0979 code in a GMC vehicle?
- Yes, a malfunctioning TCM can potentially cause the shift solenoid valve control circuit low voltage error code to appear, as it plays a crucial role in regulating the transmission functions.
9. Will resetting the OBDII code P0979 in my GMC vehicle make the problem go away permanently?
- Resetting the code may temporarily clear the warning light, but if the underlying issue causing the code is not addressed, the problem is likely to reoccur.
10. Is it necessary to visit a dealership for repairs related to the Shift Solenoid Valve 3 Control Circuit Low Voltage code in a GMC vehicle?
- While a dealership may have specialized knowledge and tools for GMC vehicles, independent automotive repair shops with experience in transmission repairs can also effectively diagnose and fix this issue.
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