P0979 2014 GMC Sierra Code - Shift Solenoid Valve 3 Control Circuit Low Voltage
Quick Answer
The Transmission Control Module (TCM) high side driver 1 supplies 12 V to pressure control solenoid valve 3. Common causes include Faulty Shift Solenoid Valve 3, Shift Solenoid Valve 3 harness is open or shorted, Shift Solenoid Valve 3 circuit poor electrical connection. 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 2014 GMC Sierra indicates Shift Solenoid Valve 3 Control Circuit Low Voltage.
- Common causes
- Common causes include Faulty Shift Solenoid Valve 3, Shift Solenoid Valve 3 harness is open or shorted, Shift Solenoid Valve 3 circuit poor electrical connection.
- 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.
Code P0979 2014 GMC Sierra Description
What are the Possible Causes of the DTC P0979 2014 GMC Sierra?
- Faulty Shift Solenoid Valve 3
- Shift Solenoid Valve 3 harness is open or shorted
- Shift Solenoid Valve 3 circuit poor electrical connection
- Faulty Transmission Control Module (TCM)
How to Fix the DTC P0979 2014 GMC Sierra?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0979 2014 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0979 2014 GMC Sierra Code
1. What does OBDII code P0979 mean on a 2014 GMC Sierra?
Code P0979 indicates a low voltage issue in the control circuit for Shift Solenoid Valve 3, which is part of the transmission control system.
2. What are the common symptoms of code P0979 in a 2014 GMC Sierra?
Symptoms may include harsh or delayed shifting, being stuck in a specific gear, transmission slippage, or the Check Engine Light turning on.
3. What causes the P0979 code to appear?
Common causes include a faulty shift solenoid, damaged or corroded wiring, a bad transmission control module (TCM), or low transmission fluid.
4. Can low transmission fluid cause code P0979?
Yes, low or contaminated transmission fluid can affect solenoid operation and trigger the P0979 code.
5. How do you diagnose a P0979 code on a 2014 GMC Sierra?
A technician will check the transmission fluid level, inspect wiring and connectors for damage or corrosion, test the shift solenoid, and check for proper voltage in the circuit.
6. Can you drive with a P0979 code active?
Driving is possible but not recommended, as it can cause further damage to the transmission and lead to unsafe driving conditions.
7. How is the P0979 code repaired on a 2014 GMC Sierra?
Repairs may include replacing the shift solenoid, repairing or replacing damaged wiring or connectors, or updating/replacing the TCM if necessary.
8. How much does it cost to fix a P0979 code on a GMC Sierra?
The cost varies, but replacing a shift solenoid typically ranges from $150 to $400, depending on labor and part costs.
9. Can a P0979 code clear itself?
The code may clear temporarily after fixing the issue, but it usually requires resetting with an OBDII scanner after repairs are completed.
10. How can I prevent code P0979 from occurring again?
Regularly check and maintain proper transmission fluid levels, inspect wiring and connectors for damage, and address transmission issues promptly.
Discuss the causes and fixes for P0979 2014 GMC Sierra OBDII Code
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