AutoCodes.com | All About OBDII Engine Codes
AutoCodes - GMC - P0979 GMC

P0979 GMC Code - Shift Solenoid Valve 3 Control Circuit Low Voltage

- Code Popularity: 3,082 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
Share on Facebook   Share on Twitter   Share on Linkedin

What are the Possible Causes of the DTC P0979 GMC?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • 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)
⚠ Does your GMC have Safety Recalls? → Check here

How to Fix the DTC P0979 GMC?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Search for P0979 GMC Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0979 GMC code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Lack/Loss of power
  • Transmission shifting problems

Code P0979 GMC Description

The Transmission Control Module (TCM) high side driver 1 supplies 12 V to pressure control solenoid valve 3. The TCM also provides a control circuit and uses a low-side driver to control shift solenoid valve 3. The Diagnostic Trouble Code (DTC) will be set when the Transmission Control Module detects an open or a short to ground on the shift solenoid valve 3 control circuit for greater than 1 s.

OBDII Code P0979 GMC - Shift Solenoid Valve 3 Control Circuit Low Voltage - AutoCodes.com
P0979 GMC Code - Shift Solenoid Valve 3 Control Circuit Low Voltage

Need More Information on the Code?

Need more information on how to fix the P0979 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0979 GMC code diagnosed by a professional: Find a repair shop in your area

Code P0979 GMC comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the P0979 GMC code? Have you replaced any parts?
Any information is appreciated. Thanks