Engine-Codes - GMC - P0979 GMC

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

- Code Popularity: 3,083 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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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)
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How to Fix the DTC P0979 GMC?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P0979 GMC code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops 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

What Does the P0979 GMC Code Mean?

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.

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

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