OBD-II code · Powertrain (generic)
P0979 Shift Solenoid C Control Circuit Low
TCM detects voltage on shift solenoid C control circuit below threshold. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P0979?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyShort to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1.5–6 h
- Emissions test
- Usually unaffected
- Parts involved
- Shift Solenoid C, Wiring Harness
Related codes
- P08D2Shift Solenoid J Control Circuit Low
- P08DBShift Solenoid K Control Circuit Low
- P08E4Shift Solenoid L Control Circuit Low
- P0973Shift Solenoid A Control Circuit Low
- P0976Shift Solenoid B Control Circuit Low
- P0982Shift Solenoid D Control Circuit Low
- P0985Shift Solenoid E Control Circuit Low
- P0998Shift Solenoid F Control Circuit Low
- P099BShift Solenoid G Control Circuit Low
- P099EShift Solenoid H Control Circuit Low
- P0977Shift Solenoid B Control Circuit High
- P0978Shift Solenoid C Control Circuit Range/Performance
- P097AShift Solenoid A Control Circuit/Open
- P097BShift Solenoid B Control Circuit/Open
- P097CShift Solenoid C Control Circuit/Open
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.