Error code
OBD2 P0979
OBD2P0979
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Shift Solenoid 'C' Control Circuit Low.
Severity
moderateCan drive but may experience shifting issues.
Summary
P0979 indicates a low control circuit issue with Shift Solenoid C in the transmission.
Symptoms
- Poor acceleration
- High-revving before shifting
- Harsh shifting
- Slow engagement
Common Causes
- Rodent damage to wiring harness
- Poorly routed or damaged wiring harness after repairs
- Faulty shift solenoid C
Diagnosis
- Check wiring harness for damage or poor connections.
- Perform resistance checks between TCM and shift solenoid C.
- Test the shift solenoid itself if necessary.
Fixes
- Repair damaged wiring harness or replace faulty shift solenoid C
FAQ
What causes P0979?
Common causes include rodent damage, poor repairs leading to damaged wiring, and a faulty shift solenoid.
How do I diagnose P0979?
Use a DVOM to check resistance in the control circuit between TCM and shift solenoid C. Inspect for physical damage or poor connections in the wiring harness.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
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