P0978: Shift Solenoid C Control Circuit Range/Performance
What to do
Note which gears still work. If you are buying the part yourself, identify it from your transmission code rather than from the fault code — the solenoid letters mean different things on different gearboxes.
What this code means
The control circuit for shift solenoid C is responding outside its expected window. The caution from P0760 applies to any part ordered on the strength of this code: the solenoid letters are not standardised across manufacturers, so identifying the part from the code number alone is a reliable way to buy the wrong one. It has to come from data for that specific transmission.
Likely causes
Start here
- High resistance in solenoid wiring · moderate
- Failed shift solenoid · moderate
- Corroded transmission connector · moderate
Less common
- Control module driver failure · specialist
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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