What does code P0978 mean?

Q: What does code P0978 mean?

Shift Solenoid 'C' Control Circuit Range/Performance. P0978 indicates that the powertrain control module (PCM) has detected an abnormal electrical condition in the control circuit for shift solenoid 'C', which is responsible for managing hydraulic pressure to a specific gear clutch pack. The PCM monitors the solenoid's commanded state versus actual circuit feedback and sets this code when the voltage or current falls outside the expected range for the commanded state.

DTC codes / P09xx · Transmission / P0978

P0978Shift Solenoid 'C' Control Circuit Range/Performance

P0978 indicates that the powertrain control module (PCM) has detected an abnormal electrical condition in the control circuit for shift solenoid 'C', which is responsible for managing hydraulic pressure to a specific gear clutch pack. The PCM monitors the solenoid's commanded state versus actual circuit feedback and sets this code when the voltage or current falls outside the expected range for the commanded state.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaTransmission

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.