P0766

What does P0766 mean?

P-code P0766 means "Shift Solenoid C Stuck On". It is a generic OBD-II diagnostic trouble code (DTC) in the transmission. The shift solenoid c stuck on is mechanically or electronically stuck and cannot move to the commanded position. This code can be monitored, but service is recommended to prevent escalation. This code applies to OBD-II compliant electric and hybrid vehicles.

Possible Causes

• Mechanical obstruction preventing movement to the commanded position
• Actuator motor failure or binding due to wear
• Ice or debris accumulation blocking mechanical travel
• Faulty position feedback sensor incorrectly reporting stuck position

Recommended Actions

1. 1 Note the alert and schedule a diagnostic appointment when convenient
2. 2 Scan for all DTCs with an OBD-II scanner — note any related codes stored alongside P0766
3. 3 Inspect the mechanical component for physical obstruction, ice, or debris
4. 4 Manually operate (if safe) to check for binding or unusual resistance
5. 5 Clear the DTC, road-test the vehicle, and re-scan to confirm whether the fault returns
6. 6 If the fault persists after inspection and clearing, consult an EV-certified technician for component replacement

Related Transmission fault codes