The computer sees an electrical fault in the converter lock-up circuit. The driver may notice higher consumption and higher rpm on the highway.
Likely causes, most common first
- Faulty lock-up solenoid
- Damaged wiring or connector
- Low transmission fluid
- Internal connector leak in the transmission
Parts usually involved
- Lock-up solenoid
- Transmission connector
- Transmission fluid
Test before you replace
Check fluid level, then measure the solenoid circuit at the transmission connector.
General guidance for generic OBD2 codes. Always follow the maker's procedure for the car in front of you.