P0685 HONDA - Engine Control Module Power Relay Control Circuit Open
- Faulty Engine Control Module (ECM) power relay
- ECM power relay harness is open or shorted
- ECM power relay circuit poor electrical connection
- Blown ECM fuse
- Faulty ECM
Check all the Engine Control Module (ECM) fuses, if the fuses are OK, then replacing the ECM relay should take care of the problem.
- Engine Light ON (or Service Engine Soon Warning Light)
P0685 Honda Description
P0685 Honda Information for specific Honda models
Need more help?
Do you need more help with the P0685 Honda code? Ask a question to our users or find an automotive repair shop near you to help fix the OBDII code