P0685
Powertrain Codes
P0685 - VOLKSWAGEN - Electronic Control Module Power Relay Control Circuit Malfunction
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
Possible Causes
- ECM power control circuit is open or shorted - Failed ECM power relay - Failed ECM
Tech Notes
Check all the ECM fuses, if the fuses are OK try replacing the ECM relay.
Description
The Engine Control Module (ECM) has detected that the ECM remains powered up after the ignition key has been turned off