Technical Definition:
Engine Control Module (ECM) / Powertrain Control Module (PCM) Power Relay Control Circuit / Open
Trouble Code: P0685
Address: 0x0685
System: Powertrain
Subsystem: Computer and Auxiliary Output Circuits
Address: 0x0685
System: Powertrain
Subsystem: Computer and Auxiliary Output Circuits
Technical Description:
Possible Causes:
Possible Symptoms:
Electronic Control Module Power Control Circuit Malfunction
Possible Solutions:
OBD-II Trouble Code Type:
Diagnostic Step:
Tech Notes:
– Faulty Engine Control Module (ECM) power relay
– ECM power relay harness is open or shorted
– ECM power relay circuit poor electrical connection
– Faulty (ECM)