What does code P0685 mean?

ECM/PCM Power Relay Control Circuit/Open: The ECM power relay control circuit is open — ECM may lose power intermittently.

P0685 is rated as critical severity. Stop driving — risk of damage or safety hazard.

P0685

ECM/PCM Power Relay Control Circuit/Open

Powertrain Code · Critical

What does P0685 mean?

The ECM power relay control circuit is open — ECM may lose power intermittently.

System: ECU

P0685 is a powertrain diagnostic trouble code indicating ecm/pcm power relay control circuit/open. This code is classified as critical severity, which means: stop driving — risk of damage or safety hazard.

Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your vehicle.