P0685 ISUZU – Engine Control Module Power Relay Control Circuit Open

P0685 ISUZU Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P0685 ISUZU Possible Causes

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

P0685 ISUZU Description

The Engine Control Module (ECM) monitors the power inputs. The ECM sets the OBDII code when the ECM remains powered up after the ignition switch has been turned OFF.