P0689 Code: Meaning, Causes, and Symptoms | OBD2 Codes

P0689 – Electronic Control Module Power Relay Sense Circuit Low


P0689 Possible Symptoms


Engine Light ON (or Service Engine Soon Warning Light)


P0689 Possible Causes


Weak battery,Low voltage while cranking,Faulty Engine Control Module (ECM) relay,Blown ECM fuse,Faulty ECM,ECM harness is open or shorted,ECM circuit poor electrical connection


P0689 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.