P0689 ISUZU – Engine Controls Ignition Relay Feedback Circuit Low Voltage

P0689 ISUZU Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P0689 ISUZU 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 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.