P0689
Powertrain Codes
P0689 - ISUZU - Engine Controls Ignition Relay Feedback Circuit Low Voltage
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
Possible Causes
- Engine controls ignition relay control circuit is open or shorted - Faulty ignition switch - ECM malfunction - Faulty relay
Tech Notes
Check all the ECM fuses, if the fuses are OK try replacing the ECM relay.