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Symptom: P1645-GLOW DISPLAY OPEN CIRCUIT When Monitored and Set Condition: P1645-GLOW DISPLAY OPEN CIRCUIT When Monitored: During wait to start lamp operation. Set Condition: The ECM detects an open or short to ground on the wait to start lamp control circuit. NOTE: This code may set if the ASD/Diesel Power Relay contacts stick POSSIBLE CAUSES CHECK FOR OTHER DTCS INTERMITTENT CONDITION GLOW PLUG LAMP CONTROL CIRCUIT SHORTED TO GROUND GLOW PLUG LAMP CONTROL CIRCUIT OPEN ENGINE CONTROL MODULE CHECK THE GLOW PLUG LAMP BULB MESSAGE CENTER TEST ACTION APPLICABILITY 1 NOTE: This DTC may set if the ASD/Diesel Power Relay contacts stick All Yes → Refer to the Symptom List for diagnosis of the other DTCs before No → 2 Turn the ignition on. All Yes → No → 140 DRIVEABILITY - DIESEL |