What does code P1679 mean?

Q: What does code P1679 mean?

Drive by Wire MIL Circuit Open. P1679 on a GM vehicle means the powertrain control module (PCM) has detected an open circuit in the malfunction indicator lamp (MIL) control wire that runs from the PCM to the instrument cluster. The PCM commands the check engine light on during bulb check or when a fault sets, and it monitors the circuit for expected voltage; an open circuit prevents the lamp from illuminating as commanded.

DTC codes / GM codes / P1679

P1679 · GMDrive by Wire MIL Circuit Open

P1679 on a GM vehicle means the powertrain control module (PCM) has detected an open circuit in the malfunction indicator lamp (MIL) control wire that runs from the PCM to the instrument cluster. The PCM commands the check engine light on during bulb check or when a fault sets, and it monitors the circuit for expected voltage; an open circuit prevents the lamp from illuminating as commanded.

SystemPowertrain

Code typeGM specific

SeverityLow

Fix difficultyIntermediate

AreaComputer and output circuits

Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.