What does code P0679 mean?

Q: What does code P0679 mean?

Cylinder 9 Glow Plug Circuit. P0679 indicates that the engine control module has detected an open circuit, short to ground, or short to power on the glow plug circuit for cylinder 9 of a diesel engine. The module monitors the glow plug control circuit and sets this code when the expected current flow or voltage feedback does not match the commanded state during the glow plug preheat or afterglow phase.

DTC codes / P06xx · Computer and output circuits / P0679

P0679Cylinder 9 Glow Plug Circuit

P0679 indicates that the engine control module has detected an open circuit, short to ground, or short to power on the glow plug circuit for cylinder 9 of a diesel engine. The module monitors the glow plug control circuit and sets this code when the expected current flow or voltage feedback does not match the commanded state during the glow plug preheat or afterglow phase.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaComputer and output circuits

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