What does code P0674 mean?

Q: What does code P0674 mean?

Cylinder 4 Glow Plug Circuit. P0674 indicates that the engine control module (ECM) has detected a fault in the electrical circuit for the cylinder 4 glow plug, which is used in diesel engines to warm the combustion chamber for reliable cold starts. The ECM monitors the glow plug circuit for expected current draw and voltage feedback, and when the readings fall outside the programmed range, it sets this code and typically illuminates the glow plug or check engine light.

DTC codes / P06xx · Computer and output circuits / P0674

P0674Cylinder 4 Glow Plug Circuit

P0674 indicates that the engine control module (ECM) has detected a fault in the electrical circuit for the cylinder 4 glow plug, which is used in diesel engines to warm the combustion chamber for reliable cold starts. The ECM monitors the glow plug circuit for expected current draw and voltage feedback, and when the readings fall outside the programmed range, it sets this code and typically illuminates the glow plug or check engine light.

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.