What does code P0673 mean?

Q: What does code P0673 mean?

Cylinder 3 Glow Plug Circuit. P0673 indicates that the engine control module (ECM) has detected an electrical fault in the glow plug circuit for cylinder 3. The ECM monitors the circuit for expected resistance and current draw; when the signal is out of range, it sets this code. This typically affects cold-start performance and may illuminate the check engine light.

DTC codes / P06xx · Computer and output circuits / P0673

P0673Cylinder 3 Glow Plug Circuit

P0673 indicates that the engine control module (ECM) has detected an electrical fault in the glow plug circuit for cylinder 3. The ECM monitors the circuit for expected resistance and current draw; when the signal is out of range, it sets this code. This typically affects cold-start performance and may illuminate the check engine light.

SystemPowertrain

Code typeGeneric (all makes)

SeverityLow

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.