What does code U0673 mean?

Q: What does code U0673 mean?

Lost Communication With Ion Sense Module. U0673 means the engine control module (ECM) has lost the communication signal it expects from the ion sense module, a component used on some engines to detect combustion quality through the spark plug circuit. The ECM sets this code when the dedicated data line or module response goes missing for a calibrated period, not when the sensor simply reports an out-of-range reading.

DTC codes / U06xx · Network communication / U0673

U0673Lost Communication With Ion Sense Module

U0673 means the engine control module (ECM) has lost the communication signal it expects from the ion sense module, a component used on some engines to detect combustion quality through the spark plug circuit. The ECM sets this code when the dedicated data line or module response goes missing for a calibrated period, not when the sensor simply reports an out-of-range reading.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaNetwork communication

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