What does code P28BC mean?

Q: What does code P28BC mean?

Cylinder 12 Ion Current Sense Circuit. P28BC indicates that the engine control module has detected an abnormal signal on the ion current sense circuit for cylinder 12, which is used to monitor combustion quality and detect misfires. The circuit typically measures ionization current across the spark plug gap after ignition, and this code sets when the voltage or current reading falls outside the expected range.

DTC codes / P28xx · Transmission / P28BC

P28BCCylinder 12 Ion Current Sense Circuit

P28BC indicates that the engine control module has detected an abnormal signal on the ion current sense circuit for cylinder 12, which is used to monitor combustion quality and detect misfires. The circuit typically measures ionization current across the spark plug gap after ignition, and this code sets when the voltage or current reading falls outside the expected range.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

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