What does code P28BE mean?

Q: What does code P28BE mean?

Cylinder 12 Ion Current Sense Circuit Low. P28BE indicates that the engine control module has detected an abnormally low voltage on the ion current sense circuit for cylinder 12, which is part of the ignition system used to monitor combustion quality. The circuit typically generates a small current across the spark plug gap after the spark event, and a low signal means the module cannot reliably measure ionization, often due to a fault in the sensor, wiring, or spark plug itself.

DTC codes / P28xx · Transmission / P28BE

P28BECylinder 12 Ion Current Sense Circuit Low

P28BE indicates that the engine control module has detected an abnormally low voltage on the ion current sense circuit for cylinder 12, which is part of the ignition system used to monitor combustion quality. The circuit typically generates a small current across the spark plug gap after the spark event, and a low signal means the module cannot reliably measure ionization, often due to a fault in the sensor, wiring, or spark plug itself.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

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.