What does code P28B6 mean?

Q: What does code P28B6 mean?

Cylinder 10 Ion Current Sense Circuit Low. P28B6 indicates that the engine control module has detected an abnormally low voltage on the ion current sense circuit for cylinder 10, which is used to measure combustion quality through ionization at the spark plug gap. The circuit is reporting a signal below the expected threshold, preventing the module from accurately assessing misfire or knock events on that cylinder.

DTC codes / P28xx · Transmission / P28B6

P28B6Cylinder 10 Ion Current Sense Circuit Low

P28B6 indicates that the engine control module has detected an abnormally low voltage on the ion current sense circuit for cylinder 10, which is used to measure combustion quality through ionization at the spark plug gap. The circuit is reporting a signal below the expected threshold, preventing the module from accurately assessing misfire or knock events on that cylinder.

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.