What does code P28BB mean?

Q: What does code P28BB mean?

Cylinder 11 Ion Current Sense Circuit High. P28BB indicates that the engine control module has detected an abnormally high current on the ion current sense circuit for cylinder 11, which is used to monitor combustion quality. The circuit is reporting a signal above the expected range, which can be caused by a short to voltage, a faulty sensor, or a wiring issue.

DTC codes / P28xx · Transmission / P28BB

P28BBCylinder 11 Ion Current Sense Circuit High

P28BB indicates that the engine control module has detected an abnormally high current on the ion current sense circuit for cylinder 11, which is used to monitor combustion quality. The circuit is reporting a signal above the expected range, which can be caused by a short to voltage, a faulty sensor, or a wiring issue.

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.