What does code P28B8 mean?

Q: What does code P28B8 mean?

Cylinder 11 Ion Current Sense Circuit. P28B8 indicates that the engine control module (ECM) has detected an abnormal signal on the ion current sense circuit for cylinder 11, which is used to monitor combustion quality and detect misfires. The ECM compares the ion current feedback to expected values and sets this code when the circuit voltage or current falls outside the valid range.

DTC codes / P28xx · Transmission / P28B8

P28B8Cylinder 11 Ion Current Sense Circuit

P28B8 indicates that the engine control module (ECM) has detected an abnormal signal on the ion current sense circuit for cylinder 11, which is used to monitor combustion quality and detect misfires. The ECM compares the ion current feedback to expected values and sets this code when the circuit voltage or current falls outside the valid range.

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.