What does code P28B7 mean?

Q: What does code P28B7 mean?

Cylinder 10 Ion Current Sense Circuit High. P28B7 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the ion current sense circuit for cylinder 10, which is used to monitor combustion quality. The circuit typically produces a small current signal during the combustion event, and a high voltage reading suggests an open circuit, a short to voltage, or a faulty sensor.

DTC codes / P28xx · Transmission / P28B7

P28B7Cylinder 10 Ion Current Sense Circuit High

P28B7 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the ion current sense circuit for cylinder 10, which is used to monitor combustion quality. The circuit typically produces a small current signal during the combustion event, and a high voltage reading suggests an open circuit, a short to voltage, or a faulty sensor.

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.