What does code P28A0 mean?

Q: What does code P28A0 mean?

Cylinder 5 Ion Current Sense Circuit. P28A0 indicates that the powertrain control module has detected an abnormal signal from the ion current sense circuit for cylinder 5, which is used to monitor combustion quality and detect misfires. The circuit typically measures ionization current across the spark plug gap after ignition, and this code means the expected current signature was outside the programmed range.

DTC codes / P28xx · Transmission / P28A0

P28A0Cylinder 5 Ion Current Sense Circuit

P28A0 indicates that the powertrain control module has detected an abnormal signal from the ion current sense circuit for cylinder 5, which is used to monitor combustion quality and detect misfires. The circuit typically measures ionization current across the spark plug gap after ignition, and this code means the expected current signature was outside the programmed range.

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.