What does code P28AB mean?

Q: What does code P28AB mean?

Cylinder 7 Ion Current Sense Circuit High. P28AB indicates that the engine control module has detected an abnormally high voltage on the ion current sense circuit for cylinder 7. The ion current sense system uses a small current across the spark plug gap after combustion to measure ionization, which helps the computer assess combustion quality and detect misfires; a high signal means the circuit is reporting more current than expected, often due to a short to voltage or a faulty sensor.

DTC codes / P28xx · Transmission / P28AB

P28ABCylinder 7 Ion Current Sense Circuit High

P28AB indicates that the engine control module has detected an abnormally high voltage on the ion current sense circuit for cylinder 7. The ion current sense system uses a small current across the spark plug gap after combustion to measure ionization, which helps the computer assess combustion quality and detect misfires; a high signal means the circuit is reporting more current than expected, often due to 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.