What does code P28AE mean?

Q: What does code P28AE mean?

Cylinder 8 Ion Current Sense Circuit Low. P28AE indicates that the engine control module has detected an abnormally low voltage on the ion current sense circuit for cylinder number eight, which is used to measure combustion quality. The circuit typically produces a small signal during the spark event, and a low reading means the module cannot reliably detect ionization, often due to a faulty sensor, wiring issue, or spark plug problem.

DTC codes / P28xx · Transmission / P28AE

P28AECylinder 8 Ion Current Sense Circuit Low

P28AE indicates that the engine control module has detected an abnormally low voltage on the ion current sense circuit for cylinder number eight, which is used to measure combustion quality. The circuit typically produces a small signal during the spark event, and a low reading means the module cannot reliably detect ionization, often due to a faulty sensor, wiring issue, or spark plug problem.

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.