What does code P28AD mean?

Q: What does code P28AD mean?

Cylinder 8 Ion Current Sense Circuit Range/Performance. P28AD indicates that the engine control module (ECM) has detected an out-of-range or performance fault in the ion current sense circuit for cylinder 8. The ECM uses this circuit to measure ionization current at the spark plug, which helps detect misfire and optimize combustion, so the code means the signal from that cylinder is not behaving as expected.

DTC codes / P28xx · Transmission / P28AD

P28ADCylinder 8 Ion Current Sense Circuit Range/Performance

P28AD indicates that the engine control module (ECM) has detected an out-of-range or performance fault in the ion current sense circuit for cylinder 8. The ECM uses this circuit to measure ionization current at the spark plug, which helps detect misfire and optimize combustion, so the code means the signal from that cylinder is not behaving as expected.

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.