What does code P28A2 mean?

Q: What does code P28A2 mean?

Cylinder 5 Ion Current Sense Circuit Low. P28A2 indicates that the engine control module has detected an abnormally low voltage on the ion current sense circuit for cylinder 5, which is used to measure combustion quality through ionization current. The circuit's signal is below the expected threshold, preventing the module from accurately assessing cylinder 5's combustion events.

DTC codes / P28xx · Transmission / P28A2

P28A2Cylinder 5 Ion Current Sense Circuit Low

P28A2 indicates that the engine control module has detected an abnormally low voltage on the ion current sense circuit for cylinder 5, which is used to measure combustion quality through ionization current. The circuit's signal is below the expected threshold, preventing the module from accurately assessing cylinder 5's combustion events.

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.