What does code P28A7 mean?

Q: What does code P28A7 mean?

Cylinder 6 Ion Current Sense Circuit High. P28A7 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the ion current sense circuit for cylinder number 6. The ion current sensing system monitors the electrical conductivity of the combustion gases immediately after the spark event to assess combustion quality, and a high voltage reading suggests an open circuit, a short to voltage, or a faulty sensor interface.

DTC codes / P28xx · Transmission / P28A7

P28A7Cylinder 6 Ion Current Sense Circuit High

P28A7 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the ion current sense circuit for cylinder number 6. The ion current sensing system monitors the electrical conductivity of the combustion gases immediately after the spark event to assess combustion quality, and a high voltage reading suggests an open circuit, a short to voltage, or a faulty sensor interface.

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.