What does code P28C2 mean?

Q: What does code P28C2 mean?

Ion Sense Module Supply Voltage High. P28C2 indicates that the ion sense module has detected a supply voltage that is higher than the manufacturer's expected range, typically above 5.5 volts or battery positive under certain conditions. The powertrain control module (PCM) sets this code when the voltage on the ion sense module's power circuit exceeds the calibrated threshold, which can disrupt the module's ability to accurately measure ionization current in the combustion chamber.

DTC codes / P28xx · Transmission / P28C2

P28C2Ion Sense Module Supply Voltage High

P28C2 indicates that the ion sense module has detected a supply voltage that is higher than the manufacturer's expected range, typically above 5.5 volts or battery positive under certain conditions. The powertrain control module (PCM) sets this code when the voltage on the ion sense module's power circuit exceeds the calibrated threshold, which can disrupt the module's ability to accurately measure ionization current in the combustion chamber.

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.