What does code P28C0 mean?

Q: What does code P28C0 mean?

Ion Sense Module Supply Voltage Circuit. P28C0 indicates that the ion sense module has detected an out-of-range voltage on its dedicated supply circuit, which is used to power the ion current measurement electronics inside the combustion chamber. The engine control module (ECM) monitors this supply voltage and sets the code when it falls below or rises above the expected operating window, typically because of a wiring fault, poor connection, or a failing ion sense module.

DTC codes / P28xx · Transmission / P28C0

P28C0Ion Sense Module Supply Voltage Circuit

P28C0 indicates that the ion sense module has detected an out-of-range voltage on its dedicated supply circuit, which is used to power the ion current measurement electronics inside the combustion chamber. The engine control module (ECM) monitors this supply voltage and sets the code when it falls below or rises above the expected operating window, typically because of a wiring fault, poor connection, or a failing ion sense module.

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.