Circuit/System Description

This DTC indicates the hybrid/EV powertrain control module 1 has set a DTC. The hybrid/EV powertrain control module 1 sends a message via the serial data circuit to the ECM requesting illumination of the MIL. When the ECM receives the message, DTC P0AC4 will set. The DTC information for the ECM will only display DTC P0AC4, but the freeze frame/failure records data will display the hybrid/EV powertrain control module 1 DTC that is set.