Conditions for Setting the DTC
WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
The vehicle must sit at least 6 h before the system goes to propulsion system active. At propulsion system active, if the ECM did not receive feedback from the Hybrid/EV Powertrain Control Module 2 that the alarm clock was set, and any one of the three wake-up timer events did not occur, then the DTC fails.