Conditions for Setting the DTC
WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
C0274 54 or C0280 54
The calculated solenoid valve temperature is greater than the threshold.
C025F 00 or C0274 4B
The isolation solenoid valve is not learned.