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.
- Verify DTC P0621 is not set.
- Ignition On - Engine Off
- Engine Running - Less than 3000 RPM - Generator F-Terminal Signal = Less than 5% - For 30 s