October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

DTC Parameters

DTC P0621 will set if the generator L-terminal output voltage at the PCM is less than 4 volts when:

The conditions exist for longer than 2 seconds.
The engine is running.

DTC P0621 diagnostic runs continuously with the engine running. DTC P0621 is a type "D" DTC.