DTC Parameters

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

• The condition exists for longer than 15 seconds.
• The engine is running.

The generator L-terminal output voltage at the PCM is greater than 4 volts when:

• The condition exists for longer than 5 seconds.
• The engine is NOT running.

DTC P0621 diagnostic runs continuously with the ignition ON. DTC P0621 is a type "D" DTC.