What does P0621 mean?

This code refers to a problem with the 'L' terminal lamp control circuit for the generator. This circuit often illuminates the battery warning light.

• Faulty lamp or bulb in the circuit
• Wiring issue to the 'L' terminal
• Generator internal fault

Click steps to track your progress.

1. 1

   Check the battery warning lamp for proper function.

2. 2

   Inspect the wiring for the 'L' terminal of the generator.

3. 3

   Test the generator's 'L' terminal output.

4. 4

   Professional diagnosis may be required.