P0620 OBD II Trouble Code Generator Control Circuit Malfunction

How to easily diagnose, repair, and info on causes of a P0620 trouble code that indicates a detected failure of the generator control electrical circuit.

Symptoms of P0620 OBD II Trouble Code

  • Engine drivability issues
  • Engine stall when idling
  • Delayed engine cranking (especially when cold)
  • Other stored codes

Common Causes of P0620 OBD II Trouble Code

  • Faulty PCM
  • PCM programming error
  • Open or shorted generator control circuit
  • Failed generator assembly
  • Insufficient control module ground

Severity of P0620 OBD II Trouble Code

Internal control module codes must always be taken seriously. A stored code P0620 could result in a variety of drivability concerns, including a no-start and/or dead battery condition.