P0622 Generator Field Not Switching Properly

SYMPTOM
P-0622 GENERATOR FIELD NOT SWITCHING PROPERLY

WHEN MONITORED
With the ignition key on and the engine running.

SET CONDITION
When the PCM tries to regulate the generator field with no result during monitoring.

POSSIBLE CAUSES
- Generator defective
- Generator field driver circuit open
- Generator field driver circuit short to ground
- Generator field source (+) circuit open or has high resistance
- Powertrain control module defective
- Generator wiring harness intermittent defect
- Generator wiring harness observable defect