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 shorted
- Generator field driver circuit open
- Generator field driver circuit shorted to ground
- Generator field source (+) circuit open
- Powertrain control module defective
- Generator wiring harness intermittent defect
- Generator wiring harness observable defect