OBD-II code · Powertrain (generic)
P0622 Generator Field F Control Circuit
The control circuit for the generator field terminal (F) reports a fault. The ECM cannot regulate field current as expected.
Is it safe to drive with P0622?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyField circuit open or shorted
- PossibleAlternator regulator fault
Symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–2.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Alternator, Alternator Wiring
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.