OBD-II Code · Charging
P0620
Generator Control Circuit
high severitySafe to drive$200-$700
Alternator field/control circuit fault.
Common symptoms
- Battery light
- CEL
- Charging issues
Likely causes
- Failed alternator
- Wiring
- Regulator
Where to start
- Try the cheapest cause first. Start by checking: failed alternator.
- Cost & scope. $200-$700
- If the code returns after the fix: escalate to a shop or scanner with live-data and freeze-frame. A code that re-sets means the underlying fault is still there.
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