What does code P0620 mean?
A malfunction is detected in the alternator or generator control circuit.
OBD-II Code
P0620 — Generator Control Circuit Malfunction
A malfunction is detected in the alternator or generator control circuit.
Common symptoms
- Battery not charging
- dim lights
- multiple electrical faults
Possible causes
- Faulty alternator
- failing voltage regulator
- loose or damaged wiring
Initial recommendation
Test alternator output, inspect charging control circuit and PCM commands.
Safety notice
This information is for guidance only and does not replace a physical vehicle inspection or diagnosis by a qualified mechanic. If the vehicle has severe power loss, smoke, a fuel odor, overheating, brake or steering problems, or any unsafe behavior, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine code P0620 with your vehicle's actual symptoms for more complete diagnostic guidance.
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