P0620 — Generator Control Circuit Malfunction
| Meaning | The engine computer has detected a problem in the control circuit of the alternator. This means the computer cannot properly manage or monitor the charging system that powers your electronics and keeps the battery full. |
| Family | Powertrain (P) |
Typical symptoms
Headlights may dim or flicker while driving
Battery drains or fails to hold a charge
Common causes
Loose, corroded, or damaged wiring at the alternator plug
Blown alternator fuse or fusible link
Failed engine control module
What to do
Frequently asked questions
What does code P0620 mean?
Generator Control Circuit Malfunction. The engine computer has detected a problem in the control circuit of the alternator. This means the computer cannot properly manage or monitor the charging system that powers your electronics and keeps the battery full.
Can I keep driving with code P0620 active?
With caution: limp mode possible, have it checked soon
Common causes — P0620
Faulty alternator or internal voltage regulator Loose, corroded, or damaged wiring at the alternator plug Blown alternator fuse or fusible link Failed engine control module
How do you fix code P0620?
Have a mechanic test the alternator output and check the wiring harness connected to it as soon as possible. Driving too long with a charging system fault can leave you stranded with a dead battery.
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