P0620Severity: Medium
P0620 – Generator (Alternator) Control Circuit
A fault in the alternator control circuit.
What it means
There's a problem in the control circuit between the ECU and the alternator. Charging can't be managed properly; voltage instability may occur.
Symptoms
- Battery warning light
- Voltage fluctuation
- Hard starting
- Check-engine light
Common causes
- Faulty alternator/regulator
- Wiring/connector issue
- Power/ground fault
- ECU output fault
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Frequently asked questions
What does trouble code P0620 mean?
P0620 – Generator (Alternator) Control Circuit. There's a problem in the control circuit between the ECU and the alternator. Charging can't be managed properly; voltage instability may occur.
Can I drive with a P0620 code?
You can usually drive short distances, but it's best to have it checked before it gets worse.