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P0620 P0xxx · パワートレーン (P) 重大度中
Generator Control Circuit Malfunction
The ECU commands the alternator but does not see the expected response — typical on smart-charging systems where the regulator is ECU-controlled.
重大度の目安: 中 — 走行性または排出ガスに影響。今週中に点検を予約してください
確認できる症状
- Battery warning lamp
- Flat battery
- Dim lights
- Charging voltage not responding to command
主な原因
可能性の高い順に並んでいます。上から順に確認してください。
- 1 Failed alternator regulator
- 2 Open or shorted LIN/PWM control wire
- 3 Slipping or broken drive belt
- 4 Faulty battery current sensor
点検・修理の手順
費用が安く侵襲の小さい項目から — これらのコードの大半は部品の問題ではありません。
- ✓ Check belt condition and tension first.
- ✓ Inspect the control wire between ECU and alternator.
- ✓ Command the alternator with a scan tool and watch charging voltage respond.
- ✓ Test the battery and the current sensor on the negative terminal.
修理の選択肢
- Replace the alternator or regulator
- Repair the control wiring
- Replace the belt or battery current sensor
P0620 — よくあるご質問
Why does the battery go flat overnight only? +
If charging works when driving, suspect a parasitic drain instead — that is a different test entirely.
Can I fit a standard alternator? +
Not on smart-charging vehicles; the ECU needs to command output or the fault stays.