OBD-II · Engine and powertrain (P)
P0626
Generator field terminal circuit high
What it means
The alternator field (load monitor) signal to the ECU is higher than expected.
Symptoms
- battery warning light
- start-stop stops working
- slow cranking or no start
- dim lights or electrical glitches
- engine warning light
Likely causes, most likely first
| No. | Cause |
|---|---|
| 01 | alternator field/monitor wire shorted to voltage |
| 02 | faulty alternator regulator |
| 03 | connector fault |
What to check, step by step
- 01Inspect the alternator connector and field/monitor wire
- 02Check charging voltage at idle and under electrical load
- 03Test the alternator on a bench or with a charging-system tester
- 04Replace the regulator or alternator if the wiring is good