P0625 Code: Generator Field Terminal Circuit — Causes & Fix
P0625 means a fault at the generator (alternator) field terminal circuit — the field/regulator control connection is faulty.
- Applies to
- All OBD-II vehicles (any make or model)
- Est. repair cost
- $50 – $700
- Time to fix
- 1–4 hours
What it means
Causes include a failed regulator/alternator, a corroded field terminal, or wiring faults. P0625 is a generic OBD-II code defined in the SAE J2012 standard, so it applies to virtually any 1996-or-newer OBD-II vehicle regardless of make. Fix the underlying fault, then clear the code with an OBD-II scan tool — it will return if the problem isn't resolved.
Symptoms
- Check engine light and/or battery light
- Charging problems
- Flickering lights
How to fix it
- 1
Inspect the field terminal wiring
1. Check the alternator field/regulator terminal and wiring for corrosion or breaks.
- 2
Replace the alternator/regulator
1. Replace if the regulator/alternator is faulty, then clear the code.
Frequently asked questions
Is P0625 an alternator problem?
Usually — it points at the alternator field/regulator circuit. Check the terminal and wiring, then the alternator itself.
Last updated July 19, 2026
Guidance only — always consult a qualified professional or the official service manual before carrying out repairs.