P0625
Generator Field/F Terminal Circuit Low
Charging system
Generic OBD-II
Medium
What it means
P0625 means the voltage on the generator (alternator) field terminal circuit is lower than expected, which points to a charging-system problem. It's commonly a failing alternator, a wiring/connection fault at the field terminal, or a weak battery. The engine runs, but the battery may not be charging properly, so it's worth fixing before you're left with a dead battery.
Medium
Can I keep driving? Drivable short-term, but the charging system may be underperforming — a draining battery can eventually leave you stranded, so address it soon.
Common symptoms
What you'll notice
- Battery/charging warning light on
- Check-engine light on
- Dim or flickering headlights and interior lights
- Weak battery, slow cranking, or a battery that keeps discharging
Common causes
Most likely first
- Faulty alternator/generator or its internal voltage regulatorLikely
- Wiring fault or corrosion at the generator field (F) terminal circuitCommon
- Poor ground or power connection to the charging systemCommon
- Weak or failing battery skewing the charging feedbackLess often
- Faulty engine/powertrain control module driving the field circuit, rareLess often
How to diagnose & fix
Work through it in order
- Measure charging voltage at the battery with the engine running (should be roughly 13.5–14.7 V).
- Inspect the generator field (F) terminal wiring and connector for damage or corrosion.
- Test the battery and clean/tighten the battery and ground connections.
- Have the alternator bench-tested if voltage is low and wiring is good.
- Replace the alternator or repair the circuit as indicated, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0625?+
For a short distance, but if the battery light is on the charging system may not be keeping up. Plan on a diagnosis before the battery drains and the car won't restart.
Can I just clear P0625?+
It returns while the field circuit or alternator is faulty. Confirm charging voltage and fix the underlying charging problem instead of just clearing.
Related codes
Often seen with P0625
Read & clear P0625 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX