P0625Generator Field/F Terminal Circuit Low
- Generic OBD-II code · Powertrain
- How the car detects it
- The alternator regulator is linked to the engine module by an L (turn-on) line, an F (field) line reporting field load as a duty cycle, or on newer cars a LIN bus. P0625 means the F feedback is too low: with the engine running the regulator reports (almost) no field duty cycle – typically an open or grounded F line, or the alternator is not charging. The Saab 9-4X sets it below 3000 rpm when the duty cycle stays under 5 % for 15 s; Saab's T8 when it stays under 0.5 % for over 30 s with the L line active, and raises the idle speed. Ford's 6.8 L V10 reports it with or without the check engine light depending on the variant. GM's newer engines combine low and high in P0622.
- What you may notice
- Battery warning lamp on
- Battery not or incorrectly charged, starting problems
- Raised or fluctuating idle
- Check engine light on some Ford variants
- Likely causes
- LikelyF line open or shorted to ground, connector corroded
- LikelyRegulator or alternator faulty or not charging (brushes, field winding)
- PossibleAlternator B+ feed missing or high resistance
- RareEngine module
- Repair
- Medium · Usually a job for a workshop.Typical cost: €30 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.