P0625 code meaning
Generator Field/F Terminal Circuit Low
What P0625 means
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.
P0625 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0625
- Battery warning lamp on
- Battery not or incorrectly charged, starting problems
- Raised or fluctuating idle
- Check engine light on some Ford variants
Common causes of P0625
- Most likelyF line open or shorted to ground, connector corroded
- Most likelyRegulator or alternator faulty or not charging (brushes, field winding)
- PossibleAlternator B+ feed missing or high resistance
- Less likelyEngine module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
AlternatorVoltage regulatorGenerator wiringEngine control module
What each part of P0625 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 6 | Area: computer (engine control module) and output circuits. |
| 25 | The exact fault in that area. |
What to do next
- Note P0625 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0625
What does P0625 mean?
P0625 means "Generator Field/F Terminal Circuit Low". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P0625?
P0625 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P0625 fail an emissions test?
P0625 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P0625 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will P0625 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.