OBD-II code · Powertrain (generic)
P0625 Generator Field Terminal Circuit Low
Voltage on the alternator F terminal (field excitation) is below threshold — open or short to ground in the excitation path.
Is it safe to drive with P0625?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyField circuit open or shorted to ground
- PossibleAlternator brushes worn
- Less likelyConnector pins corroded - high contact resistance
Symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Alternator, Alternator Wiring
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.