P0625 — Generator Field Terminal Circuit Low
Seen on: Heavy Truck
Generator Field Terminal Circuit Low. Common causes: Alternator field circuit shorted.
Your code rides along, so nearby mechanics see the fault before they quote you.
How serious is it?
Serious. Power derate likely — plan to stop soon.
Most likely causes
- Alternator field circuit shorted
- Wiring short to ground
First moves (roadside)
- Check field circuit for ground fault
- replace alternator
FAQ
Generator Field Terminal Circuit Low. Common causes: Alternator field circuit shorted.
Serious — Power derate likely — plan to stop soon.
The most common cause is: Alternator field circuit shorted. Other possibilities include Wiring short to ground.
Power derate likely — plan to stop soon. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Find a mechanic or related guides
General diagnostic guidance for diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack and more). Not a substitute for a scan-tool diagnosis on your specific truck.