P0625 — Generator Field/F Terminal Circuit Low
Drive with caution — fix soon.
What P0625 means
P0625 means your car's computer detected low voltage in the generator field (F terminal) circuit of the alternator. The field circuit controls how strongly the alternator generates power, so a fault here can lead to undercharging and a weak or dead battery. It's usually caused by wiring problems, a failing alternator, or poor connections.
Common symptoms
- Check Engine light is on
- Battery or charging warning light may appear
- Dim headlights or flickering dash lights
- Battery that drains or won't hold a charge
- Electrical accessories underperforming
Common causes
- Faulty alternator or internal voltage regulator
- Low voltage or open in the field (F terminal) wiring
- Corroded or loose connectors at the alternator
- Poor ground connection
- Fault in the engine control module (PCM/ECM)
Typical repair cost
$150 – $650
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0625 code?
For short trips, usually yes, but don't rely on it for long drives. The field circuit issue can cause your alternator to undercharge, draining the battery and risking a breakdown. Get it checked soon and keep trips short until the charging system is confirmed healthy.
How much does it cost to fix a P0625 code?
Repairs typically range from $150 to $650. Fixing wiring or a connector is the cheaper option, while replacing the alternator costs more. A proper diagnosis will determine whether it's a wiring fault or the alternator itself before any parts are replaced.
Is a P0625 code serious?
It's a moderate concern worth handling soon. If the alternator undercharges, your battery can die and leave you stranded, which is the main risk. Addressing it early keeps the repair manageable and helps you avoid an unexpected breakdown.
What is the generator field (F terminal) circuit?
The field circuit, connected at the alternator's F terminal, controls how hard the alternator works to generate electricity. When the voltage in this circuit is too low, the alternator can't charge properly, which is what the P0625 code is flagging.