P0626 code meaning
Generator Field/F Terminal Circuit High
Powertrain system Generic code P06xx codes Check engine light
What P0626 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. P0626 means the F feedback is too high – a duty cycle near 100 % when little or no field current is expected, typically a short to battery voltage. The Saab 9-4X sets it with ignition on and engine off above 65 % for 15 s, Saab's ME9 above 65 % for 3 s with the engine running, and raises the idle speed. Chrysler fixed P0626 on the 2019 Ram 3500–5500 chassis cab 6.7 L Cummins by reprogramming, as part of a check engine light bulletin; Ford's 6.8 L V10 reports it with or without the lamp. The former obdex title 'Performance' was wrong – all lists and manufacturers use 'High'.
P0626 at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.3 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0626
- Battery or check engine lamp (Chrysler/Ford partly with MIL)
- Raised idle
- Possibly overvoltage or overcharging with a regulator fault
- Often no driving symptoms
Common causes of P0626
- Most likelyF line shorted to battery voltage (chafing), connector
- Most likelyRegulator faulty (field permanently on, possibly overcharging)
- PossibleEngine module software (Ram 6.7 L 2019)
- Less likelyModule input faulty
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 P0626 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. |
| 26 | The exact fault in that area. |
What to do next
- Note P0626 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 P0626
What does P0626 mean?
P0626 means "Generator Field/F Terminal Circuit High". 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 P0626?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P0626 fail an emissions test?
P0626 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 P0626 to fix?
Difficulty: medium. A typical repair takes 0.3 to 2.5 hours of work. This is a job for a workshop.
Will P0626 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.