P0626Generator Field/F Terminal Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- How the car detects it
- 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'.
- What you may notice
- Battery or check engine lamp (Chrysler/Ford partly with MIL)
- Raised idle
- Possibly overvoltage or overcharging with a regulator fault
- Often no driving symptoms
- Likely causes
- LikelyF line shorted to battery voltage (chafing), connector
- LikelyRegulator faulty (field permanently on, possibly overcharging)
- PossibleEngine module software (Ram 6.7 L 2019)
- RareModule input faulty
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.