P0627Fuel Pump A Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- What 'fuel pump A control circuit' means differs by maker: at GM petrol engines it is the control line from the engine module to the fuel pump relay (high-side driver), at GM's LML diesel the lift pump, at Ford petrol engines with a pump driver module the secondary circuit from that module to the pump (reported as a duty cycle on a monitor line), and at Ford's 6.7 L diesel (F-650/750) the high or low side of the pump relay. P0627 is the open or general circuit fault. GM measures with the relay driver on and sets the code at 200 kΩ or more after 8 of 10 samples at 250 ms – after two trips in 2018, in the first trip in 2025; some modules also set P0629. Ford's petrol pump module reports an open, short or overheating in its secondary circuit (2012: 80 % duty cycle, 2–5 s), Ford's 6.7 L diesel an open relay side within 0.2 s. Without the pump the engine does not start or stalls.
- What you may notice
- Engine does not start or stalls
- Lack of power or stumbling under load
- Pump not audible with ignition on
- Check engine light on
- Likely causes
- LikelyFuel pump relay or pump driver module faulty
- LikelyWire or connector to relay or pump open or corroded (tank, underbody)
- PossibleFuel pump itself (winding open, overheated)
- PossibleFuse or ground point
- RareDriver in the engine module faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.