P0627 code meaning
Fuel Pump A Control Circuit/Open
Powertrain system Generic code P06xx codes Check engine light
What P0627 means
What 'fuel pump A control circuit' means differs by maker: at GM gasoline 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 gasoline 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 gasoline 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.
P0627 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P0627
- Engine does not start or stalls
- Lack of power or stumbling under load
- Pump not audible with ignition on
- Check engine light on
Common causes of P0627
- Most likelyFuel pump relay or pump driver module faulty
- Most likelyWire or connector to relay or pump open or corroded (tank, underbody)
- PossibleFuel pump itself (winding open, overheated)
- PossibleFuse or ground point
- Less likelyDriver in the engine module faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel pump relayFuel pump driver moduleFuel pumpEngine control module
What each part of P0627 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. |
| 27 | The exact fault in that area. |
What to do next
- Note P0627 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 P0627
What does P0627 mean?
P0627 means "Fuel Pump A Control Circuit/Open". What 'fuel pump A control circuit' means differs by maker: at GM gasoline 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 gasoline 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P0627?
Drive gently and only to a workshop. With P0627 the car can go into limp mode (reduced power) to protect itself.
Will P0627 fail an emissions test?
Yes, it can. P0627 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0627 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0627 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.