Powertrain, generic · Computer and auxiliary outputs

P0627 Fuel Pump A Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

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.

Likely causes

Fuel pump relay or pump driver module faulty
Wire or connector to relay or pump open or corroded (tank, underbody)
Fuel pump itself (winding open, overheated)
Fuse or ground point
Driver in the engine module faulty

Symptoms

  • Engine does not start or stalls
  • Lack of power or stumbling under load
  • Pump not audible with ignition on
  • Check engine light on

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–700
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel pump relayfuel pump driver modulefuel pumpengine control module

Related codes

P0628P0629P062AP0230P025AP064A

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com, fordservicecontent.com.