P0627 Fuel Pump A Control Circuit/Open

P0627 indicates an open or general fault in Fuel Pump A control circuit. The controller cannot command or monitor the primary fuel pump control path correctly.

Code details

Generic OBD-II · P0

System: Computer
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace the fuel pump until power, ground, command, and fuel pressure response are tested.

Symptoms of P0627

Check-engine light, sometimes with several unrelated codes at once.
Warning lights, a no-start, or intermittent electrical faults.
Communication or module-reset problems on a scan tool.

Common causes of P0627

Low battery voltage, poor grounds, corroded connectors, or blown fuses.
Wiring or network (CAN bus) faults between modules.
A module software/programming issue, or rarely a failed controller.

Useful checks before replacing parts

Check fuel pump command, relay or module output, pump current, fuel pressure, inertia or safety inputs, freeze-frame data, and related fuel pressure codes.
Inspect pump relay, fuse feed, control module, ground path, connector corrosion, tank harness, pump load, and wiring damage near the fuel tank.
Command the pump where supported and verify electrical output, current draw, and actual fuel pressure response.

Related OBD-II codes

These nearby computer entries can help compare wording and pin down the fault area.