What causes a P0627 code?

P0627 can be triggered by several issues — see the verified probable causes and step-by-step diagnostics shared by mechanics and owners on OBDIY.

Can I drive with a P0627 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0627 active.

Follow the step-by-step diagnostic on this page, then read the verified fixes contributed by other Heavy Truck owners — the answer marked "Verified Cause" worked for the original poster.

OBDIY

OBD-II

P0627

Fuel Pump Control Circuit Open Condition

What it means

The Engine Control Module (ECM) has detected an open circuit, shorted circuit, or excessive resistance in the fuel pump relay control circuit or the high-pressure fuel pump actuator circuit.