OBD-II Code P0627 — What It Means & How to Fix It

What Does This Error Mean?

P0627 means the fuel pump control circuit has an open — meaning the circuit is broken and not completing properly. The engine computer controls the fuel pump through a relay or directly through a driver circuit. When that control circuit is open, the fuel pump may not turn on at all. Without fuel, the engine will not start or will stall. This code requires prompt attention — the engine needs fuel to run.

Affected Models

All vehicles 1996+
Common in GM vehicles with ECM-controlled fuel pumps
Common in Ford vehicles
Common in Chrysler and Dodge vehicles
Common in vehicles with fuel pump driver modules (FPDM)

Common Causes

Blown fuel pump relay fuse or failed fuel pump relay not providing power to the pump
Open circuit (broken wire) in the fuel pump control wiring
Faulty Fuel Pump Driver Module (on vehicles equipped with one)
Corroded or disconnected fuel pump connector at the tank
Failed ECM fuel pump control output

How to Fix It

Check the fuel pump fuse and relay first. Locate them in the fuse box (under the hood or in the cabin). Swap the relay with a matching one from another circuit to test.

A blown fuel pump fuse is one of the most common causes of a no-start condition and is a $1 fix.
Turn the key to On (not Start) and listen for a short buzzing hum from the fuel tank area — this is the fuel pump priming. No hum suggests no power is reaching the pump.

Have someone help you listen near the rear of the car — it is brief, lasting about 2 seconds.
Locate the fuel pump electrical connector, usually at the top of the fuel tank or through an access panel inside the car. Check the connector for corrosion or damage.

On some vehicles, there is an access panel under the rear seat or cargo floor that allows inspection without dropping the tank.
Check for voltage at the fuel pump connector when the key is turned to On. You should see battery voltage. No voltage points to the relay, fuse, wiring, or ECM control output.

Confirm ground is also present at the connector — both power and ground are required.
If the fuel pump driver module is equipped, test it according to the manufacturer's procedure. Replace it if it has failed. If the control wiring and module are good but voltage is absent, suspect the ECM output.

On Ford vehicles, the Inertia Fuel Shutoff (IFS) switch may have tripped after a bump — check and reset it before further diagnosis.

When to Call a Professional

Fuel system diagnosis and repair ranges widely in complexity. A blown fuse or bad relay costs $5 to $25 to fix. A failed fuel pump driver module costs $100 to $250 for the part. Fuel pump replacement costs $200 to $500 for parts plus $100 to $300 labor depending on tank access. If the ECM fuel pump driver has failed, ECM replacement costs $200 to $600 or more.

Frequently Asked Questions

Will my car start with P0627?

Usually no. If the fuel pump is not receiving power, no fuel is being delivered to the engine. The engine will crank but not start — or it may start briefly and die as it runs on leftover fuel in the lines.

What is a Fuel Pump Driver Module?

Some vehicles — especially Ford trucks — use a separate Fuel Pump Driver Module (FPDM). This module sits between the ECM and the fuel pump and controls pump speed. When the FPDM fails, the pump gets no control signal and stops working. It is a relatively common failure point on Ford F-150 and Super Duty trucks.

Can I check the fuel pump myself?

Yes, with basic tools. A fuel pressure gauge (available at auto parts stores for rent or purchase) lets you check if the pump is building pressure. Connect it to the fuel rail test port and turn the key to On. A healthy pump should build 30 to 65 PSI within a couple of seconds.