What Does P0627 Mean?
The PCM has detected an open circuit in the fuel pump 'A' control circuit. This means the PCM is unable to command the fuel pump relay or fuel pump driver module to operate. The engine may not start or may stall due to loss of fuel delivery.
Safety Warning
Engine may not start or may stall unexpectedly during driving, creating a dangerous loss-of-power situation. Do not drive until resolved.
Common Causes
35%
Failed fuel pump relay
25%
Open or damaged wiring between PCM and fuel pump relay/driver module
25%
Faulty fuel pump driver module (FPDM)
15%
PCM fuel pump driver circuit failure
Diagnostic Steps
1
Step 1: Locate the fuel pump relay in the fuse/relay box. Swap it with an identical relay and retest — if the code clears and the pump operates, replace the relay.
2
Step 2: With the relay removed, use a DVOM to check for PCM control signal at the relay socket control terminal — should see ground pulse when cranking.
3
Step 3: Check for battery voltage at the relay socket power terminals (constant B+ and switched B+). If missing, trace and repair the power feed circuit.
4
Step 4: If the vehicle uses a fuel pump driver module, check the wiring between the PCM and FPDM for continuity. Verify the FPDM ground is solid (less than 0.1 ohm to chassis).
5
Step 5: Verify fuel pump operation by applying direct 12V to the pump connector at the tank — if the pump runs, the pump itself is good and the control circuit is at fault.
Estimated Repair Cost
$50 - $800
Parts + labor, varies by vehicle and location
The PCM has detected an open circuit in the fuel pump 'A' control circuit. This means the PCM is unable to command the fuel pump relay or fuel pump driver module to operate. The engine may not start or may stall due to loss of fuel delivery.
The most common cause of P0627 (Fuel Pump "A" Control Circuit /Open) is: Failed fuel pump relay
Typical repair costs for P0627 range from $50 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Engine may not start or may stall unexpectedly during driving, creating a dangerous loss-of-power situation. Do not drive until resolved.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0627 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System
Difficulty
Type
Generic (SAE)
Recommended Tools
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