P0627 critical

Fuel Pump A Control Circuit Open

The P0627 code means the vehicle's onboard diagnostic system has detected: Fuel Pump A Control Circuit Open. This is a critical severity code.

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Keep driving?: No -- stop driving
DIY difficulty: hard
Estimated cost: $100 - $800 (parts and labor)

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Common Symptoms

Check Engine Light on
Fuel pump not running - engine will not start
Vehicle may enter limp mode
Possible no-start condition

Probable Causes (Ranked by Likelihood)

Open circuit in fuel pump A relay or wiring Very High
Wiring damage or corrosion in the circuit High
Poor electrical connection at module or component Moderate
ECM or control module internal failure Low

Step-by-Step Diagnostic Procedure

Use a scan tool to read data related to Fuel Pump A Control
Inspect all related wiring, connectors, and grounds for damage, corrosion, or loose connections
Measure circuit voltage, resistance, and continuity to identify the fault type
Check for technical service bulletins related to this code for your specific vehicle

Frequently Asked Questions

Can P0627 prevent my car from starting?

Yes, if the fuel pump cannot operate due to this circuit fault, the engine will crank but not start because no fuel is being delivered to the fuel rail. You may hear the fuel pump priming sound absent when turning the key to ON.

Where is the fuel pump relay?

The fuel pump relay is typically located in the underhood fuse/relay box or in a relay center under the dashboard. Check your owner's manual for the exact location. It is often labeled 'FUEL PUMP' on the relay box cover.

Can I test the fuel pump relay?

Yes. Swap it with another identical relay in the fuse box (such as the horn or AC relay). If the fuel pump works with the swapped relay, the original relay is faulty. You can also test the relay with a multimeter and 12V power source.