P0627 means Fuel Pump A Control Circuit/Open. The computer has detected an open or fault in the circuit it uses to control the fuel pump or fuel pump control module. It is a generic OBD-II code, so the definition is the same on any make, but the most likely cause varies by engine; confirm with a scan tool and the service information for your vehicle before buying parts.
What P0627 means
Modern vehicles have many control modules that share information over a network, usually called the CAN bus. Codes starting with U mean a module has stopped hearing another one, and voltage and processor codes mean a module is not getting clean power or has an internal fault. Low battery voltage, poor grounds, blown fuses and damaged wiring cause many of these codes, so test the battery and charging system first.
P0627 symptoms
- No start or long cranking
- Stalling
- Loss of power
Common causes of P0627
- Failed fuel pump relay or control module
- Open wiring or a corroded connector
- Blown fuse
- Failing fuel pump
How to diagnose P0627
- Listen for the pump to prime with the key on
- Check the fuse and relay
- Check the control circuit and connectors
- Measure fuel pressure
Can you drive with P0627?
Not reliably; the engine may stall without warning.
P0627 tips
On vehicles with a fuel pump control module, the module and its connector are common failure points; check them along with the pump.
Will P0627 clear itself?
If the fault stops, the computer turns off the check engine light by itself after several drive cycles without seeing it again, and the code stays in memory as history for a while. Clearing P0627 with a scan tool after a repair is fine, but if the cause is still there the code returns, sometimes within one drive. Disconnecting the battery also clears codes on most vehicles, but it erases learned fuel trims and idle settings as well.
Related codes
| Code | Meaning |
|---|---|
| P0230 | Fuel Pump Primary Circuit |
| P0087 | Fuel Rail/System Pressure Too Low |
| P0190 | Fuel Rail Pressure Sensor A Circuit |
Guides that help
When it is more than a sensor
Voltage and network codes come from wiring, the battery, the charging system or a module, not from engine or transmission wear. If a lost-communication code has left the transmission in limp mode, rule out the module and wiring before deciding the unit has failed, and see our transmissions only if testing confirms internal damage.
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