P0627: Fuel pump A control: circuit open or faulty
The ECU detects a fault or a break in the circuit that switches the fuel pump on. Usually the relay, a fuse, the wiring or the pump itself.
| Code | P0627 |
|---|---|
| System | Engine and transmission |
| Group | P06xx, Control unit and auxiliary outputs |
| Type | Generic: it means the same on every make |
| Can you keep driving? | Better not |
What P0627 means
The ECU switches the fuel pump on, sometimes directly and sometimes through a relay or a separate pump control module. This code means that control circuit is open or not responding properly. Exactly which pump is A is up to each manufacturer.
Most common causes
- Faulty fuel pump fuse or relay
- Pump or pump module plug loose or corroded
- Broken wire between the ECU and the pump or its module
- Faulty fuel pump control module
- Faulty fuel pump
Symptoms
- Engine warning light on
- Engine will not start, or starts and stalls
- Hesitation or lack of power when accelerating
- No pump hum when you switch the ignition on
Can you drive with P0627?
Better not The engine could cut out suddenly while driving through lack of fuel. Best not to drive until it has been checked.
Open the bonnetthe in-depth explanation
How to check it
Switch the ignition on without starting and listen for a short hum from the pump near the fuel tank. If you hear nothing, check the pump fuse and relay before suspecting the pump itself.
How to read and clear P0627 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P0627 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P0623 The generator light control has an electrical fault
- P0624 The circuit controlling the fuel filler cap warning lamp has a fault
- P0625 The generator field terminal gives a lower signal than normal
- P0626 The generator field terminal gives a higher signal than normal
- P0628 The fuel pump A control gives a lower signal than normal
- P0629 The fuel pump A control gives a higher signal than normal
- P062A The fuel pump A control gives readings outside the normal range
- P062B The internal control unit fuel injector control gives readings outside the
- P0600 Serial communication link fault
- P0601 Internal control module memory checksum error
- P0602 Control module programming error
- P0603 Internal control module keep alive memory (KAM) error
To understand it properly
We explain how that system works, with drawings and no waffle, in our mechanics guide: Fuel.
What does code P0627 mean?
The ECU switches the fuel pump on, sometimes directly and sometimes through a relay or a separate pump control module. This code means that control circuit is open or not responding properly. Exactly which pump is A is up to each manufacturer.
Can you drive with P0627?
The engine could cut out suddenly while driving through lack of fuel. Best not to drive until it has been checked.
How do you clear P0627?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P0627 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
