P0627–P2632 Fuel Pump A Control Circuit/Open
The circuit is broken somewhere - a cut wire, a corroded pin or an unplugged connector means the signal never arrives.
Can you drive it? The engine light will stay on and the car may run in a reduced-power mode. Read the freeze-frame data to see the conditions the fault was logged under.
Which code is which
Same fault, different cylinder or bank — diagnosed the same way. Several set together usually means one shared cause.
| Code | Definition | Severity |
|---|---|---|
P0627 | Fuel Pump A Control Circuit/Open | Investigate soon |
P2632 | Fuel Pump B Control Circuit /Open | Investigate soon |
The definition
P0627: Fuel Pump A Control Circuit/Open.
P0627 is a powertrain code (the engine or gearbox), defined by the SAE standard - it means the same thing on any make of car, and any generic OBD-II reader will decode it.
What to check first
Cheapest and fastest checks first:
- Check the connector is fully seated and the locking tab is engaged. A half-seated plug is the single most common cause of an open circuit.
- Back-probe the pins and check continuity from the part back to the module connector.
- Inspect for a pushed-back or corroded terminal - the wire looks fine but the pin has backed out of the housing.
What actually causes this on a VAG
On most modern VAG models the in-tank fuel pump is not simply switched on and off. A separate fuel pump control module - usually mounted on or beside the pump, under the rear seat or in the boot floor depending on the model - varies pump speed on command from the engine ECU. This code means the command circuit between the ECU and that control module reads as open: the ECU switched its output and could not confirm anything was on the other end. Symptoms range from nothing you would notice, through long cranking and hesitation, to cutting out or a no-start.
Most likely causes, in order
- Wet or corroded connector at the pump or control module. This is the common one and the cheapest to check. Water gets past the tank flange seal, a rear light seal or a blocked scuttle drain, and the plug under the rear seat or boot floor corrodes. Lift the cover and look for damp, for green or white powder on the pins, and for a pin pushed back out of the housing, before ordering anything at all.
- Blown fuse or a poor supply to the pump circuit. The fuel pump circuit usually has its own fuse and relay, and on many VAG models they are not in the main dash panel - check the boot and under-seat fuse positions listed for your car as well. A few pounds and five minutes, and worth doing before any part is bought.
- Broken wire in the loom between ECU and tank. The run passes under the seats and through grommets where it can chafe or be pinched by seat rails, subwoofers or spare-wheel-well work. Suspect this particularly if the code appeared soon after anything was fitted in the boot or under the back seat.
- Failed fuel pump control module. The module itself gives up, often after that same damp. Switch the ignition on and listen: the pump should prime audibly for a second or two. Silence, with the fuse and supply already proven good, points at the control module or the pump. This is the expensive end of the list, so prove the three above first.
Worth knowing: On some models the pump and its control module are only sold together as one assembly, so it is worth having the connector properly inspected first - a repaired plug can cost a fraction of the price. Do not put this off, though: a fuel pump control that drops out intermittently can stall the car in moving traffic. The same circuit reported as "high" (P0629) is diagnosed the same way, with the addition of a check for the command wire touching a live feed.
Reading the code is the easy part
A code names the circuit that complained. What tells you why is watching the sensor behind it while the engine runs — and that is where a code reader stops and a diagnostic tool starts.
VAGPULSE reads every module in a VW, Audi, Skoda or SEAT — not just the engine — shows the live measuring blocks behind this fault, gives you the freeze-frame conditions it was logged under, and clears it once you have fixed it. It also does what a generic OBD reader cannot on a VAG: service resets, coding, adaptations, and Stage 1–3 flashing with your original file saved first.
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Common questions
What does P0627 mean?
P0627 means Fuel Pump A Control Circuit/Open. The circuit is broken somewhere - a cut wire, a corroded pin or an unplugged connector means the signal never arrives.
Can I drive with P0627?
The engine light will stay on and the car may run in a reduced-power mode. Read the freeze-frame data to see the conditions the fault was logged under.