OBD-II code · Powertrain (generic, extended)
P2635 Fuel Pump A Low Flow / Performance
The ECU detects insufficient fuel flow from fuel pump A. Either the pump is worn out, the supply line is restricted, or the pressure regulator does not allow proper flow.
Is it safe to drive with P2635?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyWorn fuel pump
- PossibleClogged fuel filter
- Less likelyPressure regulator fault
Symptoms
- Check engine light on
- Hard start, no start, or stalling under load
- Power loss especially at high load or rpm
- Possible long cranking time
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2.5 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Fuel Pump, Fuel Filter, Fuel Pressure Regulator
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.