The fuel pump is an essential component of the internal combustion engine. In fuel injection engines, electric pumps mounted inside the fuel tank are used. There are vehicle models that have two fuel pumps: one high pressure and one low pressure. If the fuel pressure is not within the established specifications, it will not have the expected efficiency to achieve the right operation of the engine.
The Engine Control Module (ECM) continuously monitors the operation of the fuel pump control circuit. In case it detects that the fuel pressure is out of the expected range, the DTC P2635 OBDII code will be set.