Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
FPCM (Fuel Pump Control Module)
FPCM (Fuel Pump Control Module) controls fuel pump discharge rate according to the actual fuel requirements of the engine and, as a result, the idling power of the electric fuel pump is significantly reduced.
This control unit consists of a control and power electronics unit. FPCM is connected to the fuel pump, the fuel pressure sensor, and drivetrain CAN communication line.
FPCM regulates the fuel pump as required and transmits information on the current fuel pressure to ECM.
The fuel pump is switched ON when a fuel pump ON signal is received by the FPCM. The signal is transmitted by ECM as a CAN signal via the drivetrain CAN communication line and as a ground signal.
FPCM additionally receives the fuel requirements signal from ECM via drivetrain CAN communication. FPCM registers the current fuel pressure via a voltage signal from the fuel pressure sensor and transmits this information via the drivetrain CAN to ECM.
FPCM evaluates the current fuel pressure, compares it to the specified fuel pressure, and actuates the fuel pump with a PWM signal so that the actual value corresponds to the specified value.
The vehicle and engine variants are stored in FPCM. After replacing FPCM, it is necessary to perform the variant coding registration.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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