My Citroën C3 won’t start and the check engine light doesn’t come on when I turn the key. Which fuse is crucial for powering the Engine Control Unit (ECU)?

THE Electronic Fuel Injection Control Unit (ECU)The engine control module, or ECM, is the “brain” of the car. If it’s not powered, the car won’t start, and the check engine light won’t come on as it should during the initial check-up.

• Focused Model: Citroën C3 (First and Second Generation).
• Location of Protection: The ECU power fuse (which protects against voltage spikes and internal faults) is located in Engine Service Module (BSM), under the hood, near the battery.
• Correct Fuse: The fuse for the injection control unit is usually the… F8 (or a higher amperage fuse, such as 30A(depending on the year).

Diagnosis: If the fuse F8 (or 30A) If the ECU burns out, the module is de-energized. Without the ECU, there is no ignition or fuel injection, and system communication is cut off, resulting in the car not starting.. Attention: This fuse rarely blows by accident and may indicate an internal short circuit in some component managed by the ECU (such as a shorted fuel injector), requiring professional diagnosis before simple replacement.