Ford Transit Connect 1.8 TDCI MOTOR VEHICLE PLEASE!

Hello guys, Since this morning suddenly the red light of the immobilizer flashes in the attempt to start the car, the starter rotates, but the car doesn’t start. Are there any other possibilities besides the instrument cluster or the motor control unit?That’s quite surprising that the car was still running yesterday, was parked and suddenly no longer running on the next day someone may know a Macke or something like that. I’m grateful about answers. Lg Lennart