I need your help.

I have Opel vectra sw 1.9 cdti 2006

light engine is always connected

I have several errors in the ecu but what appears to me is this:

U2103 - CAN-Bus Circuit Malfunction
U2106 - CAN-Bus No Communication with TCM (Transmission Control Module)
U2108 - CAN-Bus No Communication with ABS (Anti-Lock Brake System)
U2143 - CAN-Bus No Communication with SAS (Steering Angle Sensor)
P0400 - Exhaust Gas Recirculation Flow Insufficient Detected
B3794 - Switch Cruise Control Circuit Malfunction
B1635 - Passenger Mirror Horizontal Motor Circuit Low Voltage
U2100 - No Communication with CAN-Bus (Mid Speed)

None of them can eliminate

Please help.