Bmw e46

[pedriii]

Hi guys, the bmw e46 again gives problems. This time it turns on dsc light, temperature to the maximum, alternator light on and does not indicate revolutions, I get fault that there is no communication between the dde and the instrument panel.But if I try one of the other ecu that I had paired with the car I get fault 4b90 and it does not start.Has this happened to you?Thank you.
Good guys, the bmw e46 again gives problems. This time it turns on dsc light, temperature to the maximum, alternator light on and does not indicate revolutions, I get fault that there is no communication between the dde and the instrument panel.But if I try one of the other switchboards that I had paired with the car I get fault 4b90 and it does not start.Has this happened to you?Thank you.

[oldford]

4b90 is Rail Pressure Control at engine start.
When the pressure is too low when cranking the engine, it will not start.

[pedriii]

The strange thing is that it happens with one ECU and with the other it starts but there is no communication Can with the instrument panel