Lost all speed and message pops up "Reduced power"

[Rusty2009]

Found this

The diesel particle filter system filters harmful soot particles out of the exhaust gases.
The system includes a self-cleaning function that runs automatically during driving without any notification.
The filter is cleaned by periodically burning off the soot particles at high temperature.
This process takes place automatically under set driving conditions and may take up to 25 minutes.
Typically it needs between 7 and 12 minutes. Fuel consumption may be higher during this period.
The emission of smells and smoke during this process is normal.
Under certain driving conditions, e.g.
short distances, the system cannot clean itself automatically. If the cleaning of the filter is required and if previous driving conditions did
not enable automatic cleaning, it will be indicated by the control indicator %.
Simultaneously Particulate Filter Is Full. See Owner's Manual or warning code 55 appears in the Driver Information Center.
% illuminates when diesel particle filter is full. Start cleaning process as soon as possible.
% flashes when diesel particle filter has reached the maximum filling level. Start cleaning process immediately to avoid damage to the engine.