A vehicle which cannot move (regardless of the cause) is immobilized. The process of transitioning from the normal state to immobilized is immobilization.
An immobilized vehicle functions the same as a mobile vehicle of the same kind, except that it can be given no move commands. Any move commands that it had when immobilized are nullified. On a turreted vehicle, the turret can still rotate.
There are three causes of immobilization in Combat Mission: