A method of detecting the motion of a vehicle (13) of which at least one wheel unit (11) of said vehicle is equipped with a motion detection element (D) that generates a motion signal (20) when the vehicle is in motion, including: establishing (19) a collection of characteristics of parasitic signals (Sp) stored in the wheel unit; comparing each motion signal (20) from the wheel unit (11) against the collection (19) of parasitic signals (Sp) stored in memory; and sending to a vehicle central processing unit (17) only those wheel unit signals (16) that are not present in the collection of parasitic signals.