Try to slowly lift and at the same time tap gently on the controller, there is a small relais inside that somethimes is wornout.Thats always the first thing i check.
UHD is a 4 wheel truck i quess, check if the front right wheel is turning smoothly and check the 2 sensors(there should be 2 green lights on the dash to show the direction its in)Also check if the drivewheel sensors are in range.
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