Re: q51 2013 tahoe brand new and Trim will not go back down
Have someone heavy bounce on the drive while someone else is pushing the drive down button and the pump is running. It will most likely go down.
Problem could be when you put the drive up and you just hold the button up and the pump really pressurizes and you just leave it that way. Then the valves can stick while sitting for some time over pressurized like that.
Next time you put the drive up, once all the way up, just click down for a sec. to relieve the over pressure on the pump. Then it should work next time.