If you just had your tranny fluid changed that might be the "problem". I've seen another post or two on here that talked about not so top shelf service on fluid changes. I recently had service done to my coach. I wanted the tranny filters changed and the tranny topped off with transsynd. Well, they dumped the transynd, only had 25k miles on it, changed the filters, and refilled with transynd. I picked up the coach and drove it for a couple miles to get everything going. I stopped and check the tranny fluid via the shift pad. It read back that I was 8 qts low. I drove back to the service center, they checked the fluid via the tranny dip stick and it was almost full.
I took the service manager inside the coach and gave him a lesson on how to check the tranny fluid with the shift pad. He was speechless and had never seen how this worked.
Bottom line: they added the appropriate amount of fluid to get a full reading on the pad.
Lesson learned: we all need to be aware that service folks may not be aware of the electronic capability for checking our tranny fluid level. Obviously, the dip stick will reflect a much lower level than the pad on a *complete* fluid change. If you have a fluid change make sure you check the tranny fluid with the shift pad before you drive too far away from the service folks.