Ok, those are some slightly different circumstances than what I experienced. I had some major rain lead to my problem (got a Service Shifter message). Dealer found a Radio Frequency Hub Module that was wet & failed. Not saying the same thing could be to blame, but the location on the rear cab wall, the known problem with leaky 3rd brake lights on some trucks & the amount of systems the RFHM controls makes some crazy warnings appear. That's why I was asking if you had any more error messages show up. Only getting a service transmission message might be something specific to the transmission or its controller.