I was heading out today, stopped at my neighbors talked for a bit and went to leave. It was pretty cold today, when backing up I spun my wheels a little bit, put it in drive and in two seconds the service fwd light came on and the coolant temp on the display went to it's (default setting) 100 degree and the gauge went to zero. I drove to town about 20 miles everything else was working. I've been in two wheel mode this whole time. I shut the truck down re-fired it and it's been normal. Anybody knows what happened, did I dirty a anti-lock brake sensor, traction control, not spin the wheels enough? And what is the relation between the temp sensor and fwd service light.