While driving one day, i noticed the tow/haul button didn't work, then the gas gauge. eventually, within a year, all the gauges stopped working. sometimes they go on and later off again. i don't know if they are even accurate to any degree when they do come on. about a year ago the truck shut off while i was driving but after i was safely off the road it started again. that has not happened since. i have tried to find the problem but as of now i have been unsuccessful. myself or my mechanic, who works for the county and is very capable. i know many people with the same or similar vehicles and this seems to be quite common. i also own a 2003 suburban and these things are starting with that truck too. these have been good trucks but i want to be safe and not have to get rid of my vehicles. abs,wipers,defrost,hvac, and all gauges are affected. i have replaced hvac controls and dash gauges and other parts but still the same problems. such as whatever hvac controls that i put in it still only works on high. watch out if your speedometer acts strange. *tr