joebedford I am in at the start of the high elevations headed west. The more I deal with this brake issue the more I find these modern electronic systems frustrating. I am headed to the local chevy dealer in am as the trailer service place in Amarillo cannot go farther as it is now a truck electronic issue? I will mention the sensor to the chevy repair folks tomorrow. I just spent 7 hrs and 1400 dollars and still not a safe truck/trailer to drive headed west. If chevy dealer cannot give positive answer on how to fix, I am considering returing home as this issue seems elusive to all. Don't want to get in mountains and not have a dependable rig. Thanks