billyf

I have a 2001 Sierra SLT and have same problem. Side detection seems to work alright on shorter trips. I travel a few trips a year over a thousand miles each way. On these longer trips after an hour or so it stops working. When stopping to refuel it seems to work again for an hour or so. The message appears side detection temporarily unavailable. I have had it to dealership 2 seperate times for that problem with no cure. They told me they updated system. But hard to diagnose with problem not occurring while at dealership. With only 23000 miles on vehicle i think the problem should be taken care of. This is the first vehicle I owned with this feature. When getting accustomed to using it you tend to depend on it,and when it stops working it can be dangerous.