I decided to join again since there's a wealth of knowledge shared on this forum. I have an 09 GMC Sierra SLT 180,000 miles and the truck is going into limp mode and I was hoping somebody might have had prior experience with this code. It is U0101. The information on my dash is (check Stabilitrac), (Service Traction Control), and I seem to have no communication with transmission? If anybody has any ideas, that would be great.