Yes I have a 2020 GMC 3.0 with 30K miles just completed a 2000 mile trip from Texas to Phoenix Arizona. I used 8 2.5 containers of DEF. The gauge showed the tank empty but was full. A engine light came on so I pulled into Royal GMC in Tucson. Nice friendly people.. They cleared the code and reset the DEF system so I was on my way. 400 miles down the road the DEF light came on again so I pulled over to more DEF in the tank and again it was full but the gauge showed empty. I was pulling a 14 foot flat bed trailer with a golf cart on it. The dealership did not have the part to repair the truck. When I got back home and took it back to the dealership and gave them the paperwork provided by Royal GMC they said without a code they could not help me. Still as this date the DEF gauge now shows full but pops up on the dash saying I only have 252 miles to empty. This is the 3rd of 4th time this truck has been in some GM shop for the same problem. Just wondering if there is a fix..
