BCelina

The current def level is about 2/3 full. But there is an alert on the GMC app "DEF Range Low". There is no alert on the Drivers Information Center (DIC) about DEF however, I read that the DIC only displays low range alerts at 1000 & 300 miles to empty. So, I am interpreting with 2/3 full DEF tank, I am within 1000 and 300 miles on DEF range.

New '23 GMC AT4 with 3.0 Diesel... I have the same issue with a full Def tank, but an alert "DEF Range Low" in the App. At 1219 total miles on the truck, I had to fill the def tank (DIC said 198 miles remaining). I have driven another 500 miles (total 1721 miles) and am down 1/3 DEF tank already. My dealer says this is normal, but I think this is quite excessive.