I get the same message on my dash information center. I went to the scale and noticed I still had 2500 lbs before I hit the 15,000 GCWR. I also have a 2022 Silverado LT Crew Cab with he 5.3 engine. I have pictures of my weight at the scale with trailer and my information plate from the door of the truck. In case you have issues I will list my weights below:
Steer Axle: 3200 LB
Drive Axle: 3240 LB
Trailer Axle: 6060 LB
Gross Weight: 12500
My information plate states:
GAWR FRT 3800 LBS
GAWR RR 3800 LBS
GCWR 15000 LBS
Any answers on why this is happening? I will also email you the information.