I have a 2018 GMC 2500 heavy…
I have a 2018 GMC 2500 heavy duty. It has a problem with exhaust fumes going in the cab ever since I bought it when it gets into that mode where the exhaust fumes are coming into the cab. It is burning double the fuel after about 30 km. It goes back to normal. I took my truck in when it was under warranty. So many times they told me it was all in my head and it's my fault that it was doing that. This was at the dealership in Chatham, Ontario on the corner of Kyle drive and grand ave. They do not treat you like a customer I. Spent almost $92000 for that truck. All they did was give me the runaround. Even when the service manager that originally was there before installed the goose. Neck assembly in the back of my truck. He did not put it in properly. And the one acre broke when it was hooked up to my trailer. When I turned a corner sharp I had to replace it at my cost. That is not right. They have done a lot of dirty deeds there with me but they never fix my truck. And it still does that today? Burns, double the fuel and you get exhaust fumes when I went on Google, there are thousands of people. They had the same truck as mine with the dura max 3/4 ton. And they all had problems with exhaust coming in the cab. General motors never fix that. And that's not right, and my truck still does that today. I will never buy anything from that dealership again. They should be coming good and fixing my truck like they should have done from day one when it was under warranty