DEF Shelf Life!
Just a quick tip for those that are new to Diesels with all of the newer emission controls. DEF apparently has a shelf life and using anything other than DEF bought from the dealer may void your warr...
Forum Discussion
Yes the problem was apparently the NOx sensor but if they would have determined that the fluid in the tank was bad GM apparently would not have covered the issue under warranty. I am not a 100% sure but I think that burning poor DEF will cause the sensor to fail. I was really p/o when I found this out. I was ready to put the truck on the selling block and head to another manufacturer or back to a Gasser. But cooler heads prevailed and I was able to get it fixed for now. Hope the DEF light stays out.
