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It seems to go away when it's hot. I noticed my engine brake comes on a lot. I don't have it in tow mode. I can not really hear it in the cab when I'm driving. I really don't know about the codes;
If I am going around 40 mph and let up on the fuel pedal the exhaust brake seems to kick in. The tow button is not in. I have not noticed any other driving problems. I thought when I had the work done with the mini max setup change exhaust system and chip. 3200 dollars worth. I wanted better mileage which has happened. It also sounds like a siren coming from the transmission when starting out.
I just went out and started the truck up and there was no sound for maybe 5or 6 seconds and then the sound. The pyro on the on the mini max was bouncing around at between 250 and264.
All the gauges are normal and the heat is normal everyware.