cummins-dodge
New member
2012 3500 6spd 133,000 mile the exhaust brake doesn't work most of the time but it kicks in every time on cold mornings I cleaned back pressure sensor and tube and nothing changed
More than likely an exhaust leak before turbo
Not as much back pressure at idle so it will work
I've seen problems with tuning cause this, as well as bad turbos. My recommendation would be to try different tuning first because its cheaper than a new turbo. The H&S can cause a lot of problems and may not allow positioner codes to set. I have a 2013 in the shop right now that is doing the almost exact same thing you are talking about. H&S tuner.
try different tuning first because its cheaper than a new turbo