My first diesel, 2019 Sierra 2500HD. 42k miles. Is anyone getting fuel rail pressure codes when towing heavy loads? I've been searching and can see others getting it on older duramax's but not the L5P. (unless my search skills suck, which is a possibility). I have full warranty bumper to bumper till 115k miles. Fuel filter is brand new. It's always P0191 code.