I have a 2002 F350 7.3 with 6 speed manual Tranny... I am haveing some problems. I have just installed a Hypertech Hyper Max programmer in it the prog. checks for codes before it installs and it came up with 2 codes I have done some Research and found that code DTC #1 P1247 was Turbo Boost Pressure Low. DTC # P0591 was Cruise Control Multi Function Input B Circuit Range/ Performance. Also, I want to ask another question. My Park Brake does not engage.. any Ideas on what could be the problem there?????