P0272 P0278 P0281 and over pressurizing coolant tank
 

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Okay so I'm pretty sure I have a bad head gasket. These are the codes that I'm getting and I'm also getting coolant over pressurizing the coolant tank. I know these are all telltale signs of a bad head gasket but I'm trying to confirm before I rip the cab off my truck and replace the head gaskets and studs. Any help would be much appreciated. Thanks guys