I know my HPOP is weak, only holding about 1500psi at WOT, but I'm wondering why I don't get a code for it. I have gotten the 1211 code only a couple times in the 2 years I've owned the truck. It just got me wondering if I have something not reading correctly to set the code. Is the ICP sensor what the PCM uses to set a code or not set a code? Do most tuners make it so that the code is not set? I thought I saw it on DP tunes that it wouldn't set the code, but wasn't sure about others.