I just picked up a 2009 Silverado 1500 with a 4.8 and a monster cam... 232/238 wth .625 lift. It was put together before I bought it.... So when coming off throttle it will disable the traction control, as well as stabilitrak. It also tosses a code C0299-5A Brake boost regulation pressure sensor plausibility failure. Is there any way that the low vacuum from the cam is causing that issue? if so would a vacuum can, or a vac pump help or fix it?

 

Its definitely possible. What is odd though is when letting off the throttle your vacuum should be greatest.

 

I agree but if its highest level still is not enough, would that be causing the issue?

 

Do you have any more info on the cam? Do you know what the LSA is??? Was it just slapped in straight up or advanced/retarded??? Any one degree it or verify it was cut properly?

 

the work was done before I bought the truck so no idea.