SLOPONY

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?

Vortec350ss

iTrader: (20)

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

SLOPONY

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

1FastBrick

iTrader: (17)

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?

SLOPONY

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