I have a couple codes keep coming back after I clear them.
DTC codes 0299 is a low boost code..... but what are 0401,0403??

Those are EGR codes, do you have exhaust upgrades? If so you may need the EGR plate and Finger sticks. if you don't then you probably have something faulty and need to see the dealer.

go here to look at the codes..
http://www.obdii.com/codes.html

good luck

Yes I have a 4 inch mbrp exhaust with cat removed. Still don't understand where the 0299 code keeps coming from. I don't care about the egr codes really but I don't want the service engine light on. I have a power pup for correcting speedo for tires 285's and a juice/attitude for power upgrades.

joe496chevy;

I had exactly the same codes come up on mine over the weekend. Took it to the dealer today, and he said it has to do with the turbo, and how long it stays "on". He thinks it's cleared, but can't promise. Said if it comes back, may need a new computer. BTW, I looked at the site briano supplied, and the PO299 code doesn't exist. Maybe it is year specific........?

all these codes will set with the exhaust upgrades u listed. get a fingers stick and u will b good. i had the same problem. John

This maybe a dumb question, but are these codes the same for the LB7s