Code: P 0299 Modules: ECM Description: Turbocharger Engine Underboost I got the dreaded P0299 code over the weekend. The truck ran no differently. I did a little research and found that the Hypertech tuners like to throw that code. I cleared the code, and went out and hit the accelerator hard a few times from a stop to help clear out the soot. It seems to be running fine. I have no gauges as of yet, so I cannot tell if I actually have a low boost issue. Just going by the seat of the pant driveability.