P0299 Code 5.9 Cummins- Turbo Underboost

This code can be caused due to sensor problems or a problem with the stock turbo; but most often appears after installing an aftermarket turbo which can provide boost levels outside of the ranges the ECM is programmed for.  This code can be resolved with custom tuning.

See my tuning in action…

High Altitude 12 Valve Tune Cold Start

An early version of my towing tune…