I have an 06 cummins that I am out of ideas on. The truck has hardly any power at all but it keeps throwing a p0299 code then putting it in limp mode until I reset it. I have replaced the map sensor, fuel filter, air filter, turbo, pressure tested intake system,did a valve adjustment, had the dealer check ecm ect... Engine seems to run fine but doesn't boost up...get about 12lbs at 17,000 psi rail pressure. truck is stock. has banks intake, intercooler and exhaust but that's about it. previous owner did have banks tuner in it but that is off and computer was reflashed. Also has cummins exhaust brake and a gearvendors but I don't think they would be a culprit...and ideas. im getting ready to light it on fire soon!!!!