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Buickpuller 04-26-2005, 11:01 PM My truck is setting all EGR codes and P0299 which is underboost. When light is on truck runs terrible like turbo is not working. Is this normal when light is on? When clear code truck comes back to life. Jeff 2005 Duramax 2500HD CrewCab Wolford 04-27-2005, 12:37 AM that could be an engine limp mode which is cause by low rail pressure(i think). But is not the Limp MOde that is commonly referred to on this website(That LImp Mode has to do with the Allison) briano 04-27-2005, 11:43 AM nope, thats not limp mode. Do a search for 0299 and you will find info on it.. like this.. http://dieselplace.com/forum/showthread.php?t=23844&highlight=0299 | ||