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So I have made it halfway across the us so far and o my come up with one code p0299 it happened when climbing the mountains in Tennessee I got the underboost code what causes this to happen? I cleared the code and it hasn't come back so far.
Any help is greatly appreciated
It may have needed cleaning and the mountain exercise got rid of some of the coking. Exercise the truck every now and then. If the code doesn't return you may have dodged the bullet.
