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Tuf Toy 12-14-2008, 07:01 PM Truck threw codes P0299 Mod$00 Turbo under boost and P0191 Mod $00 MAF or VAF A CKT Range/ Perf Truck had very little throttle response , but was able to get it home in the garage . Anyone else throw this code .. how serious is it . I have 30100. on an LBZ 2006 . drchris1978 12-16-2008, 07:14 AM I throw this code every day. Its a turbo underboost code, probably EGR related? Santa is bringing me EFILive so I will shut these codes off with EFI. Kennedy 12-16-2008, 09:33 AM A list of vehicle mods would help. There have been some issues with frosting/icing the inlet port of the boost sensor with the LBZ/LMM configuration/sensor location. Tuf Toy 12-16-2008, 09:40 AM Mine is bone stock , except for a K&N air filter and 285 BFG AT tires darrynjb 12-23-2008, 08:08 PM http://www.dieselplace.com/forum/showthread.php?t=281607 hope this helps out a bit. i had the turbo underboost code. dealership said it was condensation on the sensor. | ||