Turbo overboosting

[Martin313]

Was on the turnpike pulling my 8k 5th wheel camper running 70mph driving right into a strong wind, when the truck would downshift to get more power for a incline turbo would boost up to 30 and then kick out throw PT0427 wich on my edge insight tells me that turbos overboosting. Got off an exit shut truck off and started back up ran fine 3hrs later did it again. drove another 400 miles still hauling never did it again. Are the vains getting bad and need cleaned? Do i have a sensor thats just going bad? Truck is stock except straight 4inch exhaust

[sinner6.0L]

Your vanes are probably sticking. can you watch VGT duty cycle?

[Martin313]

not that i'm aware of unless i dont know how to do it? i had a guy that works on them tell me that two and then i had another guy tell me it was my mass sensor because of my straight exhaust makes psi lot more then what the computer says its sapost to be didn't know if this was possible since it only did it twice? thanks for your help just trying to figure this out before my 2200 mile trip then end of november

[SharkDiver]

I bet its the vanes sticking also. My turbo did that a few times before i cleaned it, It hasnt done it since then.