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HELP. P0299 DTC code on startup when truck idles.

4K views 4 replies 4 participants last post by  ai17828 
#1 ·
Ok need help for the .org. Bought my 06 250 in March. Every month since I bought it I get the DTC P0299 turbo under boost. Been showing up about once a month. The code only shows when I start the truck and it's running at idle. Talked to a local diesel mechanic about it and he said that it can't be he turbo because there is no boost created at idle. I never lose power or anything when the code shows up. So what should I start checking/cleaning to make this code quit appearing?
 
#4 ·
P0299 is EBP originated, and yes there is boost and EBP at idle, not much but it's there and the PCM is looking for a certain amount. You are most likely looking at a frozen/stuck unison ring that could free up when all the turbo parts heat up and expand. I see this quite often actually. Warmed up the turbo moves free, let it sit overnight and it sticks open a little bit. Warm up on a cold engine wants high EBP/VGT duty cycle, if the unison ring is stuck where it was when you shut it down hot it will generate an underboost code.
 
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