Turbo underboost P0299 issue?

[Ycheck]

Bought a 2020 3500 CC/DRW in Sept 2020. and keep getting turbo underboost dtc (P0299). Taking to dealership Monday to have them look at it but anyone have any ideas? Appreciate any feedback. Thanks

 

[elephantrider]

have you had the recalls done yet?

 

[Ycheck]

Took it in last week for routine oil change, oil filter and fuel filters and dealership said no recalls were active.

 

[Deleted member 80]

Are you running the OEM air filter? I have read instances where an aftermarket filter can trip this code.

 

[Ycheck]

Are you running the OEM air filter? I have read instances where an aftermarket filter can trip this code.

Stock air filter. 1st time was around 1200 miles. Was out of town when it happened and called selling dealership for advice and they said to just clear code since it was still making boost. 16k miles later- on another trip this week the same code came back so I reset it and came back in less than 400 miles for a 3rd time so I'm leaving engine light on until I take take it in Monday so they can see it's on and hope to identify what it is and make repair.

 

[Ycheck]

Checked air filter and it isn't dirty, IMO

 

[elephantrider]

unfortunately, your probably looking at another dealer visit.

 

[Ycheck]

Will be there Monday. Was reading a few forums about similar issue on the 19's and seems to be a known issue.

 

[elephantrider]

it is i believe, but most was resolved with the updates. good luck.

 

[Ycheck]

Thanks!

 

[Ycheck]

Dealership said they found TSB and re-flashed PCM. I went ahead and had them replace air filter while I was in there. Will see if it comes back...

 

[2021hdram]

Replying for anyone else. I have a 21 2500 and been to the dealership 3 times for this issue. First they said there was an issue with the manifold and replaced the gasket and tightened it down, code came back a day later, they said the egr was stuck open and replaced that. A day later the light came back on and now they are swapping out the turbo.