It appears it is a new style fitting? Do I change anyway or just seal the cover?

 

If it were me, I’d make sure it’s tight and move on.

 

I replaced the up-pipes, HPOP cover seal, and turbo drain tube on my 2005 6.0 Powerstroke. The turbocharger and VGT actuator are brand new OEM, not reman. After the work, I ran the Key On Engine Running (KOER) test using FORScan and I'm still getting the following DTCs:

• P2263 – Turbo/Supercharger Boost System Performance
• P0299 – Turbocharger Underboost Condition

While working on the truck, I accidentally broke the plastic fitting on top of the radiator that connects to the degas bottle. It looks like I’ll need to replace the radiator unless there's a reliable way to repair that fitting. These plastic tanks don’t hold up well to stress.

I’m looking for advice from anyone who’s dealt with these codes after installing a new turbo and actuator. Also, if anyone has successfully repaired the degas fitting on the radiator, I’d appreciate hearing what worked—or if replacement is the only real option.

 

The truck needs to be driven so those codes go away. As for the Radiator, there is a way you can fix it, but you're much better off just buying a new radiator. Even better, if there's still a Radiator shop near you, they can just replace the end tank and Rod the radiator for you.

 

I bought a new radiator - may get around to putting it in this weekend, maybe. I only get those codes running the scan in forscan engine running test. I think your right, I just need to drive it.

 

After chasing persistent low boost codes (P0299) since day one, I finally nailed the culprit. Initially, I assumed the codes were false since the truck ran fine, but they were legit.
Credit goes to my son—now nicknamed “Eagle Ear”—who suspected an exhaust leak. We confirmed it using a DIY stethoscope (½" OD tubing). The leak was at the up-pipe to turbo connection, not on the charge air side as I originally thought.
Fix Details:

The up-pipe wasn’t fully seated at the turbo flange, causing a significant pre-turbo exhaust leak and low boost condition.
To correct alignment, I had to:

Remove all four exhaust manifold-to-up-pipe bolts.
Completely remove the three turbo pedestal mounting bolts and lift the turbo off the pedestal.
Reposition the up-pipe and turbo until the V-band clamp seated properly.


It took three attempts to get the clamp fully sealed. Once done, leak eliminated and codes cleared.

Lessons Learned:

Don’t overlook exhaust leaks upstream of the turbo—they’ll mimic boost issues.
A simple listening tool can save hours of diagnostics.
If you’re pulling the up-pipe, expect to remove the turbo from the pedestal for proper fitment.

Thanks to everyone who shared tips along the way—this community is invaluable.

 

Thanks for the update and closure.