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The oil cooler is prone to leakage, it's part of the assembly that the oil filter screws onto. Best bet there is to clean everything thoroughly and then run it. You can add fluorescent dye to the oil and then look for the leak with an ultraviolet light while wearing yellow glasses. They sell...

Update: the code simply means that the truck has been started a gazillion times. You can reset it by going to VCS system protection data and resetting that line.

You hit the nail on the head. I can access truck talk now. Thanks for your help!

There are many, many differences. I question the feasibility of this swap. Are there specific burner issues you need to overcome?

No go. I cannot access the general forum, truck talk, newbies paradise. Some of the others I can.

I am posting right now in incognito mode. I cannot access the truck talk forum, but I can open threads where I replied. So weird. I'll try updating chrome.

Just as LDB showed in the third reply to this thread. I can't explain why I can access this thread but not the truck talk forum. I'm using Chrome version 115.0.5790.139 on a Google pixel 7

My post right here is the first time I've been able to access any forum in over a week.

There's no sealant, just a gasket. If the glass was replaced before, the gasket may be out of place. If you aren't concerned about aesthetics I'd just run a bead of sealant around the gasket. Your glass guy likely has a better solution.

Man, this thing has taken you for a ride. Glad you finally got it sorted out.

A Nexiq USB-Link 2 is the recommended interface tool. This also works with a wide array of different diagnosis programs, like Isuzu IDSS, Allison DOC, Cummins Insite, Wabco, and probably many others that I don't have any experience with.

It's calibrated at the factory. I know it sucks, but I'd remove and return it.

Deletes are so hit and miss. It's really hard to say. If you unplug the EGR , does it set EGR codes? If I'm not mistaken, there's a short section of harness between the VNT and the main harness. Make sure both ends are securely attached.

Cvip? Relay clicking is normal. You're gonna need to get the codes from the ABS module. A generic HD code reader should be able to pull these codes from the round 9-pin connector.

Reset the SCR history. It may be in limp mode for some reason.

What a pain in the butt, but congrats on sorting it out.

U1123 is an error on the proprietary CAN between the turbo's VNT controller, the EGR valve and the ECU.

I know you went through the fuel tank and everything, but also check the inlet fitting on the fuel filter too. Previous debris from the fuel tank gets caught in the banjo bolt. If there's another adapter fitting between the banjo and the filter housing, pull that too and look inside.

P0088 is for high rail pressure, but the troubleshooting is basically the same for low rail pressure.

Pieces may be in the rail. I'd take em all out, take the rail off, wrap it in a clean rag, then blast with compressed air and see if anything comes out.