I am also now in the middle of tracking down this darn P0106 gremlin. I've got a few additional issues however. First, truck info: 2008 4x4 fully deleted 5" TBE, CAI, CCV filter deleted, H&S XRT Pro wild tune with transmission tune, Edge Juice still installed but set to stock, Edge CTS monitor, fully deleted at 30K and now at 99K. No problems to speak of since deleting.
So about a month ago I towed a 10,000 load up to Northern AZ with several long steep climbs. On the first big climb I was holding steady at 65mph with no issues when the truck just fell on its face. The MIL and CEL came on and I pulled over. After shutting down and restarting, I was back on my way. I was fine the rest of the trip.
When I got home I searched and found several threads about this P0106 issue and did the following: Cleaned the MAP, MAF and IAT sensors and harnesses with MAF electronic cleaner, cleaned air filter, checked fuses and checked for leaks. No further issues over the next couple weeks daily driving it (No towing).
Fast forward to this most recent weekend and I was headed North again with the same load. This time however it tripped 4 times over the course of 60 miles on the way up. I stopped, shut down and restarted each time. On the way back down the mountain however is where I experienced something weird. I had the EB engaged when it all of a sudden changed both the way it normally sounds and the braking force. It sounded like it was barely engaging, but definitely was engaging. I tried downshifting, playing with the button and everything in between. At one point it came one normally for about 3 seconds and then got quiet and produced very minimal braking power, but I could still faintly hear it whistling. Once I made it down the mountain and on fairly flat roads it seemed to begin working again. Also, my CTS reads the following "Manifold Absolute Pressure Sensor Performance +B4687". Does the B4687 mean anything? I can't find info on it?
So, what i've found is that both the P0106 and Exhaust Brake issues happened while towing. When daily driving I have no issues. In fact, on the way to work this morning the EB worked normally with no issues.
Based on all the threads I've read, I am gretting ready to purchase a new turbo speed sensor, especially since I've noticed an EB issue. Am I headed in the right direction?
One other piece of info; While cleaning my MAF sensor I noticed that it did not have the two wire resistor like every other MAF sensor I've seen. I tried searching for it and found half the pictures I've seen show the resistor, and half do not?? If that little resistor came off, it might explain the EB issue since it would have been sucked into the compressor and gone through the motor
Anyway, here is the picture I took of my MAF.