Cm871 codes 2961 2764 4214

[in2trux]

(03-30-2016 )JetHauling Wrote:  Hi guys, I recently purchased PETE 388 with a 500 in it. I'm having problems where the truck will limit the turbo to 20psi. Before the turbo limits and the truck is running proper the check engine light will flash for a few seconds and go away, with the occasional quick and short turbo "burp"After the turbo derates they won't come on again.. Using the Cummins software I was able to pull this codes. Sometimes it will do this for an hour, sometimes for the entire day and carry over until the next morning.. I've replaced the sensor on the intake because it was all blocked up with soot.my outside air temp gauge is traded way below what it should be, I'll be changing that this weekend as well.
thanks for your help

You need to replace the exhaust gas pressure sensor for sure and check that the tube feeding it is clear.
If the IMAP was blocked that bad, so is the Delta P, the one with two tubes on the intake manifold, that will cause the "burp" as you call it. I call it a snort or cough.
To clear the 4214 code you need to do a DOC maintenance reset with insite.
Also need to compare ambient air temp and barometric pressure readings are accurate.
Do you have insite?