Posting problem for a friend, he has a 2004 2500 the other day he was on the highway and the CEL came on and he had a huge loss of power, he got off and turned around to limp it back home, it was about 6 exits, he said at one point couldn't get over 50mph.
He got home and I went over to scan the codes came up with p0237 and p0299

P0237 Turbocharger Boost Sensor A Circuit Low
P0299 Turbocharger/Supercharger "A" Underboost Condition

And I did a little research and found that these could be caused by the MAP sensor, checked it and saw it was really dirty but instead of cleaning it and putting it back in, just ordered a new sensor, put it in today went for a test drive still no power.

 

Did you clear the codes? Does he have a boost fooler? Stock turbo? Pull the intake off and check the turbo!

 

I cleared the codes but p0299 comes right back

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He doesn't know the answers to the rest. Bought the truck the way it is

 

Tried clearing them again, this time they went away and trucks running great.