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you've got the early 04. almost certainly has the inferred ebp pcm reflash. the p006a code is often a result of this reflash. with the egr blocked, it probably set the code, since egr also doubles as the turbo wastegate, to an extent. the reflash omits the actual ebp reading and instead, calculates the reading through map and maf. to achieve this, the map sensor readings are now hyper-sensitive. so the map/maf correlation code gets thrown out much more often with the reflash.
i would look for any exhaust leaks. especially around the manifolds, turbo up pipe bellows, and turbo flange. look for soot around the firewall. that is the most common cause of this code on late trucks (late 04 and up), that don't run inf. ebp.
or, if you have an aftermarket air cleaner unit, that can sometimes trip the code as well.
basically, if you don't have any exhaust leaks, i wouldn't worry about this code
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