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engine light, codes p0101 and p0299

5

540s10

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Shrewsbury,MA
on my friends truck 07 classic, he had the fuel filter and transmission lines changed and 20 minutes after getting it back these two codes popped up.

checked the sensors with my scan tool

makes about 3 psi max boost pressure

Turbo vane pos. sensor shows its moving.

can't hear or see any evidence of a boost leak.

any ideas?
 
Code: p0101
Modules: ECM, PCM
Description: Mass Air Flow (MAF) Sensor Performance

Code: p0299
Modules: ECM
Description: Turbocharger Engine Underboost

I would start with checking to make sure the MAF connector is tight and that the wires are not broken.
 
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