Thanks for the question.
What year and model Chevy do you have?
P0101 = The PCM detects that the actual MAF sensor frequency signal is not within a predetermined range of the calculated MAF value for more than 4 seconds.
Without the use of a scan tool that can read engine data, it will be hard to verify the exact cause of the code, but best bet is that its due to a MAF sensor.
Do you have an aftermarket intake on the truck?