WHY am I not seeing all the codes?

[Papalote]

This is a stand alone with a ECM and TCM LMM Duramax
So I connect the V2 to my DLC pick diagnostics, select read DTCs and it comes up with 4 selections, I cycle through all 4 and all I am getting are codes P0121 and P0140, and I have very low engine power, I have been chasing these codes for several days.

So this morning I have an obvious miss, still no engine codes so I go back to my cheapo Autel and I see MAP, MAF and an open injector code, I do not understand why I do not see these codes on the V2 am I just stupid??