I figured out the charging thing, my 99 c5 OEM os and tuned file had system selected as gmt530 but everything as far as 1 and 0's in the system options were under vehicle type "Y" for Corvette, this...

Tune from scratch? I just manually moved all my parameters from my stock c5 OS and Tune to the sierra based 12216125 flex os

When I get home I can share my 99 c5 stock on file if you would like. I don't know of any 2002 c5 that cam with os 12216125 that's the problem. I have 2 - p59 PCM's out of express vans and a tune...

Hey guys kept my factory C5 p01 896 PCM as a working backup and installed a p01 0411 with flex fuel os 12216125 from a 5.3L sierra with flex fuel active from factory. I then manually moved all my OEM...

Hey guys, names Kyle, have a 99 pewter C5 Corvette that I tune with HpTuners but and currently learning Universal Patched and it is quickly becoming my go to tuning solution with my vcx nano and my...