FYI

GMPP LS3 controller 19258272, OS 12638778, Release 6, with black box TCM and 4L60E Trans.

--- ISSUE: When converted to 2 bar OS, the ECM no longer recognizes the 40 pulse VSS signal from a 4L60E trans. I converted it to 2 bar for SD and lower cool fan control temps.

--- If running the OS AS-IS, the ECM recognizes VSS input.

--- Additionally, since the GMPP OS will never turn the cooling fans off at 0 MPH in any case( until 20-30MPH), I recommend using the Dakota Digital Cooling fan controller, which in this instance, uses the coolant temp and VSS input from the DD instrument cluster( NOT using OBD2 as input in this case ).

--- Using VCM EDITOR 4.4.4

Hope this helps anyone else from wasting time on the same issue.

Jim