We have a 2WD 2006 LBZ that we are building into a race truck and are having issues with the transmission shifting when it wants to regardless of how I tune it. It will not do a 2nd gear launch and will shift way too early on other gears. I have setup the tables I can see in EFI Live to the same value accross the board - all modes and all thottle positions, and the WOT tables.
1-2: 0mph, 0RPM
2-3: 63mph, 4800RPM
3-4: 86mph, 4800RPM
4-5: 115mph, 4800RPM
5-6: 318mph, 8000RPM

Yet the truck will shift through the gears like the TCM is not even tuned and be in 6th by 60mph. So I dug deeper and started looking at the PID TSTATE17, which shows you what shift mode you are in; and TSTATE61 which shows you if 4Lo input is active or not. Grounding pin 42 will not show that 4Lo is active like it should. And the only mode that will show yes under TSTATE17 is TSTATE17-SPLIMP "Engine in Default Mode Shift Pattern". On another 2WD LBZ you can toggle between TSTATE17-SPNORM and TSTATE-SPTH saying yes by turning TH on and off. On this truck I tried to remove the pin 54 for the trans fluid temp input and it showed -40* and went to TSTATE17-SPCOLD showing yes, which we also can't see or tune through EFI Live; but I got excited that I may be able to force it into a shift mode that we can tune, so I grounded pin 54 and it showed 320*, but went back to TSTATE-SPLIMP, instead of TSTATE-SPHOT "Hot Mode Pattern". It is not in a normal "limp mode" as far as getting stuck in a certain gear, it shifts perfect and smooth, just not at the set points in the tables that are tunable with EFI Live. There are no TCM codes, and no ECM codes that are turning on the CEL. There are background codes that are disabled like P0103 (MAF is deleted), P0405, etc. - but no active codes. I have made sure that the ECM file the tuning is based on is the correct stock file for the truck, with the correct Speedo and System segments; I have tried 2 different TCMs with 2 different operating systems.

So I need to figure out what can cause it to go into "Engine in Default Mode Shift Pattern" so that I can get it to stop doing so; force it out of that mode and into a mode that can be tuned (Normal, Tow/Haul, 4Lo, or Hot), or get access to the tables for either that mode or cold mode. Out of the 7 shift modes we can program 4 and of course the only 2 I can get this truck to go into are ones we can't tune.