Driving around town possibly waisting fuel and time if the first one or 2 don’t have the tool to read TCM, or just drive to the place that has the scanner that reads TCM.
I don’t think a basic scanner can read TCM, basic OBD2 scanners are what most auto part have, where I live.
Where most shops have the ability to read everything having the proper software, but this comes at a cost, not free.
Allison might wave the fee, if they end up doing the repair.
Something to consider checking out.
2007.5 GMC "Black" Sierra SLT 3500HD SRW C.C. 4X4 LMM Z71
DIY stock airbox mod, aFe ProGuard 7, OEM drop-in
EFILive ECM ATP - Heavy Tow Tune with Turbo Brake
EFILive TCM Duramax Tuner
DHD Cold Side High Flow Intake Pipe
DHD PCV Re-route
2007 GMC Yukon Denali "BLACK" 6.2 gasser, DIY stock airbox mod, K & N OEM drop-in, Airaid intake tube, EFILive TCM tuned
Last edited by D_R_C; 04-30-2019 at 11:24 AM.