um, actually, they did exactly what they said. TCM is the Transmission Control Module, which, um , controls the transmission. "Flashing" it (loading new code into it) is exactly a "transmission update"Back into the shop again at a different dealer this time with my 2014 GC Laredo. Told me they did a "transmission update", but the paperwork states "flashed TCM up to date". So they didn't actually do or find anything.