Though I have the following trouble codes disabled in my transmission tune, they pop up anyway. I can clear them with VCM scanner, but they come back each key cycle. They're only visible when scanning TCM codes with a handheld scanner or the like (VCM scanner cannot see them):
U140F implausible engine variant data
U0103 lost communication with gear shift
P0657 actuator supply voltage circuit/open
Unfortunately as long as these codes are present, my manual-swapped NGC3 Magnum (2006 SRT8) is limited to 3,000 RPM. I've tried a zillion different things in the tune, to no avail. Physically disconnecting the TCM also results in a 3,000 RPM rev limit.
I would imagine it's P0657 that's the culprit here. Losing communication with the shifter seems like a poor reason to limp-mode the car, and U140F hasn't always shown up.
I have other things I can try to solve this (resistor on the actuator circuit, Arduino which clears TCM codes each key cycle), but a TCM flash is the cleanest. If HPTuners could solve this problem, it'd enable easy swaps on these cars.
Thanks!