C7 Corvette Lost Communication with TCM Code U0101
 

My 2015 C7 corvette stingray with automatic transmission wont shift out of first gear and the gear indicator on screen is blank i scanned for codes and these codes below came up. Any help would be appreciated.

Codes: U0101 Lost Communication with Transmission Control Module.
P184C Transmission Cooling Fan control Circuit.
P26C8 Chassis Control Module Requested MIL Illumination.
P135A Ignition Coil Supply Voltage Circuit Bank 1
P135B Ignition Coil Supply Voltage Circuit Bank 2
P2273 HO2S Signal Stuck Rich Bank 2 Sensor 2
P0420 Catalyst System Low Efficiency
P0449 Evap Vent Solenoid Valve Control Circuit

Hey; do you have a service manual and do you know where the transmission control module is located? I'd start by checking fuses, but what's the history on the car? Any idea on what may have happened to cause the issue to show up?

Hey man i had a diffuser installed and the front bumper and rocker panels painted thats when the problems started. And no idk where the tcm is located.

Ah. Okay, well I do know there are wire harnesses up front that plausibly have those signals. I'm hunting factory service manuals, myself, so I'll let you know if I find anything if you'd like. I think I'd start by trying to locate the tcm and associated wiring. Fuses are always a good place to start checking, but I wouldn't be surprised if someone forgot to plug a harness back in.

vetteguy2019: welcome to the forum.

Here's a link to Helm which is the official publisher of GM Service Manual. I would look in the areas that the recent work was done since that's when the problem started. They aren't cheap anymore. There used to be and maybe still is an order form in the back of the owner's manual to order the manual.

I am new to the forum and was wondering if you found the cause of this issue. Was thinking a loose ground or connector up front as the cause.
Thanks

Welcome to the forum.