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

 

With all of those electrically related codes it looks like you have a voltage or ground issue somewhere. First thing I would do is pull the battery cables, clean them and the battery terminals, check battery voltage and if it is good then reconnect to see if anything changes. If the battery is low you may need to charge it for a couple of hours before reconnecting.

May also need to check the other end of the battery positive cable where it attaches to the starter to see if that connection is loose or dirty/corroded. Grounds get a little more difficult to check as they are located at various places around the car but one of the first ones to check is where the battery negative cable attaches to the frame. Then check the grounds located in the engine compartment, there are probably 4 or 5 of those. By checking I don't mean looking at I mean putting a wrench on them, loosening, cleaning and tightening properly. Any dirt, corrosion or loose contact will insert resistance into the circuit and lower the available voltage to various components. I don't have access to my factory service manuals right now so can't tell you exactly where those are located.

If you replace the battery and the problem resolves itself the new battery may be covering up the issue since it could raise the available battery voltage to overcome extra resistance in those circuits.

Remember this when diagnosing a problem. Even when there are multiple failure call outs there is most likely only one fault that is generating those multiple call outs. Usually, the only way you get multiple faults is if some outside force damages the circuitry.

Bill

 

My 2014 is having the exact same issues. Ever figure out what it was???

 

Sounds exactly more or less like your issue…OP has posted in almost a year…with his other DTC’s his looks like a power feed issue.