TMC as in TRAFFIC MESSAGE CHANNEL (European vehicles) or TMC as in TCM-Transmission control module.
If its the 1st, your antenna is probably resisted.
If its the 2nd, need FAR FAR more info and this is definitely a job for professionals. If its in limp mode, a warning lamp is also on or will be. That means fault code(s) set and there will be freeze frame, failure record, and code ID info a tech must have to proceed. If you replaced the Trans Control module...it must be programmed correctly for the vehicle...and more importantly, who said to and why did you? If someone diagnosed it, thats fine, they should warranty it. But it really will require significant tooliing (Above average enhanced scantool and a meter or scope, possibly some pressure measurement equipment) that you just dont have and cant buy at the local hardware store or parts house..
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