Sounds like a dealer thing to diagnose, gets rather involved. Go to the Chilton site

Chilton Repair Manual Access

Link no longer active, scroll down for a working link The Roswell Public Library has made the Chilton Auto Repair Manual available online for free. Not sure if this something new or if it is common knowledge around here: my search didn't turn anything up: so here goes... Follow this link...

www.challengertalk.com

2012 Dodge Challenger> Repair> Search P0741 > Section Title P0741-Torque Converter Clutch Circuit Performance on left

Theory of Operation
The torque converter contains an internal Torque Converter Clutch (TCC) which is controlled by the Transmission Control Module (TCM) to maintain slip (engine speed versus transmission input speed) to optimize fuel economy under specific speed and throttle conditions. For fault determination, the TCM monitors the amount of torque converter slip ONLY when the TCC is in Slip Mode operation. During Slip Mode, the slip speed is expected to be within a predetermined range. If the Torque Converter Clutch (TCC) does not receive adequate hydraulic pressure for any reason, or if the internal clutch is damaged, the TCC will not be able to control to the predetermined slip value. Therefore, if the torque converter slip is more than expected for a predetermined amount of time, the DTC will set.

• When Monitored:
  Ignition on, TCM not in initialization phase, no input speed sensor 1 or 2 (N2–N3) DTCs, no CAN bus or ECM DTCs, no CAN engine speed signal or engine torque signal not implausible DTCs, engine speed greater than 450 rpm, no shift in progress, gear 1, 2, 3, 4 or 5 engaged, and the TCM torque converter status is SLIP
• Set Condition:
  While in Slip Mode operation, the TCM detects TCC slippage greater than a calibrated value.

Possible it's not getting up to temp?

Operate the vehicle until the transmission sump temperature is to greater than 65° C (150° F).

A Guy

 

You might find the info at this site of some value.

Understanding P0741 OBD-II Code: Torque Converter Issues

Learn about P0741 OBD-II code related to torque converter clutch circuit issues. Discover symptoms, diagnostic approaches, and common triggers for this fault.

repairpal.com

But I believe correctly diagnosing just what is wrong and fixing it is probably not something you should attempt.

My advice is to get the car to a qualified tech for a professional diagnosis. You can read the info at the link I provided so you can better understand that the tech might tell you.