Saw a post on another sight where somebody had the same issue as Dadeoo where it didn't work at all (may possibly be same poster with diff user name??). That issue apparently got resolved finally by replacing a faulty back up camera.
For me, they replaced the module at the end of last year. Got it home and it would not calibrate. Drove it all over my neighborhood and even took it up to a mall parking lot back corner with tons of maneuver space. No luck. Came home and made an appt with dealership to have them look at it again. Left the trailer connected overnight on the curb and next morning took off to turn around and park it on the side of the house and just for kicks hit the TRSC button after driving straight down our street for about 50 feet and got the message it was ready to go. It worked perfect all through 2022 until a trip in September (remembered our trailer, no arrows to calibrate, just a message to drive forward a ways if the truck just started up). Now it is back to getting the calibration message every time the truck is turned off. I do see in the documentation in the online version of the owners manual where it states
"To store a trailer to memory, calibrate the trailer and then allow the vehicle to be off for a period of time. The next time the vehicle is started, place the vehicle in drive and drive a short distance. The trailer system can then be activated".
That statement about allowing the vehicle to be off for a period of time is not in the documentation that the dealership just handed me yesterday or in my printed owners manual. It is in the pdf version of the 2021 RAM owners manual that I downloaded.
Just curious if anybody with the TRSC knows about this and has committed a calibration to their trucks memory by letting it sit connected with engine off for a period of time. It doesn't say how long or if the trailer needs to remain connected with the truck ignition off. Something worked on mine last December, but I can't remember if I left the trailer plugged into the truck... seems crazy that it would take hours.