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what is making my transmission slip back into a lower gear after i get up to 45 on 2007 Dodge Ram 1500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
when the transmission changes to higher gear and i'm above 2 rpm it slips back to lower gear and now the malfunction light is on.
(1) Answer
(2) Comments
You need to have the PCM(computer) scanned to retrieve trouble codes. Could be a TPS(throttle position sensor) or other things. Won't know where to start without a trouble code.
The parts house will not be able to retrieve trans codes. You do not necessarily have to take it to the dealer. A qualified independant repair shop can diaginose this problem.
I would seek out a trans shop. You must know someone that has a recommendation for a trans shop.