2013 RAM 1500 - Gain gone

gain light on do not have the buttons 2013 ram 1500 changed the transmission fluid then the gain was on my screen never was before

Harley , edit your post as it makes no sense at all . And do you actually have a question ?

Never encountered a “gain light”. Is the detergent tank empty. Add more detergent. Does it have to be Gain? Does the fragrance matter?
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“GAIN” is the trailer brake adjustment, if you do not have a trailer brake controller, something must be corrupt in the EVIC.