If you're outside warranty, you can order all the Kwikee step parts on Amazon and get them really fast. Sounds like it's likely the control module. I know it sounds crazy, but try giving the motor a pretty good rap with a hammer. That often makes it start working for a while, believe it or not.
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2015 Legacy SR340 360RB with 2014 Wrangler Unlimited Toad
Gigi, Poppy and Sadie the Jack Russell (all 14 lbs of her)
2015 Legacy SR340 360RB
2014 Jeep Wrangler Unlimited Toad
Gigi, Poppy and Sadie Lady...On the road, but not full time!