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Did you download and install the software first? Have to install the software and once completed plug in the device to your computer, launch software and click update. Just went through this on mine the other day.
Link to download the software
https://www.roughcountry.com/speedcal-update
I haven't seen anything about a lift causing the traction control warning light to come one. I have seen reports around the web of it coming on if placing larger tires and not recalibrating the speedo it could happen. I put a 3.5" lift on my 2020 1500 Big Horn Friday along with 35's and haven't...
3.5" lift, rims and tires installed on Friday. Details were posted in the Suspension forum, but here they are as per @PorBoy request.
Rough Country 3.5" bolt on lift kit.
Moto Metal M0978 20x10 -24
Aturro Trailblade XT 35.12.50
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