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Stock JK TechBulletin board forum regarding issues with OE (original equipment) components of the Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) such as factory suspension parts, engine, transmission, body parts, interior fixtures and the on-board computer.
The hill assist holds the brakes for a few seconds on a hill to prevent rollback. I have it on my 6speed and it gives me time to get on the gas before it rolls, I didn't know automatics had it too. You may have another issue.
I don't think mine does because when I normally drive it'll still roll back