I have a 2012 Jeep wrangler sport unlimited and have gotten the code u0121 pop up on the scanner along with going into limp mode. It’s says lost communication with abs. Initially I thought it was just a bad abs module so I replaced the module with a new one and had my local Jeep tech program it to work in my Jeep. The Jeep ran great for a few days and then all of a sudden went back into limp mode and is showing the same code again. There are no other codes showing up on the Jeep and Ive looked everywhere for a poor connection or loose wire and I cannot find anything. Has anyone had this issue before or know how it could be fixed? Thanks guys!
ABS code u0121 and limp mode
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Welcome to the Forum, from Cave Creek AZ.
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