Long story short, I installed a pair of Dynatrac HD 60s in my 14JKU. Coincidently now my jeep is throwing a U0121 and U412. Transmission wont shift nor can I manually shift it. All new wheel sensors installed TWICE. Yes, gears and tires have been calibrated. Keep in mind I had bad wheel sensors with my stock axles and ran/drove just fine before. I find it hard to believe that it`s a bad ABS module. I have 14+ volts while running. Not the battery or alternator. Anyone experience this?

 

Forgive the perhaps moot point but did you use Jeep compatible speed sensors on those new diffs. Failing that did you go back to supplier of the diffs to ask them if this has happened before with others.

 

I have this code on a 2009 Mazda 3. It’s intermittent and throwing the brake symbol on the dash. Strangely I pull the LF seat out and it did the same thing.





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