Over the past year or so, while actively driving down the road, my 2012 JKU Rubicon will "buck" out of the blue. After connecting my reader and running my "OBD JScan" app, I found that I multiple cylinder misfires on all 6 cylinders. Now don't get me wrong, the # of misfires typically isn't beg...typically 8 or less unless I take a long drive or have to climb any type of hill where there is a load on the engine. The only codes I have, outside of my LED light codes, are C121C - torque requested not possible, torque request signal denied, and C123C - dynamics sensor mounting/installation performance...both under the "Anti-Lock Brakes" heading. I am at a loss and could use any help offered!!!! Thanks in advance!!!!!

 

I have never had this but I think you are correct this is all part of the ABS system. I would start with making sure all the wiring is correct (no frays and the connectors are all tight). Electrical problems are always a pain. I hope it isn't actually the ABS module or the PCM Module. Since you have that odd misfire it may point more to PCM if everything else looks good. There are some vey knowable people on this site. I bet they have more information to help you.

 

Thanks for the reply! I do plan on checking all the abs and wheel speed sensors for sure. Time is my biggest problem right now being a truck driver and only being home a day or two per week/2 weeks....lots to do on those days off, so the more info I can gather beforehand the better off I'll be!!

 

This sounds like one of those issues that require you to have a diagnostic scanner on a laptop connected while you drive and that gives way more info than a code reader. I do that to tune my V8 in the Jeep and works great as it tells you everything. In this case I use HPTuners but that is a $400 touch to buy and get the 2 credits for access. And not including a laptop.