It's currently an upgrade option for the 231.
FYI:
It does not include the geometery correction brackets ($99.00) or the Procal ($149.00). The Procal is neccessary to correct the steering and change tire size if you are going bigger like we are.
Ours is on order, but it may be a month or so before it's installed at AT. The new Orange Crush JKUR should be here next week, and will be waiting for it. So will a set of 255\80-17's!
On the '12's it re-centers the wheel and resets tire size to keep it out of limp mode. It's 100% required for larger tires on the new JK.
My brother ordered a '12 JKU and will be picking it up this weekend. I am curious as to what you are saying he will need for a lift and bigger tires. I am not up on new Jeeps, my last one was a '97 Cherokee.
No "Steer by Wire" (yet anyway) but what the ProCal does allow you to do is properly zero out the steering angle sensor when doing an alignment. The dealer can do this, but the average alignment shop can not. It involves manually setting the tires "straight" using the alignment rack, then using the ProCal to tell you where exactly zero is on the steering angle sensor. This helps ESP and reduces false ESP events to virtually nothing. Its the "right" way to do it, though for most people setting the steering wheel visually is normally "good enough".
As for tire size, the ESP system compares Yaw Rate, with G-force and known speed and requested yaw via the steering angle sensor to known values. If you don't correct for speed, you're feeding the system bad data and you'll get bad data out. This also effects the transmission.
As far as I know the ProCal is the only programmer out there that also allows you to change gear ratios if you choose to.
Tons of info over on our forum too and in the FAQ's on our site.
dh
2012's are entirely different that 2011's and previous. I don't believe that any device other than the AEV Procal works to change gear setting on 2012's.
I understand automatic transmission shift points on 2011's and prior are affected by both tire size inputs and gear set inputs.
Also, think of this, if the tires size OR the gear set inputs were incorrect the speedometer could not be accurate.