Got my procal today and I set it for my new tires. they meaure 34" even and I set the Module and the horn wouldn't honk. I reset it for 34.25" and it took. went for a test drive and the sway bar light a check engine light where on and also the speedometer stopped working. I ran the DTC code and the check engine light went out. I ran the sway bar code for off and it went out but the speedometer still did not work. I set the restor and every thing returned to normal. I started all over again and same thing. any one have any idea why the speedometer stops working?

 

look here ,lots of info and some that sounds like your problem on around page 15 i think.
hope that helps.

https://www.jk-forum.com/forums/show...ghlight=procal

 

Hey thanks. just what I needed. just did it again and now evey thing is working. with the shift points adjusted its more evedent than ever that I need to regrear.

 

I had no problems with mine at all, wish I could help.

 

right on man,glad i could help

 

Mine did the same thing (no speedo) I just tryed it again and it worked.

 

Every thing working. jeep shifts much less. even back up to 18mpg. I wasn't expecting that. can't wait for the gears.