I just finished installing 4.56 gears and true tracs front and rear. I also broke a wheel speed sensor and replaced it. I took it for a test drive and I had traction control light come on and the jeep will not shift passed 2nd gear, and I think its in some kind of limp mode. I read the codes and had P0731 (Gear one incorrect ratio). So far I have reset codes, changed gear ratio and tire size in the system using alfaOBD. I also had installed an adjustable track bar that caused the steering wheel to be off so I straightened the steering and the traction control light went off but transmission still is not shifting. Anyone have any ideas? Thanks
2014 JK transmission issue after regear and LSD install
- Thread starter Scott86MJ
- Start date
Chris_Keziah
Joe Dirt @ Rev Limit Fab
- Joined
- Dec 1, 2010
- Location
- Winston-Salem
That code happens when it's not flashed with the proper tire size and gear ratio. Try resetting them again.
- Joined
- Mar 20, 2005
- Location
- Hendersonville, NC
Sometimes the reflash takes a couple of attempts.
I've run into that a few times but never with a ProCal or a Super Chips tuner
I've run into that a few times but never with a ProCal or a Super Chips tuner
Last edited:
I will try again to reflash with the alfaOBD. The p0731 code is permanent and I'm not sure how to clear it. I will order the Procal or Super chips tomorrow if i cant resolve it today. Do you have a preference, they are about the same price. Thanks
- Joined
- Mar 24, 2005
- Location
- Stanley, NC
AlfaOBD should be "better" than the Superchips or Procal option since it's within the OEM software. Have you tried pulling the ground cable long enough for everything to reset? I assume that won't fix it, but its worth a shot and doesn't cost anything.
I believe I have fixed it but I'm not sure what I did to fix it. I left the ground cable off over night but code was still there when I reconnected it today. I put the jeep in 4lo in my driveway and the ESPoff indicator came on and when I returned it to 2WD the CEL is out and the transmission shifts again.
Croatan_Kid
How's your hammer hangin'?
- Joined
- Nov 4, 2007
- Location
- New Bern
Sometimes the Lord works in mysterious ways 
- Joined
- Mar 24, 2005
- Location
- Stanley, NC
On the plus side now I know someone local who has AlfaOBD so I can tweak a few things on my truck
Anytime, just let me know. I enabled backup camera and added the factory brake controller and it worked great.On the plus side now I know someone local who has AlfaOBD so I can tweak a few things on my truck
Croatan_Kid
How's your hammer hangin'?
- Joined
- Nov 4, 2007
- Location
- New Bern
On the plus side now I know someone local who has AlfaOBD so I can tweak a few things on my truck
It's not always all about YOU....except for now, because I'd do the same thing.
Welp I spoke to soon, the P0731 code came back so I ordered the Superchips flashcal. This is my wifes Jeep and I've had it in my shop for over 2 weeks so hopefully it works great once I use the Superchips programmer.