The two tranny codes 34 35 are due to the speed sensors not sensing the known values for any certain RPM. They know what the rpm in the front of the trans. through any certain gear (in this case 4 and 5) should be at the rear of the transmission. Seems likely that it's the speed sensors on the tranny or the ESM itself causing the issue. If not it would be mechanical and likely need a rebuild. It seems according to many sources and my mechanic friend that the sensors on this transmission are known to be a failure point and they are what gives the shifting module all it's information. You can see the sensors if you lay under the commander on the drivers side and look up at the transmission. They have two wires going into a round plastic connection into the transmission. Jeep has them for about 60ish.
Those are pretty much my same issues as well and I'm fairly sure it's either the sensors of slipping inside the tranny requiring a rebuild.
Thanks for the info guys, sounds like I am probably on the right track with my thinking on this.
I really appreciate your detailed insight. Sounds like from what you have told me, that those codes are pointing right to the speed sensors.
I am dropping it off at the Jeep dealer Friday, and I am wanting to be as familar, or informed as I can be with this issue.
With it being out of warranty now, I am really trying to avoid a wrong diognosis leading to some pretty costly repairs that were not needed.
The dealer seemed to agree as well, that it sounded more like an electronic issue, like you mentioned a speed sensor or something along those lines. I am not familar with where all the sensors are located or exaclty which ones effect what, but I am just not sensing any slipage of the trany, just maily odd shifting patterns, and some rough shifts. I rememberd seeing some post that was reffering to a bad injectors, or bad ignition coils that were causing trans problems too. So be it a sensor, or engine issue, none of which would benafit from a trans rebuild if . With that lean code too, it has me wondering if that might not be relative to the trans issue somehow?
I am always afraid when these things are out of warranty, that I am going to get some mechanic that just wants to throw parts at it, till they get lucky and actually fix it. When its under waranty and on someone elses dime, its not that big a deal. LOL But with 80K on the clock and out of warranty it's can be a really big deal to me.
I am also planning to sell this vehichle soon, so spending a ton of money on it at this stage, is just not really something I am wanting to do.