Originally Posted by jgc4ever
Thank you. My 2012 WK2 with V8 has the symptoms this TSB sounds like it will fix. It never seems to know that I'm giving it gas when I need to accelerate. Today, down an on-ramp to the interstate I was going about 25 and it was making a droning noise and not accelerating like it needed it to, which is usual, and I usually down shift. Today I decided to just really give it some gas, and it did go but it took the rpms to 5500. It's like all or nothing. I'm going to have to get this TSB done. I just hope it doesn't cause any new problems. My biggest fear is the dreaded shudder or fish-bite which I don't have either of, but I would hope a TSB to fix things wouldn't cause any new problems, so probably safe to get it done. Good to hear results from those that have done it.
Thanks Lee / JeepCares
I had all of those problems and they were resolved by the TSB.
No shudder or fishbite (my vehicle has never exhibited that behavior)
It's like driving a different Jeep now.
The transmission is now competent and allows that wonderful Hemi "Eagle" engine to shine.
I drove 80 miles yesterday, traversing all the roads that previous to the TSB gave me fits due to the inconsistent and lazy shifting when slowing for lights or making turns.
The Jeep finally knows what gear to be in and the acceleration is just as it should be. No more feeling like I am in 5th gear when I should be in 2nd. It's almost like being in sport mode, but I am not.
Converter lockup is a lot more consistent too. The Jeep always felt great on the freeway, but on regular streets the shifting felt confused and lethargic.
No more. When I am slowing for a light that is red that suddenly turns green and I push the gas, the vehicle actually accelerates in the proper gear and doesn't sit there loafing waiting to downshift.
The upshifts are a lot more consistent and timed properly too.
Whoever wrote this firmware for the shift programming over there really deserves a raise/bonus. This is definitely the way this vehicle should have been delivered.
The TSB is a valentine from Jeep for owners of this model year. It completely resolves all the power train issues I had with the V8 and auto trans equipped in this WK2. I'm very impressed that they still support previous model years with these VERY useful software updates.
Definltely go get this update if you haven't already. You will be amazed at the drivability differences with your Grand Cherokee after it's applied.
It's definitely a different driving experience for me now. I am very pleased.