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Old 11-18-2014, 06:50 AM
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V6 Transmission Shifting MUCH Better after Reflashes

I'm happy to report (as I'm sure many of you are as well) that my 2014 V6 Overland is shifting MUCH better since taking it to the dealership yesterday to perform TSB 21-030-REV. A. So far, the rough downshifts from 2nd to 1st gear while crawling in traffic are just about gone, and best of all, it looks like I've finally found a decent Jeep dealership near me!

There were (3) reflashes total performed:

1) RRT14-087 - Reprogram ATC and Calibrate Actuators

2) 08-P64 RECALL - Reprogram TCM, Perform Quick Learn

3) RRT14-050 - Reprogram BCM

In addition, I had told the dealership that I was getting steering wheel vibration at highway speeds...especially over 70 mph. All four wheels were rotated & balanced, and this morning on the highway, things seemed much smoother. I did have to pay out of pocket for a rental for the day ($35 for a 2014 Jeep Patriot), but Chrysler Customer Care said they would reimburse me. As an added bonus...coming out to my Jeep after a cold remote start, I noticed the rear defroster/heated mirrors WERE ON! I haven't seen this feature since v13.19 on my old 2014 V6 Limited. I hope this feature stays on my current Overland!

So all in all...things worked out well. My Overland is running much better, I seemed to have found a good Jeep dealership near me, AND rear defrost/heated mirrors comes on automatically after a cold remote start.

I like my Jeep again! Fingers crossed things stay good...


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Old 11-18-2014, 07:39 AM
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Re: V6 Transmission Shifting MUCH Better after Reflashes

That's good to hear!!
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Old 11-18-2014, 07:34 PM
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Re: V6 Transmission Shifting MUCH Better after Reflashes

Congrats GCL... that's been a long time coming for you.

I had the harsh 2-3 upshifts and 2-1 downshifts. The adaptive relearn immediately eliminated the harsh 2-3 upshifts. The harsh 2-1 downshifts remained. After driving the GC for approximately 300 miles, one day I noticed that I had smooth 2-1 downshifts. They just disappeared. I have maybe 1000-1100 miles on it since the relearn and the trans is still shifting beautifully. LOL... I hope that's here to stay.
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Old 11-18-2014, 08:26 PM
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Re: V6 Transmission Shifting MUCH Better after Reflashes

That's good to hear....but what bothers me is that you're saying the rough shifts are "just about" gone. If they aren't completely gone, I'd be more than skeptical that the issues aren't truly fixed and that the shift quality will degrade over time. I'm not trying to jinx you or anything, but why can't they get the damn transmissions on the "problem" vehicles fixed right permanently?
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Old 11-19-2014, 06:21 AM
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Re: V6 Transmission Shifting MUCH Better after Reflashes

Quote:
Originally Posted by MSCA View Post

That's good to hear....but what bothers me is that you're saying the rough shifts are "just about" gone. If they aren't completely gone, I'd be more than skeptical that the issues aren't truly fixed and that the shift quality will degrade over time. I'm not trying to jinx you or anything, but why can't they get the damn transmissions on the "problem" vehicles fixed right permanently?
True...my rough shifts from 2nd to 1st gear coming to a full stop while crawling in heavy traffic aren't completely gone, but they are greatly diminished and happen WAY less frequently. Like MDBones stated, I'm hoping things get even better as I put on some mileage.

I'm SO happy my rear defroster/heated mirrors come on automatically now after a cold remote start!

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Old 11-19-2014, 07:06 AM
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I noticed the rear defroster coming on with remote start yesterday also maybe it was part of that BCM update because i know it wasnt doing that last winter.
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Old 11-20-2014, 08:16 AM
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Re: V6 Transmission Shifting MUCH Better after Reflashes

Quote:
Originally Posted by GCLimited View Post
True...my rough shifts from 2nd to 1st gear coming to a full stop while crawling in heavy traffic aren't completely gone, but they are greatly diminished and happen WAY less frequently. Like MDBones stated, I'm hoping things get even better as I put on some mileage.

I'm SO happy my rear defroster/heated mirrors come on automatically now after a cold remote start!


It likely will get better as you continue to drive it. When they did the new "quick learn" that just set up a base clutch calibration for the transmission. The adaptives will pick up from there and as they update it will continue to improve. You might want to look at the "learning" procedure in the TSBs if you want to help it along faster.

I had a 2014 Hemi GC with the 8HP70 -- now a 2015 Hemi--same transmission. They've made a huge change even with those (and they were never as problematic as the 845RFE behind the V6). They've updated the shift points to hold gears a bit longer and softened the TCC apply and holding algorithm (likely a decision to give a little on the CAFE figures in exchange for a smaller number of complaints).

One of the reasons the 8HP70 hasn't been quite as problematic is that Chrysler had a bit more time and use with it to work out the programming. Modern transmission programming is exceedingly complex -- more so as the number of gears increases. If you look around the internet you'll see various complaints about shift quality in every manufacturer when a new transmission is introduced.

Now if you want experience true transmission hell -- some of the Cherokee 9-speeds, especially behind the 2.4L engine were GHASTLY. They finally have that mostly worked out now too but after driving an early one I can honestly say it was horrendous. The updated software for those is worlds different as well.
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Old 11-22-2014, 06:32 PM
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Re: V6 Transmission Shifting MUCH Better after Reflashes

Quote:
Originally Posted by Peter_K View Post
It likely will get better as you continue to drive it. When they did the new "quick learn" that just set up a base clutch calibration for the transmission. The adaptives will pick up from there and as they update it will continue to improve. You might want to look at the "learning" procedure in the TSBs if you want to help it along faster.

I had a 2014 Hemi GC with the 8HP70 -- now a 2015 Hemi--same transmission. They've made a huge change even with those (and they were never as problematic as the 845RFE behind the V6). They've updated the shift points to hold gears a bit longer and softened the TCC apply and holding algorithm (likely a decision to give a little on the CAFE figures in exchange for a smaller number of complaints).

One of the reasons the 8HP70 hasn't been quite as problematic is that Chrysler had a bit more time and use with it to work out the programming. Modern transmission programming is exceedingly complex -- more so as the number of gears increases. If you look around the internet you'll see various complaints about shift quality in every manufacturer when a new transmission is introduced.

Now if you want experience true transmission hell -- some of the Cherokee 9-speeds, especially behind the 2.4L engine were GHASTLY. They finally have that mostly worked out now too but after driving an early one I can honestly say it was horrendous. The updated software for those is worlds different as well.
I have often wondered if the Dodge Durango (Citadel) has had these problems with their V-6 Auto drivetrain, not had the time to research it though?! Dave
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Old 11-23-2014, 08:10 AM
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Re: V6 Transmission Shifting MUCH Better after Reflashes

Quote:
Originally Posted by Peter_K View Post

It likely will get better as you continue to drive it. When they did the new "quick learn" that just set up a base clutch calibration for the transmission. The adaptives will pick up from there and as they update it will continue to improve. You might want to look at the "learning" procedure in the TSBs if you want to help it along faster.
Thanks for the tip and info Peter.

I found this note most interesting in transmission TSB 21-030-REV.A...

NOTE: 2015 model year vehicles equipped with the 845RE already contain software in the TCM to enable the Quick Learn procedure. However, 2014 model year vehicles require the TCM to be updated to the latest software level.

This statement infers ALL 2014 V6 Grand Cherokees need a reflash when it comes to this "Quick Learn Procedure".
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Old 11-23-2014, 01:49 PM
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V6 Transmission Shifting MUCH Better after Reflashes

Quote:
Originally Posted by GCLimited View Post
Thanks for the tip and info Peter.

I found this note most interesting in transmission TSB 21-030-REV.A...

NOTE: 2015 model year vehicles equipped with the 845RE already contain software in the TCM to enable the Quick Learn procedure. However, 2014 model year vehicles require the TCM to be updated to the latest software level.

This statement infers ALL 2014 V6 Grand Cherokees need a reflash when it comes to this "Quick Learn Procedure".

Vehicles being built typically have newer software before it's released as a reflash to existing vehicles. This is largely because of procedural issues -- releasing the software separately, testing the reflash process to ensure it can be done properly by dealerships as opposed to the factory, etc.
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