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  #1  
Old 11-22-2015, 09:33 AM
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Another 9-speed transmission thread.......

My 2014 Jeep Cherokee Trailhawk, V6 (20,000 miles) has been an excellent vehicle (IMHO) except for the shifting decisions of the ZF transmission. When slowing for an inside rolling right turn, it would downshift to 3rd, and not 2nd...giving an anemic acceleration away from the corner. Also, getting more acceleration when in 7th or 8th required a good bit of go-pedal depression or a manual downshift to get to a lower gear. BTW, the transmission shifting related TSBs had done but provided no improvement in the shift problem.

When the Jeep went in for a oil change last week, I spoke with the service guy who took good note of my shifting complaint. With only 100+ miles since "the fix", its shifting much better so hopefully the problem is solved. They did nine (yes, 9!!!) module software updates:

The service report stated: "The failed component is the software updates" and then listed the modules that were updated: DTCM, RDM, PTU, TCM, ACC, BCM, IPC, PAM, and RFH.

Perhaps there's hope that the shifting plague is being resolved.

Desert Hiker

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  #2  
Old 11-22-2015, 10:22 AM
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Re: Another 9-speed transmission thread.......

Quote:
Originally Posted by Desert Hiker View Post
My 2014 Jeep Cherokee Trailhawk, V6 (20,000 miles) has been an excellent vehicle (IMHO) except for the shifting decisions of the ZF transmission. When slowing for an inside rolling right turn, it would downshift to 3rd, and not 2nd...giving an anemic acceleration away from the corner. Also, getting more acceleration when in 7th or 8th required a good bit of go-pedal depression or a manual downshift to get to a lower gear. BTW, the transmission shifting related TSBs had done but provided no improvement in the shift problem.

When the Jeep went in for a oil change last week, I spoke with the service guy who took good note of my shifting complaint. With only 100+ miles since "the fix", its shifting much better so hopefully the problem is solved. They did nine (yes, 9!!!) module software updates:

The service report stated: "The failed component is the software updates" and then listed the modules that were updated: DTCM, RDM, PTU, TCM, ACC, BCM, IPC, PAM, and RFH.

Perhaps there's hope that the shifting plague is being resolved.

Desert Hiker
The 2014 trail hawk i had was great UNTIL i got the tranny flash. After the flas it would never down shift past 3rd unless you came to a complete stop and then you had to wait 4 second for it to get into 1st or it would take off in 3rd if you only waited 2 seconds and if you waited 3 seconds it would start off in 2nd. The dealer did the reflash again and no help so then chrysler wanted to put in a new valve body and i said thats it im going lemon law and the dealer said go out there and drive a 2015 and see if its ok. Well it was way diff and it was a limited 2 wh drive as i really dont need a 4x4 and the trail hawk was 519 lbs heavier than the loaded limited. SO FAR EVERY THING AS BEEN GREAT ON THE 2015 and i told the dealer DO NOT do any flashes or recalls on my jeep without calling me 1st. By the way in the 1/8 mile the 15 is .35 and 3.5 mph faster than the 14 was and the 0/60 is .4.3 faster at the same altitude of 2552 & 2569 ft. The 15 2 wh also has a better ride than the trail hawk.
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  #3  
Old 11-22-2015, 02:48 PM
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Re: Another 9-speed transmission thread.......

You know the thing I find odd about the whole 9 speed transmission issue? I have a very early build that was delivered on 11/13/13 Jeep Cherokee Limited 3.2L ADII and never have had any of the flashes, TSBs, or recalls done to it and yet it shifts perfectly. Were the very early ones that much better or were the ADII ones better? And I have the same thing on my dealer account. No flashes without my permission.
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Old 11-23-2015, 09:31 AM
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Re: Another 9-speed transmission thread.......

Quote:
Originally Posted by macfan View Post
You know the thing I find odd about the whole 9 speed transmission issue? I have a very early build that was delivered on 11/13/13 Jeep Cherokee Limited 3.2L ADII and never have had any of the flashes, TSBs, or recalls done to it and yet it shifts perfectly. Were the very early ones that much better or were the ADII ones better? And I have the same thing on my dealer account. No flashes without my permission.
Mine is a January 2014 build, and it had the problems noted above when delivered....thus I authorized the TSBs in the hopes of improving the shifting.

The very early builds in 2013 were held before the Cherokee/KL launch in order to finalize the transmission and other related software. Could it be that those had a more comprehensive and successful flash of modules than the field applied TSB?

Desert Hiker
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  #5  
Old 12-08-2015, 08:32 AM
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Re: Another 9-speed transmission thread.......

It's been 3 weeks and perhaps 1200 miles since the 9 module tranny related reflash (see post #1), so the adaptive learning should be stabilized. The result is MUCH improved, to the point where the 9 speed shifting is no longer a PITA. My Jeep Cherokee Trailhawk is back to exceeding my expectations when I decided to buy it.

If you're still frustrated with your 9-speed shifting, consider the full set reflash as described in Post #1 in this thread.

Desert Hiker
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Old 12-08-2015, 01:40 PM
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Re: Another 9-speed transmission thread.......

Hi - Have you not been getting the updates? It looks like you had a back log...mine is supposedly up to date yet your symptoms are EXACTLY what I still have!!

Appreciate your comments - since I might have the dealer update the same 9 on mine.
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Old 12-09-2015, 09:14 AM
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Re: Another 9-speed transmission thread.......

Quote:
Originally Posted by guitar54 View Post
Hi - Have you not been getting the updates? It looks like you had a back log...mine is supposedly up to date yet your symptoms are EXACTLY what I still have!!

Appreciate your comments - since I might have the dealer update the same 9 on mine.
All prior TSBs were previously applied. So I again complained about both the shifting problems and a clunk in the front suspension when off-roading and a front wheel articulated/extended. The repair order said: "The failed component is the software updates. {emphasis added} The 9 modules listed above were reflashed. The service guy said one of the flashes related to the front end PTO so the front clunking was resolved by the reflash. The service report said they also fully inspected the front end to assure the suspension was OK - nothing found. I've not yet tested for resolution of the clunking problem.

I hope this helps.

Desert Hiker
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Old 12-28-2015, 07:33 PM
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Re: Another 9-speed transmission thread.......

Mine was a early TH delivered in early November 2013. It was fantastic in every way. Every time the dealer touched/updated it things went south. The shift patters are absolutely garbage at this point. Today I called and requested full replacement of the transmission. To my surprise they did not hesitate. I'm taking it in Wednesday to officially start the process/complaint so they can order the replacement.
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  #9  
Old 12-29-2015, 10:39 AM
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Re: Another 9-speed transmission thread.......

Quote:
Originally Posted by Q Tech View Post
Mine was a early TH delivered in early November 2013. It was fantastic in every way. Every time the dealer touched/updated it things went south. The shift patters are absolutely garbage at this point. Today I called and requested full replacement of the transmission. To my surprise they did not hesitate. I'm taking it in Wednesday to officially start the process/complaint so they can order the replacement.
The more info comes about about the 9-speed, the more it seems like a technology that wasn't ready for prime time. Stuff happens with high tech is released from the controlled development environment into the wild. The manufacturing, shift-programming, adaptive learning, and TSB/update process for the software is so complicated that OEM and service dealers were unprepared/untrained to deal with it. I got lucky that my dealer squared it away after the TSB wreck.

Desert Hiker
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  #10  
Old 12-29-2015, 11:15 AM
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Re: Another 9-speed transmission thread.......

Quote:
Originally Posted by Desert Hiker View Post
The more info comes about about the 9-speed, the more it seems like a technology that wasn't ready for prime time. Stuff happens with high tech is released from the controlled development environment into the wild. The manufacturing, shift-programming, adaptive learning, and TSB/update process for the software is so complicated that OEM and service dealers were unprepared/untrained to deal with it. I got lucky that my dealer squared it away after the TSB wreck.

Desert Hiker
its not the zf transmission hardware as the issue as it is the software, that transmission goes on different platforms and manufacturers and is working ok on others. Its more the customers(FCA) adaptation of it to their platform. From what I have read ZF engineers the transmission but the shift strategy programing is up to the automakers. FCA seems to be a dim bulb in that area and why you still have 9spd and 8sp(845RE) shift issues 3 years later and why land rover can have the same zf 9spd and fewer issues with it on their platforms.
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Old 12-29-2015, 07:22 PM
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Re: Another 9-speed transmission thread.......

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Originally Posted by silvermax04 View Post
its not the zf transmission hardware as the issue as it is the software....
Agree with much of what you said, but the biggest problem was in fact a hardware problem: namely the C-Clutch snap ring. It's unclear whether that was a ZF error or something FCA screwed up at the Kokomo Transmission Plant, or wherever. The dimness of the bulb is most apparent in the software changes flashed to pussyfoot around the hardware problem.
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  #12  
Old 12-30-2015, 06:52 AM
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Re: Another 9-speed transmission thread.......

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Originally Posted by Array View Post
Agree with much of what you said, but the biggest problem was in fact a hardware problem: namely the C-Clutch snap ring. It's unclear whether that was a ZF error or something FCA screwed up at the Kokomo Transmission Plant, or wherever. The dimness of the bulb is most apparent in the software changes flashed to pussyfoot around the hardware problem.
So far since i got a great deal on a 15 from the dealer the trannys been fine and i wished i never flashed my 14 lol. Because i really dont need a 4x4 and i really like the limited better than the TH because it was 519 lbs lighter and has a better ride. The 14 TH performance and MPG really is hurt because of the xtra wt it carries over the limited.
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