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2015 Tranny TSB 21-019-17 Dated 4/22/17

12K views 29 replies 13 participants last post by  shsabres 
#1 ·
Heads up on a new TSB 21-019-17 dated 4/22/17 for NAFTA, APAC and EMEA markets for 2015 2.4L & 3.2L to flash the TCM for "Transmission Diagnostic and Shift Enhancements".
http://www.wk2jeeps.com/Misc/Cherokee/KL_TSB/KL_21_019_17.pdf

"THIS SERVICE BULLETIN IS ALSO BEING RELEASED AS RAPID RESPONSE TRANSMITTAL (RRT) 14-094."
 
#2 ·
Thanks for the heads up. I'm not planning on any dealer visits/oil changes for awhile. We'll see how this one shapes out.
 
#12 ·
Did anyone else have this TSB performed? How has it affected your shift quality?
 
#13 ·
Just got mine done today after having its first flash ever done in February or March. Just drove a little so wasn't able to do a good compare but it seemed a little smoother. Seemed like it was holding low gears just a tad longer than before which made up-shifts better. Still dropping 3 to 2 on deceleration about 5-6 MPH and 2 to 1 at almost dead stop. Didn't notice some of the bumping I was getting on 2 to 1 when coming to a stop, but again, only drove maybe 10 miles.

Still don't know why the reduced the 2 to 1 down-shift on deceleration. Used to happen at 2MPH and I never had any issue with that. Now it only hits 1 on almost complete stop. Dumb that they did that.
 
#17 ·
It would be nice if Jeep could finally fix this issue! Ive had all of the TSB's performed as they've come out, but I still have the downshift issue! I have to time crossing roadways so that the car isnt in 3rd gear when I cross - otherwise by the time the rpm's pick up, I'll be caught dead slow in the middle of the lane!
 
#18 ·
Did you have the TSB in the thread title performed?
 
#24 ·
Just to clarify...does it downshift from 3-2-1 now?... or.... smooth the direct shift from 3-1? Thanks.
 
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#27 ·
Really doubt any TSB will restore the 3-2-1 in transmissions with the snap ring problem that were involved in the R01 recall.

Mine allegedly has the bad snap ring and I did receive and had applied the R01 recall which hamstrung the 3-2-1 graceful downshift. Have noticed lately it will downshift from 3-2 when attempting to accelerate from a speed of 1 mph to ~7 mph, however there is still a slight lag followed by a surge that is annoying. It would be better if the downshift occurred immediately when the system detects any throttle pressure. Can only hope a future TSB will speed up the downshift response on acceleration in the 1-7 mph range.
 
#28 ·
Really doubt any TSB will restore the 3-2-1 in transmissions with the snap ring problem that were involved in the R01 recall.
I have R01, and did not lost the 3-2-1 downshift. The R01 I had was Rev C, I waited because I heard about the issue with loosing the 3-2-1downshift until I heard that Rev C had restored it. I had no problem after the R01 Rev. C, and then I had the S55, and now I am experiencing the hard 3-2 downshift!
 
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