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Discussion Starter · #1 · (Edited)
TSB NUMBER: 21-026-14
GROUP: Transmission and Transfer Case
DATE: August 27, 2014
SUBJECT: Flash: Transmission Shift Enhancements
OVERVIEW: This bulletin involves flash reprogramming of the Transmission Control Module (TCM) with new software.
MODELS: 2014 (WK) Grand Cherokee

NOTE: This bulletin applies to vehicles built on or before July 01, 2014, equipped with the 3.0L engine (Sales Code EXF) and the 8HP70 Automatic Transmission (Sales Codes DFD).

SYMPTOM/CONDITION:
(note: ** changes from prior TSB flash **)

· ** 3-2, 2-1 Shift bump on deceleration. **
· ** Shift quality during hard acceleration. **
· ** Excessive shifts during cruise control operation. **
· ** Intermittent delay shift condition. **
· ** Engine braking improvements during downhill descent. **
· ** Manual gear selection improvements at higher altitudes. **
· ** Drivability improvements in 4 low. **
· ** Hesitation improvements. **
· Inconsistent and/or harsh 1-2, 2-3, 3-4, 4-5 upshifts at moderate throttle.
· Inconsistent and/or harsh lift-foot upshifts.
· Inconsistent and/or harsh coasting 3-2, 2-1 downshifts in Hi or Lo range.
· Ratio fault detection during 1-2 upshift or 8-7 downshift.
· Grade hunting (repeated shifting while ascending a grade).
· 8-7-8 shift busyness when approaching max vehicle speed.
· Undesired gear selection at high altitude.
· Undesired gear selection when driving downhill (not enough powertrain braking).
· Time to exit TIP (manual/paddle shift mode) takes too long.
· Unintended downshifts driving at certain speeds.
· 4-3 coasting downshift may cause excessive engine noise during engine braking.
· Shift hanging when vehicle is started cold.
· Undesired shift toggling in Manual/Paddle Shift mode.
· Lo range selec-speed control 1-2 shift busyness.

Download PDF at: Jeep Grand Cherokee WK2 - 2011-2016 Grand Cherokee Service Bulletins and Recalls

--Milous
 

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It's the very top one under New.
 

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Thanks Milos going to go to the service manager tomorrow ,cheers mate


iPad @ JeepGarage
Re-read it Max, its for the 3.0lt V6, not our SRT's (although there was one for that months ago?)
 

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SRT8 ,HD,WRX,
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How's your tranny DCRSRT ? .. I had the last update and mine is still bad also have complained to the service manager . My last resort is to try the battery disconnect procedure or pull out the fuse and try that .


iPad @ JeepGarage
 

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2014 WK2 3.0 4x4
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172 Posts
damnit, I was just at the dealership yesterday asking about this exact problem and they said it's 'normal'. back to the dealer I go. Thanks for the update!
 

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The big question is whether AUS dealers have the software and know-how to perform the update? My personal experience is they say "it's normal" for issues they simply don't know.

Mmc
 

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How's your tranny DCRSRT ? .. I had the last update and mine is still bad also have complained to the service manager . My last resort is to try the battery disconnect procedure or pull out the fuse and try that .


iPad @ JeepGarage
Mine's fine, has the occasional clunk, but so did my 6spd in my Territory (both made by ZF). Considering how rare it is for me I haven't bothered to get the update, but my first service is due soon so will get it done anyway.
 

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So this is for the diesel. I thought it was the 3.6L models that were suffering from all the tranny woes? Are they all fixed?
 

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2014 JGC Overland
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At the dealer now having this applied. Came in for an oil change and was checking the forums while I waited. Perfect timing, thanks.

Will reply back later with impressions.


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2014 JGC Overland
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110 Posts
Dramatic difference. Drove about 20 miles on a combination of back roads and freeway.

Kept the Jeep in Eco mode the entire time and it was perfect. I usually turn Eco off as soon as I turn the Jeep on. Power delivery was extremely linear and the throttle was very responsive. Previously (in Eco), I would hit the accelerator, count to 3 and then go from crawling to full on throttle.

Didn't notice any bogging which would occasionally happen at random times (needs more testing). The Jeep feels like a different SUV, in a good way. Very impressed thus far. I have a 6 hour drive to Jersey and the same trip back over the next few days. Will report back on how it goes.


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Finally... this was really annoying me.
 
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