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post #1 of 34 (permalink) Old 05-19-2014, 11:09 AM Thread Starter
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MAKE STICKY: ALLPAR Cherokee Flash Page

http://www.allpar.com/news/index.php...-flash-details
Posted on May 16th, 2014 • by David Zatz

Chrysler has issued a service bulletin that clarifies the “flash” upgrade, which updates the transmission control software on Jeep Cherokees built before May 5, 2014.

Bulletin number 21-018-14 points out that the software helps overall shift quality and throttle response, with specific improvements to:

Shifting out of park
Automatic downshifts while coasting
Prevention of “busy shifting”
Prevention of “transmission confusion” when drivers go into heavy acceleration, then suddenly lift their foot “change mind shift”
In addition, it can address conditions that cause the computer to record these errors:

P072F (stuck in fourth gear)
P076F (incorrect ration in seventh)
P0810 (clutch position control error)
P1CC9 (unable to engage gear)
P0734 (fourth gear incorrect ratio)
P071B (torque calculation performance error)

Sometimes, powertrain computers have been known to falsely record errors, and we do not know whether the issues above were caused by actual problems, solved by the software, or by false alarms.

The correct procedure should take around two hours, nearly all of which is a drive designed to train and test the transmission. Actually updating the flash should take around five to ten minutes, but the “adaptive drive learn,” which must be done by a skilled employee, takes much more time, and customers may want to observe the process to make sure this part is being done.

Customers are to be informed when the update is fully prepared, reportedly sometime in mid to late May.

Firmware updates for powertrain computers are not unusual, and can be issued long after a car is on the road. As transmissions have become more complex and have gained additional gears — from four to nine in less than a decade — programming has become an ever-greater challenge for automakers. The ZF transmissions have the ability to handle dozens of shift maps, depending on conditions; for Cherokee, the situation is complicated by the addition of all wheel drive, as well.
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post #2 of 34 (permalink) Old 05-19-2014, 11:49 AM
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Awesome find @eak. Just in time for my second oil change

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post #3 of 34 (permalink) Old 05-19-2014, 12:47 PM
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Only thing the adaptive relearn does not have to be performed on all.
Specifics are listed in the actual TSB.
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post #4 of 34 (permalink) Old 05-19-2014, 12:49 PM
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I noticed that when reading the TSB. If you had teh december TSB done then you don't need to have the relearn process done. So it will be quick.

John

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post #5 of 34 (permalink) Old 05-19-2014, 01:11 PM
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@70GT6 i always learn something new everyday. thanks.

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post #6 of 34 (permalink) Old 05-19-2014, 01:23 PM
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Originally Posted by Hudsonhawk View Post
I noticed that when reading the TSB. If you had teh december TSB done then you don't need to have the relearn process done. So it will be quick.
If you haven't had the December TSB done, does this mean you would need to do the relearn after the May flash? Or Would have to have the December TSB and then this Flash done? Or is all that's needed is the latest May flash?

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post #7 of 34 (permalink) Old 05-19-2014, 01:49 PM
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Thanks for the info eak. Just got back from the dealer and car is going in tomorrow morning for oil change and TSB. Wonder what the shifting out of park correction is for. Happened Friday and again on Saturday. Shifting from park to reverse to back out of a parking space and transmission appeared to be in neutral as the car wouldn't move till I returned to park and then back to reverse.
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post #8 of 34 (permalink) Old 05-19-2014, 03:39 PM
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Originally Posted by spicedham View Post
If you haven't had the December TSB done, does this mean you would need to do the relearn after the May flash? Or Would have to have the December TSB and then this Flash done? Or is all that's needed is the latest May flash?
There are actually 2 TCM software pins that do not need AL TSB 21-13-13.
They are 682235$$AN or 682354$$AN. $$ are wild cards for any number.
Any other update software must follow TSB 21-13-13 or undesirable shifting can result.
Your dealer will know.
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post #9 of 34 (permalink) Old 05-19-2014, 04:16 PM
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Your dealer will know.

HA_HA_HA_HA_HA_HA_HA_HA!!!!


You're kidding, right?

Sounds like some of the dealers don't even know the KL has been released...
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post #10 of 34 (permalink) Old 05-19-2014, 04:24 PM
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Originally Posted by Jeepster1 View Post
There are actually 2 TCM software pins that do not need AL TSB 21-13-13.
They are 682235$$AN or 682354$$AN. $$ are wild cards for any number.
Any other update software must follow TSB 21-13-13 or undesirable shifting can result.
Your dealer will know.
Thanks for the info!

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