According news from Jeep, they are issuing a transmission control software update for the Jeep Cherokee build before 5/5/2014.
The issue was brought up by the Cherokee owners that complaining jerky transmission operations during driving. The Cherokee’s 9-speed transmission is sourced from ZF. As you may remember from our previous technical analysis of the ZF 9HP transmission, due to how it is designed, the downshift from 8th to 5th, 8th to 4th and from 9th to 5th gears will be quite challenging for this transmission.
While we are not sure the exact details of this software update, it is quite possible that the jerky feeling may be partially contributed by the factor mentioned above.
This software update is not a recall, only customers that have such complains and take their car to dealership will get the fix. However I can safely bet that almost every Cherokee owner will have his/her dealership update their transmission software.
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