这个9 speed自动变速箱问题很多。 http://en.wikipedia.org/wiki/ZF_9HP_transmission
The 9HP transmission has been plagued with problems in the Jeep Cherokee and
the Acura TLX.[3][4]
Some of the cars utilizing the ZF 9HP, including the Acura TLX and Jeep
Cherokee have had transmission-related recalls or TSBs issued.