Hard Downshift Question
#1
Hard Downshift Question
My 2008 XK has 54K on the clock. Recently I have noticed an intermittent problem with the transmission. When coming to a stop, gradually not rapidly, the transmission "clunks" from second to first.
I have a bumper to bumper warranty, which will cover the transmission, if in fact this is a mechanical defect. That said, I'm curious if anyone out there is familiar with what I have described?
Thanks in advance....
I have a bumper to bumper warranty, which will cover the transmission, if in fact this is a mechanical defect. That said, I'm curious if anyone out there is familiar with what I have described?
Thanks in advance....
#3
#4
Two possibilities I'm aware of. One is battery, although you'd likely notice bumpy downshifts between all gears, not just 2nd to 1st. Other would be that the transmission could maybe use a service. Jaguar claim it's "sealed for life" and don't routinely service transmission units as part of the service schedule but it's known among owners of BMWs with the 6HP transmissions that transmission servicing can cure and/or prevent this.
Does it happen all the time or only for the first few minutes after the car is started from cold? Mine does the latter, it gets better once the car has warmed up. This would suggest that the transmission fluid is past its' best, it's on my to-do list for spring-time.
Does it happen all the time or only for the first few minutes after the car is started from cold? Mine does the latter, it gets better once the car has warmed up. This would suggest that the transmission fluid is past its' best, it's on my to-do list for spring-time.
#5
It seems these ZF boxes have a lurch downshift from 2 to 1 in certain cars. Apparently this was very prevalent in X350 Jaguar XJS and S Types. I personally don't think that fluid has anything to do with the issue. Seems like an electronics thing.
You might have the TCM adaptations reset by the dealer and see if that helps.
You might have the TCM adaptations reset by the dealer and see if that helps.
#6
#7
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