Our 2016 XJL - 40K mile transmission is reluctant to shift to a higher gear when in "S" drive. This also happens when I use Dynamic diving in either "D" or "S". All is fine if I just use "D" drive. It will upshift through the first couple of gears then stop upshifting, leaving the engine running at 3,000 to 4,000 RPM's. Sometimes, if I hold a steady speed, it will upshift a gear or maybe two, but never lands where it should. If I engage Cruise Control, the transmission will upshift properly and operate normally.

Since it performs properly in "D" drive and also on Cruise Control, I'm thinking it's not so much a mechanical issue as maybe it's a software issue? Has anyone experienced this on their XJ? Any clues?

 

Have a '17 XJL with 36K on the clock. Have never experienced your issue. Based on symptoms I am leaning toward some type of "software"/control module issue over a mechanical one, though I'm out of my depth. Particularly because engaging cruise control seems to remedy the issue. You'll need a shop with Jaguar diagnostics. Good luck. Please let us know what you find out.

 

uhhh that is what "S" is for, sporty driving and holding gears, to redline if necessary. If you are not driving the car hard, keep it out of "S"

Your car is fine.