I have recently ran into a strange problem with my jaguar. I have a 2002 X-Type 2.5L and about 2 weeks ago I was driving back home when my shifts got really strange around the 35 mph mark. It would jerk back and forth a little so I would slow down and kept going. The Gearbox fault light came on and the car started revving instead of engaging. Luckily, I managed to drive into a park before my car stopped moving entirely. As of now, the car remains in the same situation, It will not move. When I turn it on, sometimes the car will jerk froward in Drive for a little bit before stopping again and sometimes drive wont work (please note that drive works only sometimes and not for a long enough time for me to drive the car out of the garage even). Reverse does not work AT ALL. I have been fiddling around with it for the past 2 weeks and cannot get anything to work. I have scanned for codes and all I get is P1000 (useless), B1205 (possibly unrelated as my trip counter wouldn't work anyways before the issue), some ATC codes (possibly unrelated as well as they clear) and P1582. When I clear the codes, P1000, B1205, and P1582 do not clear but remain. As I understand (I could be wrong) P1582 is a code that pops up when limp-home mode is activated although I am unsure whether the limp-home is activated or not, since the car was moving in drive a little bit before it stopped moving at all (the time period before first fault and my drive to the park). In either case P1528 from my understanding would relate to throttle body issues. I changed my throttle body with another from the junkyard and even one of the connectors going to it and still no luck. I am starting to think it may be my transmission fluid although I am not sure and cannot understand how my transmission fluid suddenly stopped working one day at 67,000 miles. I need to clarify this is not a startup issue as my engine runs. My car turns on but when i put it into gear I can't feel the transmission going into gear (except when it jerks into drive for a tiny bit) and the engine revs but car doesn't move. Because of this it seems electrical to me but the issue was not fixed when I changed my throttle body. In total, what would you all recommend? I have not seen any issue similar to mine as my car doesn't move but the engine works fine, and the transmission works sometimes for a tiny distance in drive. What should I try next? What could be broken? and how can I further diagnose my issues? How can I diagnose if my new throttle body is working properly or not? Thanks a lot for any input as I am basically stuck at this point.

 

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I bought a few cars dirt cheap with "bad transmission", they had no ATF, transmissions were fine.
S-types don't have dipstick, I don't know about X, mine has manual.