[Nigel95]

Have a 95 Jaguar V12 Sedan with the 4L80E transmission and very odd behavior on daily start up so appealing to the 4L80E experts here Transmission won't shift up until 1) the temperature needle begins to move, generally a couple of miles or 2) the transmission drops into limp home mode. Then you pull to the side of the road, kill the engine, restart and no problems rest of the day. Codes say "output speed sensor" is the issue but if so, why is everthing OK after a warm restart - it can even get completely cold again and no proble, just the first time in a day.
Just seeems so illogical.
Is there any direct relationship to engine temperature in the transmission ?
Any other ideas ?

Thanks for your consideration.
Nigel95

 

[GM Loyal]

My first point of concern would be the electrical connections at the transmission.
The first indicator is temperature related.
A connector / terminal may be enlarging with heat and then making good contact.
The 4L80E was extremely reliable under all circumstances, but electrical issues should be familiar to Jaguar owners. ;-)
Let me know if there are any trouble codes.