Can you check the voltage prior to starting the car? My guess is that it is the range 12.2...

worked overnight, drove it 15 minutes to get home, sat for 4 hrs --reading 12.33

How old is the battery and can you get a load test on it?

I am asking a bunch of questions because I am experiencing the same issues and I am documenting a bunch of stuff to see what I come up with. I have been in contact with ZF engineers with hopes of a solution. It appears BMW, Audi, Range Rover along with Jaguar are experiencing the same thing with the same results. I am about to remove my TCM and have it tested so understand I am not trying to give anyone a hard time just want to gather information.

Really, poor transmission performance when cold??? Same year and model? Ill try to get load tested this weekend

Question, What is the "Sleeve" that should replaced with the pan/filter?

The wiring passes through it. Covered on here lots of times :)

Yes, Please search for a thread by a guy named CCC. Great pictures and very good explanation of the fluid change. Shows all the items needed for a change and where to get them for a good price.

I used that thread to purchase all the parts/fluid and then had my local Jaguar dealer do the change and re-flash the TCM.
.
.
.

Battery load test was normal

I thought I was on to something with the battery voltage but after a full charge on my car I still had the problem today. I am on a mission to find out why this is taking place. I will continue to post as I go along but for right now I have no solution. I hope it does not take me as long as it did on the hyd hose.

Take a look at this http://www.jagrepair.com/images/TSB/...S307-17am2.pdf

Gus - which ZF do you have? The 5HP24? Or which car is it in, if not those in your sig?

I have the 5HP24.

This is my post relating to my Transmission issue. Any information you can offer would be greatly appreciated ZF Transmission shifting issue - Jaguar Forums - Jaguar Enthusiasts Forum

Thanks. I don't recall that specific set of things being an issue with the 6HP26.

We have this one, my car, Matt and one other that I am unable to find. Along with that one post on a BMW and another two on Range Rover all using the ZF transmission.

Those all have the same specific issue? You described it in such a way I figured it would be unique!

Also, are the 5HP24 and 6HP26 so similar?

Don't think I've ever seen proper pics of either of their TCMs let alone know what CPU they use.

I do not know all the answers to your questions but I have been working on this for a good period of time. Yes both 5HP & 6HP have similar problems. I have been in contact with ZF and was planning to call them again once I gather a little more info I do not like to go forward without all the info I need. As for the TCM & ECM I do not have all the info but that is what this fact finding mission is about. I do know that ZF was leaning towards a command/signal issue at this point I myself am not sure that is the case.

Wow - sounds "fun". Do you have a Mongoose JLR (or AE) and can maybe read some of the signals etc?

No i do not but part of my process to find out why.