Hi Guys,

this is driving me crazy for a while now.
It started about a year ago, with intermittent "tranmission failure" and "cruise not available", "handbrake fault" messages. First of all, we cleaned the socket on the back of the transmission, and the problem gone for about 3000 miles. It reappeared, cleaned it again, same story.
Before that I had the tranny oil changed atthe dealer, I asked them to replace the gasked, which they did not do, unfortunately I realized it too late to go back and complain (they did not charge it either).

When the issue became more frequent, I went to a transmission specialist, they changed the oil, replaced gasket, and that should have been end of the case, but no. Although I found some oil in the socket again, it was not that much.
And the issue comes basically every time I drive more than 20 miles. If I let it cool down, disappears, until the next longer cycle.

I read the codes with SDD, I attached the screenshots.

Ok, it might not be the transmission socket, but where should I start investigating then? ECU? Instrument cluster control module? I would appreciate any advice, becaue I'm a bit lost, I've been to the dealer, but they could not figure out anything because they said it's too much codes, it can be anything...

Thanks in advance for any ideas

 

I just read another thread here where oil contamination was the root cause in the transmission socket. However I'm suspecting that as well, I just can't make my dealer beleive it. They said "that socket can be fully poured with oil, it should not cause these type of problems". I don't agree, but they are the only dealership here...

 

The original mechatronic sleeve has been superceeded presumably because it tended to leak.

Check cabin filter area for water which can affect ECU.

suggest that you do not use main dealer.

https://www.thectsc.com/

 

the source for and return point for all can bus comms in in the cluster .
these code do point to a cluster loom or can chip comms issue .
so first clean the mechatronic plug and socket thoroughly with electro clean .
there should be no oil at all in the plug . so check that again .
failing that have the cluster loom and or the can chip solders checked .

 

Update: I lifted the car, and througroghly cleaned the transmission socket with brake cleaner and contact cleaner. Of course there was oil in the connector So I think the sleeve was not changed, or was changed badly

Needless to say, 200 miles without a code since then. So although I'm not sure that this is the only cause, I will not take any steps further before solving the oil leak problem.

Actually I'm thinking about to replace not only the sleeve (I'll call the ZF official service, I don't trust JAguar dealer any more), but the connector (or harness). However on SNG Barratt and other sites I cannot find complete harness or connector, only for V6, which I'm not sure that will fit.

I really appreciate your answers guys, I'll keep updating, and do not hesitate to share any new ideas with me

 

Hi Hooshee,

It's not difficult to replace the connector sleeve yourself.

For the benefit of others who haven't dealt with the electrical connector, it is shown in the photo below. Note the dampness indicating the sleeve is leaking:




Here's a view of the harness connector showing that it is also contaminated with oil:




To drain the fluid, just remove the pan drain plug and allow the fluid to drain into a clean catch container (if you intend to reuse the oil) .

Pull down on the white plastic sleeve latch to unlock the sleeve:



The sleeve has a tab molded into the inner circumference so it can only be installed in one orientation:




Cheers,

Don

 

Hi Don,

thanks for the pics, It really helps. Yes, I think I will replace it myself. The only thing I'm thinking about, the last oil cange in the tranny was about 6 weeks ago, so of course I'll reuse what I can (and will buy one liter or so just in case). But should I replace the pan again? I really don't like this plastic design to be replaced every change, but if it's a must then I'll change it again.

 

Hi Hooshee,

No, you should not have to replace the pan/filter again - just take care to clean the gasket and gasket mating surfaces thoroughly again and torque the screws in the proper type of spiral pattern to the specified torque and you should be fine.

Cheers,

Don