In the valve body are the electronic solenoids. Jag techs have no way of testing those. They always replace the valve body as an assembly. So that explains the problem. I also had a solenoid issue. But because others said that it could not be the trans itself, I continued to drive the car until it had a complete trans failure. It was not until I took it apart that I found the real problem.

 

Dealer replaced valve body under warranty.
They tell me it is still exhibiting same behavior and this did not solve it.
Now they have submitted request to Jaguar to replace entire XF transmission.
Said it will all be covered under warranty.
Can't understand why valve body replacement did not work.

 

It could also be the megatronix computer in the transmission. I had previously assumed that the replacement of the valvebody included the megatronix. But some have told me that it was not part of the replacement. The issue on my transmission was that I did not act fast enough to fix my issue and it did damage to the internal mechanical parts in my transmission. But whatever it is, it is a transmission internal issue which most Jag technicians do not have knowledge to diagnose. They simply leave it to the ZF experts.

 

Just a comment?
It's called Mechatronic and it's the valve body/shift solenoids. The computer is the TCM (Transmission Control Module) and it's mounted internally on the ZF 6 speed.
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Thanks! Got it now.....sorry for the misinformation. I was going by what someone called it on YouTube.

 

Dealership just notified me they got full authorization for Jaguar to replace entire ZF transmission.
Waiting on parts, will have appointment in next week.

 

That is usually how they fix the problem. They do a replacement and then ship yours to the ZF Repair Center. It is there that they rebuild them and get them ready for the next customer. Jag techs have no clue how to fix them at the dealership.

 

Okay, I have read this thread and numerous others regarding a lurch when coming to a complete stop. Here's my experience: I live in Southern California. I purchased a CPO 2011 Jaguar XF Supercharged in February of 2013, with 12,951 miles on it.

1.) At 21340 miles, August 18, 2014, I had the car in for the 45,000 mile service. The dealer insisted that if I did not get the services done on a time rather than miles basis, my warranty would be void. In retrospect, I noticed a line on the invoice that I did not understand -
D JO38 ENGINE MIL ILLUMINATED.
CAUSE: PERFORMED JO38.
869913 REPROGRAM EXISTING E.C.M. USING IDS/SDD

Subsequent to this, I notice that the transmission was shifting oddly from 2nd to first. This would happen rarely, and generally after driving the car for several short trips in the same day. The transmission seemed to stick in 2nd and lurch slightly forward just as I would come to a complete stop. I have not idea if this started to occur as a result of any work done by the dealer on the previous visit, but I mentioned the above reprogramming to be complete in presenting my problem.

2.) At 21,575 miles, September 3, 2014, I returned the car to the dealer and test drove it with the Shop Foreman to demonstrate the downshifting problem. I wanted to make sure he knew what I was referring to, since the car did not exhibit this problem until it was heated up and only after a stop or two where the car sat for a few minutes or a long stretch in stop and go traffic. It was incredibly annoying in Southern California stop and go traffic, which is quite common on the freeways during commute hours.
- The valve body was replaced on the transmission
- Performed hard reset and programmed tcm as new

3.) 26,830 miles, July 29, 2015 - 60,000 mile service performed. The occasional downshift jolt was dismissed as normal or not noticeable by the dealer

4.) 32,660 miles, July 25, 2016 - downshifting issued reappeared predictably after the car heated up and was driven a few miles.
- Transmission assembly was replaced
- Configured P.CM using IDS/SDD
- Cleared TCM Adaptions using IDS/SDD

5.) 33,608 miles, October 11, 2016 - transmission continued to jolt when coming to a stop. Road tested with Shop Foreman.
- Control arm bushings were replaced

6.) November 16, 2016 – Battery replaced – transmission jolt continued.

7.) 34,852 miles, February 10, 2017 – Road tested with the Service Manager – transmission still lurching. - Transmission was replaced again.
- This time the fluid cooler was also replaced, which was not replaced on the previous transmission replacement.

8.) 37, 205 miles, October 9, 2017 – Transmission lurching continued. Took car to another Jaguar Dealer.
- Cleared adapttions
- Checked Air Intake system
- Checked Transmission fluid for contaminations
- Changed Throttle Body and Hose, Connector, Gasket


8.) 37,354 miles October 30, 2017 – transmission jolt continues. The dealer has confirmed that it is not a transmission issue. The tech notes state, “Able to verify costumer concern only after driving at least 20-30 miles, found occurs happens aprox %50 of the time. Found when vehicle comes from a deceleration to a complete stop the engine RPMS go to idle only briefly (600RPM), then bump on its own to aprox 800RPM for 1-2 seconds.”

The Shop Foreman now believes that the cause may be one of (29 ?) sensors on the car, possibly the Mass Air Sensors. They need a donor car to confirm, so my car has been returned to me.

When I contacted Jaguar Customer Service they suggested bringing the car back to the original dealer. It sounds to me like the 2nd dealer is trying to pass the issue off because they have no idea what is wrong with the car.

The issue is so complicated that I am at a loss as to what to do. Jaguar does not want it as a trade-in, they say they want to fix it, and I wouldn't stick it on anyone else without revealing the problem. Other than the jolting that occurs after 20-30 miles of travel, the car is in perfect condition -- kept in garage and meticulously maintained in like new condition. Any and all comments/thoughts/suggestions are welcome!

 

I think you have a lemon dealer and/or car.

What you need is a replacement / refund / tech who actually knows how to diagnose.

 

Yes, agree... I need a tech who will take the time to diagnose the problem. After 2 transmission replacements - both supposedly new transmissions - I can't believe that it is a tranny problem.

The last two dealer visits were to a different dealer than the one who sold me the car. Both dealerships are owned by the same company, but the people overseeing the work are different. So you would think that I would get lucky at one of the dealerships and find a tech who could sort things out.

Thanks for comment,
Sailorsee

 

I am curious to see how this was solved. You say they replaced the transmission twice without fixing the problem? I find that hard to believe. I also don't believe that the other sensors in the car are causing this problem. I still think that the transmission is the culprit and that they did not actually replace it. They tried to fix it somehow maybe even replacing it with another transmission that was improperly rebuilt or fixed. I replaced mine for pretty much the same issues. And now it runs perfectly fine.

 

I am waiting to hear back from Jaguar Customer Service. Nothing done since last post.

I have been assured that the transmission was replaced both times with NEW transmissions. Once without the oil cooler and the other with the oil cooler. I waited 2 weeks for the transmissions to be shipped from Germany. The work was done under warranty. I was told by the service manager that it would have otherwise cost $16,000 to replace the transmission with a new one.

After the 2nd replacement the symptom became more of an rpm surge after the car comes to a complete stop. Here is a video that shows the
RPM dip. the video was slowed down slightly to demonstrate the dip
http://jakespear.com/jaguar/Jaguar_RPM_dip.mp4

 

If new, a look with the car in the air will show it. All shiny and bright instead of dull and dirty...

Hopefully a serial # / date code etc too.

Also, someone will have an audit trail (invoice etc).

 

If the first trans was truly "new" then it would not be logical to replace it a second time. They should have replaced something else. I would not trust any shop that had to make two replacements of the same part. Repair shops should have mechanics and not "parts changers" that will continue to replace parts until the symptoms are resolved.