So I have posted before about my transmission problems on here and had some great advise as to possible fixes (fluid/filter, re flash) and after doing that fluid/filter swap I still was having the issue and even more so. I then proceeded to take the car to two repair facilities, one a Jag/RR specialist and the other a ZF tranny specialist. Both said they couldn't flash/update the trans as there were hard faults associated with it thus needing a new transmission.

Skip a head a couple months (as the car sat in the garage) to other possible solutions (flushing the whole system) and I tear my rotator cuff and am basically done working on my car. I then start sourcing people to replace the transmission. Stay with me this is the part you want to read.

I finally succumbed and called Jaguar North Scottsdale where it was sold new and asked for a cost as I didn't trust the others I had talked with. The service guy said directly you don't want us to do the trans, its like 9K with a 12/12 warranty. He offers up a local company called British Automotive Repair in Scottsdale AZ (Im also in AZ but like 45-60 min away). I call them, talk to the service manager (Tim) and tell him whats happened, he says he hasn't had to do a complete rebuild on one of these transmissions in the 10 years he had been there, says he thinks its something else. Says have it towed up and he will check it.

I got the call and guess what, it DOESNT need a transmission. It did however need a #6 cylinder coil pack. Yes, for what told me is the 4th time in 10 years a bad coil pack was causing all the transmission issues. He replaced the coil, has driven the car 15 miles both local and on the highway and it runs perfect, shifts perfect.

Now he said they scanned the trans when it arrived and found no faults (funny how the two other places claim there were) but scanned the engine and found the coil fault (I knew it was missing but wanted to address the trans first). Having dealt with it before he replaced the coil then re flashed the trans (because it needed it anyway) and it runs perfect.

$324.51 out the door.....

Now he also told me the trans bushing was leaking and almost flat so even when the fluid change was done it was never fully refilled because even though the car was level the trans pan wasn't. $297.50 and that's fixed. Lastly he found that the water pump was dripping and this being the summertime in AZ it should be replaced. So now that's done also.

I was prepared to spend 5-6K for a trans.... plus I still had to deal with the misfire and didn't know about the water pump. Everything done and out the door for less than $1200.00. I am one happy camper for sure.

So my advice for what it is, make sure if your having trans issues that the car itself is running perfect before going into panic mode.

He also confirmed that the Ford Mercon (sp ?) fluid is a equal replacement for the Jaguar lifetime.

Hope this helps a couple guys and maybe just add a note to the whole pinned tranny post.

Also I have a case of Mercon and a full flush pump new in box if anyones interested, LOL.

 

I and motorcarman had said this before. a coil pack can do and most notably I have seen this over the years when using aftermarket coils. My educated hypothesis is that defective coils or aftermarket cause dirty electrical signals and the wiring runs from ecu to coils and back right along with can network for the trans and I think it probably corrupts the can network signals causing poor shifting and things like 3/4 clutch failure or others. However I still recommend a drain and fill with pan, sleeve and software update because this has been 1 of the first recommendation from ZF since somewhere in the early 2000's for trans faults. Thanks for bringing this up again real world.

 

Hey Mr. Fox, glad you got the right person to fix the Car. I to had the same issue. I came on to a main road with my 2005 XJr and there was a car coming at a high rate of speed from a grade that kept me from seeing him until he was level, so I punch the throttle pedal to the metal and as usual the Jaguar took off like a bat out of hell . As it shifted through the gears I notice a miss like shift, I got the Trans fault light and the performance issue light. when i came to a stop at the signal light the trans felt like it was shifting in and out of gear with hard bangs. very scary. There was once where I thought it was going into reverse.I was positive I fried my trans. I took it to a trans shop near by that told me he was a specialist on these transmissions. He had it for two days and said he couldn't tell me if it was the trans or the engine, he did say the trans was going into neutral at high speeds. I did have a regular jag shop in the neighbor that's done a lot worked on my car before but thought it was diffidently the trans so I took it to the Jaguar dealer. They told me it needed a new trans for some astronomical figure and suggested I take it else where. I was just going to park it and try to locate a trans buts that's a large undertaking . I finally called my local independent Jag shop who knew the car well and ask me if the dash showed a engine performance warning. I said yes he said I'm sure i know whats wrong with it leave it with me for a couple of hours. He called me back in an hour and said all fixed. I said really! He said it needed two coils and two plugs.come get it. He also said when ever the engine performance light comes on its usually a problem on the engine side. When ever you get miss fire it sends mixed signals to the trans.Hope this else someone else.

 

Thanks for saving us all a sh%# load of money.

 

Identical to what happened to me, started after I punched it then it would slip in and out of gear and also do so at a stop light. WOW.... same with the "expert" tranny and Jag repair places till like you I found "the one". Good for you and thanks for sharing.

 

Hi
I'm in Tucson and have done a drain and fill, but was getting up the willpower for a full flush. First, thanks for the article - I can't find a good Jag indy in Tucson, so thanks for the shop name - it's worth the drive! And, second, PM me if you were serious about the pump.....

Dave

 

Same thing with my VDP. P0306 on number 6. Trans seemed to have a problem but is was just he misfire. New coil and everything is fine.

 

Is it possible for this to happen on the X308? Different engine different trans but same computer system right? Correct me please 🙏

 

What codes do you have?
That will guide you on what to repair.
.
.
.

 

Good to hear! That's a great result and glad the car is fixed. Hard to find someone decent to work on cars these days. I try to do everything myself, but its always good to have a reputable shop to fall back on when there's something you cant get to yourself. I'm also getting older and priorities have changed, don't feel like working on cars much anymore.