Ed, how did you determine it was the ABS/wheel speed sensor? Did it throw another code? I'm only getting P0735.

Also, can someone explain what the e-clutch is? Is that a torque converter lock up?

Thanks,

Hello!
I was with a X350 4.2L with transmission fault, Restricted performances BUT no DTC on the transmission!! The only DTC was if I remember well P1643 no communication between TCM and ECM. (some time with this Can bus error too with ABS or Instrument cluster.
When I was starting, if I was needing to pull the accelerator the car was going in limp mode and was fixed in gear 3. If this was happening after few meters, the transmission was going in gear 5 (no light on the J gate etc.) So, I drove one year in gear 3 in city, gear 5 on speedway!!
I tried the ABS connector, Instrument cluster connectors, then controlled the can bus, I also connected the TCM can bus directly to the ECM bypassing the connector, changed TCM oil, verified level few times, reseted the TCM adaptation, etc... always the same! I tried to change the Valve body for another rebuilded, still the same problem! As the problem was CAN bus communication, between TCM and ECM I changed the valve body + TCM coming from another car and installed them in my car! Same problem again!!
Finally, I found why the transmission was jerky and limp mode and no CAN bus communication. It was exactly what I was meaning since few times.... ECM Torque signal fault. It was the ignition coils!! I changed all my coil, and my car worked normally!!! Big power, no can bus fault, no misfires etc. A new car!! Reason I was meaning, was when exiting from my underground box I was needing more power, so pedal going down and ... voila! communication fault, gear 3 or 5 blocked, no lights on the J Gate!
So, I was thinking the ECM is sending a Throttle position sensor which is like big acceleration, because as he coils was not firing correctly, the Transmission was thinking I needed big power!!
So, in conclusion, if the J-gate (sport button flash or stay fixed when you turn the key) or you have the Can bus error between the ECM and TCM then Limp mode etc. look at your coils, candles etc... principaly if you have DTC with misfires. Hope this could save money and time to many peoples with transmission problems!

I must say, that in the past I changed my ignitions coils few times, but no original coils, some aftermarket. Transmission worked one week / 2000 kms, then failed!
Now I bought more expansives coils from LUCAS (www.rld-autos.com) 57,48 €
and I have my 300 HP and transmission very smooth!
So, be carrefull of ship Ignitions coils....

​​​​​Hi. I am in the middle of a similar thing with my 2003 x350. Abs , dsc , gearbox fault light's and the jerky misfire. Up to now I think the judder / misfire is some thing to do with the abs putting on the bakes intermittently while im driving as when I disconnect the abs sensor the car dives fine gearbox smooth as silk no judder but abs/dsc lights constantly on. Changed off side rear ( uk) code 1165 showing but car still juddering and gear box fault returned. Now my thinking is the rear abs wiring loom/harness is to blame. Im finding it hard to source a new one in uk. Are there two separate cables to rear abs sensors or one does both because I can only see where one cable enters car under rear seats or am I looking in wrong place? Can I even get new sensors for rear? Fronts are no problem or could a s type cable fit the x350?
thanks
steve

https://www.ebay.co.uk/itm/1x-JAGUAR...-/302554967168

What was the full code U1165?

Hi sorry C1165 and C1235 and C1144 although speed sensor tone ring is mot missing a tooth? I am reluctant to change tone ring just yet as its a big job taking off drive shaft and universal joint when it looks fine.
Thank you

If the reluctor ring looks ok ie not loose, not very rusty, or bridged in one area then it should be ok

C1235 is indicating that there is no signal to the sensor so I suggest that you carefully examine the wires to the sensors in the area of the wheel well

and look for any damage.

You could have a problem with the abs module which can get complicated.

SOLVED: Abs light on fault cods are c1235 and c1236 - Fixya

Btw where are you in the UK?

Hi! I was with the same problems before finding it was the coil. I changed the rear ABS sensor, but generally the problem come:
1) from the ABS connector (bad connections) or
2) the ABS Module itself.
When I changed the ABS module (with used) the rear sensor error vanished.... Hope this can help.

Hi there. I have a 2006 XJ8 VDP with the same issue (Gearbox fault, limp mode, jerky etc...). I looked last weekend at both speed sensors on the back and they look new. I did not check the reluctor ring in detail so perhaps I will get the wheels off again tomorrow and have a closer inspection. One thing I did wonder was if the car has speed sensors on the front. The car is RWD so not really sure; there was a wire heading into the middle of the wheel at the back of the front wheels, but i was weary of trying to pull the plastic cover off, so I left it. If anyone knows that would be great.

Incidentally, I bought a new battery a month or so ago because of all the faults that I had, plus it would not keep charge for long. The new batter turns the engine like a champ now, so I have ruled out the battery as the culprit for the gearbox fault. About the same time I re-grounded the front left top ground (as you look at the car) as it had sheared off. That solved a number of problems. I have not done the lower yet, but it looks intact.

The ignition coil/spark plug scenario is an interesting one which I was planning to tackle tomorrow. It seems odd that a fault in a spark plug could throw a gearbox fault, but hey, it's a Jag!

The other electrical related issue that I have noticed is the fuel gauge. It doesn't always register and some times spazzes out up and down before settling. Is that symptomatic of something related to this?

I don't have a code reader so most of the fixes that I am trying are done blind and on the recommendations from this forum; Perhaps I should buy a code reader.

Thanks all for your continued support. I'm not sure how any of us would stay sane without the forum.

Hi Leslie,

You really do need to know the Diagnostic Trouble Codes (DTCs) related to all of these issues. You can waste countless hours and dollars trying to rectify problems you don't even have.

There are plenty of engine-related problems that can trigger gearbox faults, because the Engine Control Module and Mechatronic/Transmission Control Module have to work together to orchestrate smooth gearshifts, and if there is a problem with, for example, the Mass Air Flow Sensor, the engine torque signal required by the transmission may be corrupt. Problems with the Controller Area Network (CAN) digital communications bus can also lead to gearbox faults.

I would suggest you find a good independent shop with the necessary equipment to read all of the proprietary Jaguar DTCs, including the extended Powertrain (P-prefix) codes as well as the Body (B-), Chassis (C-) and Network (U-) codes. It should not cost too much to have the codes scanned and listed for you. Post them here exactly as they appear and we'll try to help. I may move your post to your own thread for you since your issues may lead in different directions.

P.S. Yes, your car has ABS wheel speed sensors at all four wheels.

Cheers,

Don

Thanks Don I will see about getting the codes read.

Hi!
>It seems odd that a fault in a spark plug could throw a gearbox fault, but hey, it's a Jag!
It was 100% my problem!
Also, there is 4 ABS speed sensors, all going to the big ABS module in front of the engine.... (look here first, as there is many problems with this connector)
For the coils.... when you pull the pedale, this send to the ECM (engine module) the position and the ECM send to the Transmission the position too. When some could do not work, you need to pull the pedale much more and this send to the transmission an information which is not correct and the transmission jerk!! (same if there is a problem with the throttle body!)
I have been two years with this problem, and tried all possible solution (ABS sensors, ABS module, Transmission module, transmission valves body, ECM too etc... and solved my problem with the engine working normally (changes of Coils).
If you start the engine, and when pulling the engine more than 2000 T.M and you have the orange led visible and limp mode engine and or TCM fault, it is probably because all cylinders are not working wheel (I was with misfires, some times not the same cylinders...

gearbox fault
 

Thank you both restorsc and meirion1. you both have mentioned abs module there so maybe that's my next route. And Meirion1 im in Leicestershire UK.

Update on my issue.

I bought a code reader and the one cade that it managed to read was something to do with the throttle actuator sensor, but I deleted all the codes to do a live data read, and I haven't seen it since.

So after driving the car all week with the code reader attached I have not had any issues or codes (typical), but it has also been fine weather. Today I noticed that it had rained heavily last night and wondered about the issue people have reported with that one connector under where the water/leaves drain.

Anyway, I drove my kids to school and BOOM, Air suspension fault. Code reader doesn't pick it up, but it's there. I am guessing the reader I have is not up to snuff to get all the Jag DTC's. Nevertheless, it would seem as though the weather is making a difference. I will continue to monitor with this Innova 3130 for the time being and report any codes that I see. Incidentally I have not had a GEARBOX FAULT since the weather improved and purchasing the reader, which makes me confident that it is not a mechanical failure when it I do get it.

In case you are following this thread and missed the codes that I posted in the main forum

https://www.jaguarforums.com/forum/x...0-lr-j-219350/

Lots of codes

Software
 

Don B or any takers... on the subject of knowing your trouble codes, I need software for my WDS. Looking for Aston Martin DB7 GT. My XJS stuff has saved me big money. If anyone knows of members who have lots of disks please let me know. Someone always knows someone else.........smile!

Hi GTO Guru,

Try sending a private message to our member motorcarman (Bob Gauff). If anyone knows where you could find DB7 disks he may.

Also keep an eye on eBay. Stuff shows up there from time to time. Search "WDS," "Jaguar WDS," "Aston WDS," "Ford WDS" and "Rotunda WDS." Here's a current example:

https://www.ebay.com/itm/Rotunda-For...Cclp%3A2334524

It could help to know the disc numbers you need since sellers often have no clue as to what they are selling.

Cheers,

Don

Clearing codes isn’t ‘flashing’
 

Even if the original poster is no longer responding or commenting on this what no one has mentioned is that clearing codes from a code reader is not the same as flashing the transmission!

Jaguar has its own proprietary specialized computer diagnostic and maintenance system which is what the dealer uses to deal with all the computers on a jaguar. Just like sometimes home computers have to be rebooted or sometimes even their software reinstalled it’s not impossible that car that has scores of computers (I mean has anyone looked at jaguars electrical diagnostic manuals?!??) might need an occasional reboot.

This is something I recommend you take to a Jaguar dealer or a competent jaguar mechanic who has the proper equipment. Because if a jet pilot here’s the warning from his plane to pull up he’s not just gonna turn off the speaker.

PS: The expense of dealing with a dealer it’s probably cheaper than replacing a transmission.

Hi mc690,

In the years since the OP's first post, I have updated the firmware in quite a few ZF 6HP26 transmissions using Jaguar Land Rover Symptom Driven Diagnotics (JLR SDD) versions 131.03 and 134. As far as I am aware, the latest update available was released in 2006. Along with a fluid and filter change and clearing the adaptations, this update helps smooth harsh gearshifts. As far as I know, it would not solve the OP's issues of failed shifts triggering limp mode.

I do wish the OP would have given us an update to tell us how the issue was resolved, if it ever was.

Cheers,

Don

​​​​​​
So I actually got an email this time telling me that there was a reply to this topic, so here's the low down:

I had SDD the whole time and you're correct that clearing codes is not the same as reflashing, I had originally thought that clearing the adaptations was the same as reflashing but later after digging through SDD I discovered that clearing the adaptations was not the same, as I found the function to actually reflash them:
Which was under Diagnosis -> Drivetrain -> Gearbox and then Extras again which had that option, the car then locks (?) Comes up with gearbox fault on the dash (the car seems to temporarily forget it has a gearbox, very scary when one time it failed and the car continued to forget it had a gearbox) and will take about 20 mins to reflash.
Driving around again the problem stayed, The oil had already been re-done as a first step to try and solve it. I had someone drive the car while I looked at the adaptations as we were driving and it was clear that the car would get to the top end of the gear 3 ratio, then lurch and wouldn't enter gear 4, we also tested this manually by using the manual mode on the gearbox, one time we did mange to get it into gear 4 it made one hell of a noise.
It was taken to an automatic gearbox specialist who said it was 2l low on oil, and that there was likely a serious internal fault, the gearbox cooling lines had been leaking which is likely the cause of this drama. Eventually it was taken to a Jag specialist who replaced the gearbox with a reconditioned one. The car was reflashed again and worked fine for the next few years. The gearbox cooling pipes burst again (hooray...) and have since been replaced, fortunately we avoided any long term effects on the box this time and ever since the car has been fine and is still used to this day.

Hope this helps anyone coming across this