I haven't brought this up before but I was wondering if anyone has had their XJ's shut down while driving them? I mean shut down while your foot is on the gas traveling down the road? In the three years or so that I've owned the car it has only happened 4 or 5 times. A warning pops up and says please restart the engine! Once I put my foot on the brake and hit the start button it does restart and goes along it's merry way! Of course you can't get something like this to replicate itself when you take it in to dealer and my dealer says he's never heard of this. Anybody else????

 

Has never happened to me. I would be worried if it was to shut down at the wrong time.

 

Have you reported this to the federal government? If not, why not?

 

Have you been able to observe any patterns when the car shuts off? Is you foot on the gas pedal or is it off?

It is definitely disconcerting and I would not settle for the dealer's service brushing you off. I used to be a technical specialist and most hard to explain issues tended to evoke the very same response from the manufacturers:

"We've never heard of this before." - even while they were busy working on the fix for the issue they never heard of.

Doubt those kind of answers. A car shutting off randomly while being driven creates a potentially dangerous scenario. None of my 5 late Jags ever shut off during driving. Decades back I had a Plymouth Fury that did exactly that and it turned out to be an intermittent wiring harness connection.

 

The service manager did seem concerned about it and did report it to Jaguar. Nothing came of it. I can't believe my car is the only one that does this albeit infrequently as it is.
The worst time was going down I-95 at 75 mph and kaput! Rotary dial retracts..... Stuck my foot on the brake and hit the start button and away she went while still cruising at around 65 mph! What's curious is that an actual warning came up on the dash telling me to restart the car almost like Jaguar was prepared for something like this.......

 

May be something like a faulty ignition switch or contact and the car thinks YOU turned off the engine but wants you not to do that.

Never heard of this before on these cars.

May be a chafed harness.

Just wants diagnosing & fixing but doesn't appear a design fault let alone a known issue.

 

My wife was driving our 2006 XJ when it happened. I was in the passenger seat, which was very fortuitous, because she nearly had a heart attack.


It wasn't a complete shutdown, or there wouldn't have been any power steering or power brakes. We were moving about 75 mph at the time.
We pulled over to the berm, but we didn't get any message. Not knowing what else to do, we did shut off the engine and waited a bit before restarting. It started right up and we continued the rest of our journey (an additional 300 miles) without turning off the car, even when stopping for fuel.


The next day I got it to the dealer and was told that this was a safety feature and that one of the engine control systems had probably failed and forced the car into a "limp home mode". However, they never found the problem (or, didn't tell me what it was) and it never happened again.


It actually was very frightening.


On page 93 of my 2013 XJ's manual, there is reference to a "Limp Home Mode", but not a lot of detail.


Luck
King Fala

 

exactly same has happend to me not once a few times now i thought it was battery as batery died and i replaced now got a new one with 5 years warrenty and yesterday while driving to lake district it happend again only once wife was driving car came back on right away i had to take it out of driving to neutral then back in driving and then it carried on driving its not safe at all jaguar needs to do someting about it before something major happens to someone. Clearly some engines have fault and need to be called back

 

On the contrary: your car has a fault. It is vanishingly rare and every time has been a fault that has occurred after many years without the fault. (Actually, on at least one occasion it was driver error - knee hitting the key, switching the engine off.)

Your best bet is to find someone competent who can diagnose what is wrong. It's nothing to do with the car design or Jaguar.

 

It would probably help if someone could delve into the software for this year and model and list the specific(s) that trigger this error message. Another clue might be to try and duplicate this by driving on a deserted road and switching the engine Off while underway. Does the same message appear?
There are inexpensive analytic tools that provide real-time recording of many drivetrain parameters. They typically employ a smartphone or tablet and an OBD2 dongle. I would think Jaguar USA would offer to provide such a recording device. Conversely, you might consider a dashcam positioned on the headliner behind you to capture the instrument cluster and view out the windshield. Any attorney in America that can spell "class" and "action" would salivate at the prospect of representing owners of vehicles that exhibit this serious malfunction.

Personally, I would not own an automobile that suffered this type of fault more than once.

 

I think you'll find the car already stores the kind of data asked for above (can be read using dealer tool).

 

Reading through this thread, and consequently your post, I recall something similar, happening to our former 2009 XF........

 

Limp home mode doesn't shut off the engine completely - it just restricts the power and top speed. So the Dealership was talking through its hat, especially claiming that the engine shutting off while you are motoring is a "safety feature". In what possible universe can that be a safety feature?