I own a 2016 jaguar XJL portfolio AWD.
yesterday driving home I decided to use the paddle shifters for the first time in almost 2 years.
I had the car in S mode when doing so.
when I got home I turned off the car but must not have shifted it into park. Not really sure to be honest.
this morning when I tried to start the car the lights on the radio and dashboard would come on but the car would not start and the shift knob would not come up.
A sign came on the dashboard saying @press brake when startin. Which of course I did.
The note also said press “OK to clear”. Not really sure what that means.
It doesn’t seem to be a battery issue as the lights come on and the hood is able to open etc.
any thoughts or suggestions as to what to do? ??

 

 

Most likely your brake pedal switch have failed. Car have not detected that the brake pedal have been pressed. You can try to press bit harder. (sometimes brake assistant can lost the remained vacuum charge and pedal need more force when engine is not running)

 

Thanks for the reply Vasara. I put my foot firmly on the break and held it down for well over 10 seconds while pushing the start button.
Still no luck

I find it quite unusual that I’ve had the car for well over two years and the only time this has ever happened is immediately after I used the shifting pedals on the back of the steering wheel.
Maybe I didn’t do something right when I was using them?

 

Use a voltmeter to check the available battery voltage across the terminals with the ignition in the OFF position. There must be a minimum of 12.6 volts available for all modules to function properly.

 

I think you have failed brake pedal switch. Cheap and easy to change. Does your brake lights go on when you press the pedal? Thats not tell the whole thruth, sice the switch have 2 circuits, one for brake lights and one for the system. (search with these part numbers 6W8313480AB / 6W83 13480 AB / 6W83-13480-AB)

I don´t think you could do anything wrong with the padles causing this. Exept one thing: The gear should be either in Park or Neutral for a start, but checking the pic you add, the gear are in P, so thats Ok.

 

I think u may be on to thing regarding that failed brake pedal switch suggestion. The brake pedal is very very firm when I step on it
to start the car. More so than usual.
And of course the gear switch will not pop up unless the car is started. So logic would say that it’s not necessarily a gear switch issue yet at this point?
The car is at home in my garage and I am at the office. I will have my wife test it and find out if the brake light goes on.
I am assuming I will have to have the car flat bedded to the local jaguar dealership.
Hope that is the only issue with it.
You mentioned it may be cheap and easy to change. Any dollar estimate on that?
Thanks and much appreciated!!

 

Just heard back from the wife.
Yes the brake lights do come on when she puts her foot on the brake pedal and hit the start button.
Unfortunately the car still does not start.
The P for “park” is illuminated though.

 

By the way, she did mention that the brake light does NOT light up when she just sits in the car and puts her foot on the break.
It DOES light up however when she puts her foot on the break and then pushes the start button.
Of course the car doesn’t actually start but at least at least that has triggered the process

 

Assuming you're talking about the brake lights on the rear of the car, NOT the BRAKE indication on the dash, that's how it should be.
(The BRAKE indication says the parking brake is engaged)
So your parking brake is set then?

 

I think all cars and light trucks sold in the USA must be able to operate their stop lamps without any ignition, fob or key present. It's a safety thing. My '12 XJ complies with this.
Parnelli, something's amiss. Try Newport Beach's suggestion. If you don't have a voltmeter, use jumper cables from a known-good, running car to ensure adequate voltage to your system. If that doesn't work, I'd disconnect both of your batteries, wait a while, then re-attach.

 

parnelli,

You mentioned that you can't remember putting the gearbox into park when you shut the car down. (The car SHOULD self select to P if you shut down in D). I'm guessing that the gearbox MIGHT not have selected to P completely, and the starting interlocks are still engaged.

Try this;

Open the center console and remove the pen holder. (It clips in, so you may need a trim pry tool)
Locate the red strap, then turn the slotted disc anticlockwise through 180 degrees.
Pull the strap up so the attached arm is vertical.
The car is now in N and should start.
If not, return the arm to its original position and lock it back in place. The gearbox is now in P. Try starting the car again.

You never know, it might work!!

wombat

 

The brake pedal switch are same than used in many other brands, Ford, Jeep, Alfa, Fiat, Chrysler, GM, Dodge... so i believe you local autopart store have them in self for 15-20$ USD (i can see my local prices at 15-20 €uros)
(Google this part nr: K68349583AA)
No tools needed for a change, exept some flashlight are handy (phone will work well) : Move driver seat as far back as it go, Remove liner on top of teh footwell by pulling off 3 or 4 plastic clips and get down on the footwell so you can see up the brake pedal arm. (not the most comftable position) You should see the switch near top of the brake pedal arm what are "pressed" when brake is not applied. Press pedal by hand a bit to take tension off the switch and squeese side clips+rotate the switch. It should turn about 90 degree and then you can pull it off from its bracket. You can now release the brake pedal. Now remove the electrical connector (typically there are release clip to push). Voilá!! Switch are in your hand. Install new one in reverse order. Takes about 15min to change it.

 

wombat-

I will try that when I get home from the office. I actually saw somebody on YouTube suggest that but he said that is only in rear wheel drive cars.
if I remember correctly your car is a 575? That would be RWD.
AWD Drive cars (mine) the switch area is up in the front engine area. And I don’t have the tool to do that

 

When attempting to diagnose any type of fault that includes electrical components, it's always best to begin by verifying the available battery voltage. Anything else is simply guesswork.

Many of the electrical 'gremlins' chased across these forums are the result of a failing or weak battery, which can produce random DTCs and other 'weird' issues.

 

The battery is barely two years old. I bought a brand new one summer of 2021
I was out of town all of last week so the car was not started in about eight days. Typically that’s never been a problem with his car, though.
I started and drove it when we got home on Sunday, drove it on Monday, and drove it on Tuesday. No issues at all.
Wednesday morning it would not start.
So could it be a battery issue? I suppose it could be. But quite frankly it would surprise me.

 

I am having AAA come tomorrow and flatbed it to the Jaguar dealership. Hopefully the AAA guy can do a battery check on it first and maybe even fix it should it be a battery issue.
I am just not mechanically inclined at all and I am limited as to what I can do on it personally

 

That's an interesting idea, and made me test that theory with vehicles I have on hand, to look and see first-hand if it's true:
2012 Jag XJ - YES! They DO come on.
2012 Land Rover Range Rover - NO, no brake lights with no key/ignition
2003 Land Rover Range Rover - NO, like it's younger 2012 sibling
1997 Oldsmobile Aurora - NO, no brake lights without key/ignition
1992 Ford Explorer (Sport) - YES! Wow! The only other one that does light brake lights without key/ in the ignition. Although I've always considered it ahead of it's time, I wouldn't have guessed.
Then the 2-wheelers...
2003 Harley-Davidson Road King - NO
1997 Triumph Trophy - NO

...So hit & miss.

And back to the original description of the problem, I could swear that I've seen somewhere (like the owner's manual or possibly Topix literature) that gave instructions in the event that the shifter knob fails to raise - just can't recall where that was.

 

... I could swear that I've seen somewhere (like the owner's manual or possibly Topix literature) that gave instructions in the event that the shifter knob fails to raise - just can't recall where that was.[/QUOTE]

Found it - to quote from the Topix Drivetrain section titled:
"AUTOMATIC TRANSMISSION/TRANSAXLE EXTERNAL CONTROLS"
"EXTERNAL CONTROLS - SYSTEM OPERATION AND COMPONENT DESCRIPTION"
under the "ROCKING FUNCTION" paragraphs (although it does say when it's running):

 

Hey thanks for that update!
And you are correct, it does say how to fix the gearshift rising issue “when the engine is running”.
Unfortunately my engine isn’t running