I have a 06 jaguar s-type that vent it to limp mode while at a stoplight twice and I turned it off and restarted it and it was fine. The next day I woke up and started the car it went into limp mode and stay in that mode permanently. I replaced the throttle body, accelerator pedal, spark plugs, fuel filter, checked fuel pressure, checked battery voltage, replaced brake light switch, checked for air leaks and it still goes into limp mode. I even have the jlr software and still can't figure it out.

 

that is really odd.

Have you tried checking for/pulling the codes to see even if the light isn't on, what codes your car is throwing?

The Jaguar also has pending codes sometimes that you can look at.

 

B1262, B1263, B1242, also I have program software that reading steering angle at stuck at -800 idk how when it only goes to 360, steering makes noise when turned.

 

What are the descriptions of those codes according to SDD?

Because they seem unrelated to your problems...

B1262: Climate Control Defrost mode actuator motor drive circuit fault
B1263: Climate Control Panel mode actuator motor drive circuit fault
B1242: Climate Control Fresh / recirculation air flow actuator motor drive circuit fault

?

 

Dame description, and I datalogged them and they seem to work fine

 

And no other codes at all?

What messages are you getting on the dashboard? Any coloured lights?

How about some pictures or a video of what you see?

 

No light special lights or anything everything seems fine minus what I have describe an I can post pics

 

So how do you know it's limp mode then? And how did you decide to throw so many parts at it without having any codes or error messages?

This doesn't make any sense.

 

Makes alot of sense since these cars don't always throw codes for intermittent bad parts. You see I have no codes for steering angle sensor and clearly something was wrong in that system. Also one of the Vehicle ecm scan said throttle induce limp mode then gave me a bunch of reading I should've taken a picture of it, I can tomorrow. Also my pedal was out of spec but still working, took ohm reading and pedal position readings but it's still wasn't the cause.

 

Also the car start fine but when it start getting to 2000 rpm it switches gears then looses power and rpm won't go beyond 1000 or won't drive more then 10 to 15 miles after it looses power. I also have a manual that tells me those symptoms plus if you read enough thread on here

 

Let's go back a few steps.

You said you have the JLR software. Which version? Which interface? (genuine or clone)

On the opening screen with SDD you get any overview of the module communication, and you will see green ticks, question marks or red crosses at each module.

What do you see there?

 

I have Verdon 139 genuine, 143 genuine and I have a copy of 130 I got off here lol, I'm not home to look at the modules but I can look tomorrow it has a exclamation point by the module for the ac, and they had some question mark on some other things, mostly that weren't install on my car

 

Bad battery / power? Check with DVOM at various points with engine off after standing overnight. Then again with engine running.

 

All your problems sound like electrical faults. Look for water or burnt cables in the wiring harnesses. There is no way all those individual faults just randomly happened all of a sudden. They are all related somehow. You may have blown your computer since it is showing so many electrical related problems.