99 jag xk8. I get stability control fault, car

When the system goes into to Limp Home mode it means that a serious fault has occurred in the electronics or a mechanical failure has been sensed. What you need to do now is have the computer control system scanned for fault codes, this (the fault codes) will give you a starting point to diagnose the problem that has caused the Limp Home mode to be initiated by the computer control module.

Having a restoration shop and running several newer Jaguars I have seen similar situations. Intermittent multiple errors such as these can be caused by a low battery (or corroded connections) that "fool the computers". Also had a '99 XJ8 VDP have exactly the same issues over several months. Issue was a manufacturing fault in the sensors on the throttle body that caused the "limp home" mode - usually in stop and go traffic. Jaguar had an inspection and recall on the throttle bodies but that vehicle had gone through 3 different Jaguar dealers for service and none looked at TSB/Recall or performed the necessary checks on the throttle body. Tried cleaning the throttle several times (per Jaguar TSBs) but no change. Had to replace throttle body & problem solved (over 30,000 miles since then). Recommend making sure all air connections to throttle are clean and open and cleaning the throttle area to see if that helps.

On newer Jaguars (and other Al bodied cars) similar problems occur when the "ground" connections to the body become poor (usually through corrosion but sometimes through collisions). Connections may look perfectly normal but have high resistance. Careful when working with the connections - the posts are usually very loosely fastened to the bodies. Good luck.

ASC is short for "automatic stability control" u will need to have the ABS/Traction control system tested by the dealer for a possiable fault code.

Seems likely it is just a transmission cable adjustment needed. Please see my whole note (not a musical whole note) above under Clarification...

I'd go to this site and read the info... http://www.europeantransmissions.com/Bulletin/DTC-jag/Jag/307-01.pdf

Best regards, Michael

have the guy to put a new battery on the car then try it.I would not buy it if he is not prepared to do that for you.The car only goes int limp mode if you have a bad fault.I doubt its the battery i haven't come across this before just because you have a flat battery

This code is an indication that the transmission has excessive slippage, the code is for the input and output turbine speed sensors, based on what i know of this problem the trans has a mechanical problem, that would be low fluid pressure or worn out forward clutches, make sure the trans fluid is not low, if it is ok you will need to have the trans torn down for inspection..

Just a quick mention - for about a month my XK8 low coolant light came on intermittently. This week with no notice while driving normally I got Stability Control Fail and FailSafe Engine Mode and wtih great difficulty got the car back to where I started from (less than a mile). Two days later (when got time) and after a bit of research, I tried it again - same problem and a very unhappy engine. I then disconnected the battery for 15 minutes (probably more) to clear the engine codes as well as check all the wiring and vacuum stuff I could under the hood (at a Jaguar master mechanic's recommendation). No problems found but the car would start and immediately stall with the air intake hose disconnected from the intake butterfly. After I reconnected the air intake hose, she started and purred like normal. The problem is the BATTERY... It is low - I've known it for a LONG time BUT it always started right up and never skipped a beat. I intend to replace it tonight but fully expect that's the issue. I've had the car 6 years (it's a 98) and had NO problems except a dead taillight asembly.

Hope this is of value...

look at your wheel speed sensors in the back ( this is where I would start)

Hi

Sounds like usual gremlins kicked in to your computer, with the flat battery.

Disconnect both terminals of the battery, switch on the ignition to start position 6 times, to clear the computer memory.

Reconnect Positive terminal + then Negative --- and start engine, and check it out.

I am pretty sure it will not come back on.

Also I suggest you get the battery tested soon as possible.

( Is it the original battery ?) If so, its shot !

Good Luck !

Please give me a FixYa rating please !

Let me know how you get on .

John.

this can be caused by a few things. Diagnostic Trouble codes needed to diagnose. many auto part store will read codes for free, please post codes