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Cake

Hi Phil, the first thing required is more information, particularly any stored fault codes that could point to the problem. You have listed your XJ as a 2012 model, therefore an X-351 model, so it should be worthy of a fix, but first we need to know what is causing the limp home mode. N6 JMX

Hi New member here (Phil) bought XJ 1st June 2014 and today (3rd) started going into limpmode can this fault be cured or will it persist from now on. Or, should I take it back to garage for refund. Thanks

You're correct if the car has the correct battery fitted which could in fact be part of the problem. If someone has previously changed the battery and not fitted an AGM battery, the stop-start will hammer the life out of a standard lead-acid and cause excess sulphation, drastically reducing the capacity of the battery. However, if the battery is fully charged and not even the interior or hazard lights will work, it's pointing towards an earthing problem somewhere, rather than fuses. That said, it could be a duff battery and an earthing problem..............

Christmas

Hi Guys The alarm on my 05 3ltr V6 has started to sound for some reason, it's the sounder that's in the engine bay on the driver's side. I've had to disconnect the battery to silence it so getting it somewhere is a problem, plus I have a misfire on cyl 5 and it's booked in for that to be be looked next week as well as its annual MOT. Any ideas as to the problem and possible solution please? Thanks

I assume you are using a suitable charger for the battery? Your battery is NOT a standard lead acid, but an AGM (Absorbent Glass Mat) and should never be charged using a standard style charger. It must be charged by a charger with an AGM setting. The AGM battery has a very different charging cycle and has different internals. The fact that you sometimes get interior lights and ignition, would indicate that the battery can deliver a small level of current but not cranking the car would be a sign that the battery is past it's prime. If the battery has a Jaguar sticker on it, it could well be the original and therefore at least 9 years old, which is well past the use by date for a battery in a modern vehicle - 5 years would be more typical these days with all of the onboard electronics. You certainly need to have the battery drop tested to confirm it's condition, but even then, I would suspect it to be dead - especially if charged incorrectly. N6 JMX

Probably put it on Pistonheads or similar, with a very detailed advert providing all of the information and as many good quality photos as you can upload ? I would include pictures and details of invoices for work carried out, especially any modifications. Most Jaguar forums also have 'cars for sale' sections for members, not as much traffic as the 'usual' advertising websites but less likely to get messers and wannabe test pilots. You will also need to be realistic about your pricing, it is very rare to see much of a return on the money you have spent on modifying the car (as I know from my Subaru tuning days) The XFR is a specialised car that only appeals to a small target audience, modified ones have an even smaller pool of potential buyers. In the current climate, they are perceived to be expensive to tax and fuel, and modified cars can be difficult and expensive to insure.

How soon after taking it off charge did you test that voltage? That could still be a dead battery.

Hi I would start by checking the Mega fuses. I think they are located on the side of the boot above the battery. Try following the Positive lead from the battery and you should find them. John

You must check all connections ???

its the Battery it Sounds as though it hasn't been used in a while ???

I’ve no idea of the age of the battery I’ve only had the car just over a year

Hi again after the battery was on charge all day it was testing at 14.4v, my stop start was working before this all started so Im thinking the batterys are in good health. After fitting the battery to the car this afternoon after being on charge all day nothing happened couldn't get an interior light to come on or even the hazards absolutely nothing dead.

Merry

I bought S-type 2003 that wasn't running. I've never seen soooo many codes. Guy i bought it from wasn't mechanical inclined and never took it to a shop. Won't start, where do i start?

I agree with Dave and I think its a battery problem ???? How old is the battery ???

I'd strongly advise getting the battery drop-tested by your local auto-electrician. That's showing about 60% charge at 12.4V, i would expect more to be honest if it hadn't turned over. This suggests the battery has lost its capacity to deliver current but the only way of doing it is to either get it drop-tested or measure the voltage while trying to start.

This was after we removed the battery and the car was acting dead. Never tested it when trying to start it. Thanks for the reply

At what point did you measure the 12.4V on the battery? When you first took it off the car or what? Also have you measured the battery voltage while trying to start?

Hi my jaguar keeps acting like it’s got a flat battery. I parked up the other day and when I came back it was flat then 5 mins later started no problem. Then yesterday it done the same thing but this time it never came back to life we have tried a booster pack on it and it will only try to start when u put it in boost mode u get a couple of turns then flat again. Thinking the battery is flat we have took it off and put it on charge but it had 12.4v in it when I put a multimeter on it so I’m confused. The battery terminals are tight I’ve checked both bcm’s the one in the boot and drivers side footwell for water damage but can’t see any I’ve not took the plugs out and looked at them yet that’s my next plan and the starter motor cable for corrosion. Any help would be much appreciated as I’m lost now.

My F Pace has done 42,000 miles. Turbo gone. I recently changed rear tyres and wondered why one was more worn than the other. Jaguar had fitted different tyres on rear!

A few things come to mind, first is what fluid did they use in the gearbox? Second, what condition is the battery in? If the battery is not holding its charge that well, it can cause spurious faults on the gearbox ECU and other ECUs as well. The clue here is that it happens after a cold start, when there has been the most load on the battery to start it. By the time you've started it for the third time in the day, the battery would (or at least should) have enough charge to cope with a warm start without dropping the voltage enough to cause a spurious fault. As you might guess, my thoughts are directed at the battery being at fault here! Recently on my S Type, i hadn't used it for about 3 weeks and when i started, it came up with "Auto Gearbox Fault". I ignored it for a few miles, then hit the clear button and it went off and stayed off - hasn't returned since so i'm assuming that it was just a low battery. Sometimes it will also try and tell me a tail or brake lamp (sometimes both on both sides!) have failed as well if i haven't used it for a couple of weeks.

My apologies for not answering your question. I decided to just leave it at the time and of course now that its getting warmer I am regretting that decision lol. I will update on this if I get it done this year. Using the car a lot less at the moment so I can do most journeys with an open window.

Thank you Trevor for finding this out. I was thinking that it probably had more to do with my inept computer skills. I did find it and am just about to attach an update to it. Many thanks and my sincerest apologies for casting any doubt as to the running of this page