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Discussion Starter · #1 ·
Hi All!

Just picked up a 2010 XF PL 3.0D, 130k. Its barely done any mileage for the past 3 years and been sat for extended periods of time. Previous owner did have to replace the battery recently but its a fairly cheap lead acid, not an AGM one - although dont know if this is needed as its not a stop/start car.

Everything was absolutely fine on the test drive and inspection but when I picked it up a few days later the screen was constantly rebooting and freezing. Now it doesnt start at all, sometimes hangs on the jaguar logo, most of the time stays black. I've replaced the bluetooth module with no joy. Also bypassed both modules under the seat and the satnav in the boot with MOST loops, still doesnt fire up even after leaving the battery disconnected for an hour. So I'm assuming it can only be the main head unit so I've ordered a new complete screen and head unit set.

More worryingly was sitting on a dual carriageway at 70mph last night, it flashes up with "gearbox fault" in orange, D on the selector flashes and it went into neutral (engine was revving freely). Coast to the side of the road. No other faults shown, just that. Restart the car and after a couple of lumpy changes its OK. 10 mins later it does the same thing again, slowing down to a junction from 40.

It's already booked into a Jag specialist locally on thursday next week but wanted to see if anyone had encountered anything similar before? My gut is telling me its the cheap battery, possibly one thats been left to go flat a few times. The only time the screen has booted up without hassle is when I left it connected to my charger/conditioner for a few hours - worked for a few drives after that but failed again pretty quiockly. The gearbox fault occured on one of the first drives I've done with it after servicing it - oil (correct spec, checked level all fine), oil filter, air filter and fuel filter. I cant see how that would cause a gearbox issue though so probably a coincidence.

Any thoughts on whether I'm looking at a huge bill or am I possibly on the money with the battery being the root of both issues? Its showing 12.2 and 14.4V when the car is running so voltages seem OK from a basic test..
 

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Discussion Starter · #3 ·
Ah interesting. I’m going to guess because it’s been sat for so long it’s discharged completely which can ruin lead acids.

The other thing I’ve had is intermittent low key battery warnings despite having a new battery in the key - which I’ve read can be related to the vehicle battery too. Also very occasionally get a red battery symbol on the display for about half second after starting.

Will let the specialists confirm and supply a suitable new one, quite happy to throw the keys at them and take it back with everything working and the car having had a proper once over. Just good to know it’s not a definite sign of needing a new gearbox!
 

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These cars are extremely sensitive to low battery issues and a poor battery throws up all sorts of warnings and 'gearbox fault' is one of them. They also need to be run and not left to be sat for extended periods. No need to panic just yet, let your Jag guy give it the once over, fit a decent battery and give it a good run. Report back and let us know how you get on.
 

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Discussion Starter · #5 ·
Thanks again, I’m panicking much less now! Hoping I’ll get it back after Thursday with a nice new battery, everything working, a clean bill of health and a not too massive bill to pay!
 

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Discussion Starter · #7 ·
This was a while ago but can update!

The electrical issue was a failed alternator which wiped out the nearly new battery, so needed both alternator and battery

The screen issue was the integrated audio module (head unit/cd player) which proved time consuming to diagnose but cheap to fix

The gearbox behaved fine after a service for a month or so then started doing it again. Fault codes suggested slippage in the internal clutches, likely caused by not being serviced before, so new (low mileage second hand) gearbox was fitted.

Shortly after that, I started getting RP issues caused by a sticking secondary turbo actuator.... thats when I decided to cut my losses and part ways with it.

It did get replaced with a 2013 facelift sportbrake. Much newer, low mileage (65k) and a higher trim (PL from L) - which has been absolutely wonderful, albeit a bit more expensive to buy! Only issue in the month or so I've had that was a sticking door lock which was replaced under warranty.
 
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