I hoping someone can help here! I have recently privately bought a beautiful XJ 3.0 Supercharged and was fine for the first week. Then one evening I tried to start it and it came up with a multitude of error codes at it wouldn’t start.
- Park break fault
- Stability control not available
- Check pedestrian protection system
- Emergency brake assist not available
- Engine temperature indication fault
- Gearbox fault
- Charging system fault
- ASPC not available

All came up at the same time. I have tried to disconnect the battery for 4hrs to reset the system but this didn’t work.

I did manage to get it started and get it home. I turned it off and back on and all the fault codes disappeared. Then the problem happened again and I haven’t managed to restart it since.

The car battery is new and I had it checked a. It’s fine. But all my playing resulted in it draining a bit and so I fully charged it overnight but the problem is still there.

I’m a bit lost now!

 

Was the Battery Management System reset according to procedures when the new battery was installed?

 

I honestly have no idea as the battery was changed before I bought it. Is there a way for me to check?

 

Sounds power issue for me. Even the battery is new, its not sure it could not be faulty or empty.
BMS system learn an battery capasity in time, but its worth on your situtation get it reseted by diagnostic tool.
Removing battery from modern car pretty much resets real time clock, but nothing else. Its like removing battery from laptop.
Checking battery terminals and main cable mounting points is a good step to do as very first step.

Edit: What year your car is? There might be an secondary battery causing an issue.

 

The battery was checked by Halfords and was low on charge but OK.

But it only charges to 13.4V. Should this be higher?

 

Normally charging voltage are around 14.4V for low charge battery. Sounds like your BMS is not aware of your battery status or your alternator is failing.
Most modern diag tools (any garage) can reset BMS module. (Battery Managned System)
Should not cost much and take 10-15min.

 

Thank you very much for your kind help!

 

Bear in mind the ECM/PCM controls the rate of charging along with the Battery Management System.

It's always best to connect an external 12 volt source to the battery terminals whilst removing them to replace the battery.

 

I had the alternator checked and it's fine. But the car doesn't recognise the battery. On capacity & charge the reader (Halfords own one, not mine) stated unknown/invalid. We tried to reset the BMS, but this was unsuccessful.

The voltage was fine, but the current was only 450A and the battery is rated at 850A. Almost certainly because the car doesn't recognise the battery.

Does anyone have any ideas on how to resolve this? Does it need an SDD enabled reader?

 

Absolutely a battery problem, my friend.....These care need a solid 14.4 volts at substantial current flow for the electronics to function.

 

You can try to charge battery with external battery charger and if capasity test (by external tester) still show 450A for 850A battery, the battery is failed. Happens sometimes even new ones.

 

Sorry - only just have seen this. The car is 2016

 

Ok. On 2016 there are no 2nd battery.

 

I just wanted to say a huge thank you to you all. I’m not sure if the issue is fixed yet, but I swapped the same-spec battery from my diesel A6 to the Jag and charged it fully. The car now recognises the battery from Halford’s diagnostics checker, but I haven’t been able to reset the BMS yet as their kit won’t allow it. It has started fine so far with no warning lights, so fingers crossed. Visit to a Jag specialist with an SDD machine next week.

So much knowledge on here and you’re so generous with your time to share it. I’m very grateful.

 

No need. If you read the Jaguar documentation it states the BMS will self calibrate. Thousands of batteries have been changed without resetting the BMS. I never even bother.




Attached is Jaguar's explanation of the BMS system.
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I know the XFs are notorious for bricking their BCM when the battery terminals are removed, requiring a wipe and reflash of the EEPROM and reprogramming from new. Have you ever seen this happen on an X351 model?

 

I am not so sure, I think calibrating is required because at the end of the BMS PDF you uploaded it says so the way I read that, the monitoring system needs to be told there is a new battery to self-calibrate but if a module is replaced, it starts with no calibration so will self-calibrate anyway. As that PDF is from 2012, maybe they changed the BMS so it now self-learns but if that PDF is still accurate some sort of rest procedure is required for the new battery and the Jaguar specialist will be able to do that.

 

Not directly related but might be useful, in the boot on the right side carpet panel there is a cover for charging port (the small cigarette lighter size) in my 2017 XJ, you might have the same. I could not find it mentioned in the handbook but found some info on it somewhere and what it could be used for. As I do not drive my car as much as I should, I connect my Ctek mx5.0 battery maintainer to it, I am pretty certain this charges via the BMS so it know what is going on, I can tell the difference when I come to start it if it has been on charge, engine spins just that bit quicker and no odd messages due to low battery. I have also driven off once with it still connected mind