[OPetrides]

Hi all, I am new here and first post incoming.

I bought a 2019 I-Pace in November 2022 in the UK and have loved it so far however I seem to be having the same issue as so many other pre 2020 users with the 12v battery and the aux battery not charging successfully.

2 months after buying this car I came down to it totally dead, no power whatsoever. Luckily I had the last few weeks of warrantee left and Jaguar assist came out and powered up the 12v battery and completed a huge number of updates including those that it required to keep the 12v battery charged. After a few hours he assured me it was all up and running.

All good until fast forward to last weekend, almost 2 months later, I came out to the car with the dreaded P flashing sign and 'Traction Battery Fault' with no ability to start the car and all the usual signs that I have seen so many times on this forum. I am now 2 months out of warrantee. I must admit, the days leading up to this, I had cleared the 'brake pedal feel reduced, Ok to drive' message which I now know is a mistake. The 12v battery has charge, in fact it seems like it is overcharged from the numbers that came out, 12.35v I think? From research I am assuming that the Aux battery is the issue or some sort of software issue that is preventing the Aux battery from charging.

I have spoken to Jaguar dealer and they say that if it is a similar issue to what the assist guy 'fixed' in January then any problems will be covered under warrantee but if it is something else then the diagnostics will cost between £216 - £432..... just to tell me what is wrong, let alone start fixing it.

First things first I am going to get my local garage to check the functioning of the aux battery to see if that is the issue (seems like these things have a 3 year end life, which makes sense) or if it is ok, it is another software issue that no doubt will need a Jaguar dealer to have a look at. I am assuming I cant run these sort of updates over the inbuilt software update system?

I would be interested to hear peoples thoughts on this and whether I have a good argument with Jaguar that it is a similar issue to what should have been fixed before?

Thanks

 

[Ayepace]

If it isn't the small auxiliary battery then it could be the broken wiring harness issue that was a recall in the UK. Do you know if that recall was done? A Jaguar dealer or Jaguar Customer Service should be able to look up this info as it should be recorded in their service records for the car.

The small battery costs around £60 in the UK from various sources.

If it is neither of these, then there is another fault in the high voltage system that has to be diagnosed.

 

[OPetrides]

If it isn't the small auxiliary battery then it could be the broken wiring harness issue that was a recall in the UK. Do you know if that recall was done? A Jaguar dealer or Jaguar Customer Service should be able to look up this info as it should be recorded in their service records for the car.

The small battery costs around £60 in the UK from various sources.

If it is neither of these, then there is another fault in the high voltage system that has to be diagnosed.

Hi, thank you for your response. My local garage has tried jumping the Aux battery with no luck. I have spoken to the dealership about the recall and they cannot confirm that the recall was done as it wasn't with their chain of dealerships, but they did say there is no outstanding recalls on the car. They could give me no other direction to find a definitive answer to see if the recall was made.
I have had to send it to the dealership this afternoon and they will run the diagnostics to find out anything further, I am going to make it known that this should have been sorted with the first call out and if that fails then argue it is a clear known fault within the car so soon outside the warrantee period should be honoured.
I can't believe how many people have had this issue.

 

[OPetrides]

Hi, thank you for your response. My local garage has tried jumping the Aux battery with no luck. I have spoken to the dealership about the recall and they cannot confirm that the recall was done as it wasn't with their chain of dealerships, but they did say there is no outstanding recalls on the car. They could give me no other direction to find a definitive answer to see if the recall was made.
I have had to send it to the dealership this afternoon and they will run the diagnostics to find out anything further, I am going to make it known that this should have been sorted with the first call out and if that fails then argue it is a clear known fault within the car so soon outside the warrantee period should be honoured.
I can't believe how many people have had this issue.

So Jaguar have now come back to say it is a faulty 12v battery with a total cost of £800 to repair. Spoke to my local garage, who can do it for £180 but cannot do any sort of configuration regarding software once the replacement has been made.

 

[Pollo de muerte]

There have been a number of posters who have replaced their own 12v batteries and the car will act up a little (e.g., steering wheel controls may not light up or respond) for a few restarts, but it clears itself after a few restarts.

Was the dealer able to confirm that all software updates have been applied?

 

[OPetrides]

There have been a number of posters who have replaced their own 12v batteries and the car will act up a little (e.g., steering wheel controls may not light up or respond) for a few restarts, but it clears itself after a few restarts.

Was the dealer able to confirm that all software updates have been applied?

Thank you for this. The dealer claims all software updates have been applied. They have said the 12v battery is showing at 2.01 volts so needs to be replaced, however 7 days ago when the car initially broke down the breakdown recovery service measured the battery at 12.3 volts.

Is that drop off to be expected? Even if so, the 12v battery was fully charged when it broke down which really doesn't make sense to me.

 

[Pollo de muerte]

There are a number of factors here ... how is the voltage being measured (the car's diagnostic reading or individual voltmeters ... how long was the car sitting when it gave a low reading ... etc. The bottom line is that (a) at the first sign of trouble, the shared wisdom is to immediately replace the 12v batteries and (b) there is no requirement to use the dealer unless it is under warranty and you want a free battery.

 

[OPetrides]

There are a number of factors here ... how is the voltage being measured (the car's diagnostic reading or individual voltmeters ... how long was the car sitting when it gave a low reading ... etc. The bottom line is that (a) at the first sign of trouble, the shared wisdom is to immediately replace the 12v batteries and (b) there is no requirement to use the dealer unless it is under warranty and you want a free battery.

The voltage by the recovery service was initially measured via an individual voltmeter which showed 12.3 volts and he deemed that not to be the problem (I am aware he is not a Jaguar specialist). The car has been sitting for 7 days (because it won't start) which is when the low reading has been given.

Thank you for your comments regarding the requirement to use the dealer. So from what you are saying, there doesn't seem to be any configuration that needs to be done afterwards to ensure proper functioning, apart from a few blips.

 

[Pollo de muerte]

Most have reported that the blips clear themselves after a few restarts.

 

[Ayepace]

I have seen 12v batteries measure good (by voltage) if measured shortly after a charging attempt but will measure as bad if they are left sitting for a period of time. A capacity/load test probably would show it bad at any time.

BTW, 12v batteries don't really measure as 12 volts. A perfectly good new one is closer to 12.8-13 volts.

£800 is too much for a battery test and replacement. What else does it include?

 

[OPetrides]

I have seen 12v batteries measure good (by voltage) if measured shortly after a charging attempt but will measure as bad if they are left sitting for a period of time. A capacity/load test probably would show it bad at any time.

BTW, 12v batteries don't really measure as 12 volts. A perfectly good new one is closer to 12.8-13 volts.

£800 is too much for a battery test and replacement. What else does it include?

So it has been charged to full about 12 hours prior using my home 7kW charger and I had driven 30 or so miles that day. Stopped at the pub for some food and 2 hours later wouldn't turn it on.

That price includes the diagnostic test to find out that it is the 12v battery causing the issue. They also charge £216 per hour of work.

 

[Topdown500]

If the battery is faulty get your local guy to replace it. After it is replaced and if it goes flat again you need the dealer to work out why it is not being charged or being drained.

 

[johnpaton6954]

Thank you for this. The dealer claims all software updates have been applied. They have said the 12v battery is showing at 2.01 volts so needs to be replaced, however 7 days ago when the car initially broke down the breakdown recovery service measured the battery at 12.3 volts.

Is that drop off to be expected? Even if so, the 12v battery was fully charged when it broke down which really doesn't make sense to me.

My

 

[johnpaton6954]

My auxillary battery failed and I checked the voltage it was 6 and a little while it read 12v so had it replaced and kept the old faulty one and that’s what it did on the bench 6v and put a heavy 50 watt load on it dropped to millivolts but after around 30 minutes the volts shot up to 12v very strange but did the same thing the next day, a very dud faulty battery never seen that sort of performance in 40 years dealing with batteries.

 

[Trielectric]

When you check a 12 volt battery voltage, ensure the car is off & ensure the head lights are on & brake pedal is depressed, when you last turned it off. (still no guarantee the car isn't trying to charge the battery when the car is off.)

 

[rcomeau]

So it has been charged to full about 12 hours prior using my home 7kW charger and I had driven 30 or so miles that day. Stopped at the pub for some food and 2 hours later wouldn't turn it on.

That price includes the diagnostic test to find out that it is the 12v battery causing the issue. They also charge £216 per hour of work.

"So it has been charged to full about 12 hours prior using my home 7kW charger": So you charged the traction HV battery. That does not mean anything was done to the 12v battery (or the aux). There is a DC-DC converter (and logic manager circuit) that decides when to change the 12V and aux 12v battery regardless of the state of the traction battery.

 

[Ayepace]

My 12V battery monitors show that they get a charging voltage applied to them for the duration of all HV battery charging.

Technically it is the BCM/GWM that decides when to charge the 12V batteries but that is when the car is shutdown and no HV battery charging is occurring. It will command on the DC-DC converter and PSDB as needed for charging the 12v batteries.

 

[OPetrides]

Update. Jaguar have now said the following:

‘There is two 12v batteries on the vehicle the wake up battery which we tested at 12.07v and there is the aux battery which measured 2.01 volts. Expect to see 12.60volts. This needs replacing and this will cause issues with communication and modules. Once the battery has been replaced we can continue with investigations. This may need more time and parts etc.’

It sounds like they know there are more problems that may be ahead even with a change in aux battery.

 

[rcomeau]

Update. Jaguar have now said the following:

‘There is two 12v batteries on the vehicle the wake up battery which we tested at 12.07v and there is the aux battery which measured 2.01 volts. Expect to see 12.60volts. This needs replacing and this will cause issues with communication and modules. Once the battery has been replaced we can continue with investigations. This may need more time and parts etc.’

It sounds like they know there are more problems that may be ahead even with a change in aux battery.

They need to replace the battery to then see if the battery failed due to age, or if the management of the battery (BCM/GWM as Ayepace pointed out) has an issue.