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Battery Warranty and High Voltage Connector Corrosions

1.8K views 30 replies 10 participants last post by  allott333  
#1 ·
Hi All this is my first post as a newish I Pace owner.
I purchased a late 2019 I Pace in May from an independent dealer in Winchester.
A week into the ownership I had the Traction Battery Fault that I quickly learned is not too uncommon.

The dealer advised me to take it the Jag dealership to diagnose the fault and it should be fixed under warranty.
I had a single module that needed to be replaced.
It finally went into Marshall Jaguar Oxford on Monday 1st Sept for the module replacement.
Thursday afternoon I had a call from the service department to say they had noticed Discolouration from Copper to Dull Grey/Corrosion, Heat damage and Signs of Arcing on the High Voltage connectors.
Explaining these are not part of the battery! But they would need to remove two battery modules to gain access and replace.
While not a failure now these could become an issue for the future!!!
First quote he gave was around ÂŁ1000 with 4X packs of thermal paste that sit under the modules at ÂŁ75 each and two Connectors at ÂŁ100 each plus an hours labour.

On Friday morning a went into the dealership to gain a better understanding of the issue and the location of the connectors.

These two connectors are on the front face of the battery
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and showed me an example of the connectors removed from another battery with the same issue.
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The technician had been referring to the outer connections of the connector that carry no current and serve to ground the outer braid of the high voltage cables to the chassis of the battery.
The corrosion is from water ingress past the outer seal between the body of the connector and the battery chassis.
This corrosion flaked off with my nail and exposed the still silver plating underneath.
I'm now thinking this would be salt crystal formation from salty winter rain water?

The service guy then took me to see the technician and my battery, He then showed me the rear of my connectors with a bore scope.
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As part of the battery module change the technicians are told to inspect for this corrosion and showed me the service bulletin with JLR's recommendation to change the connectors if found.
The technician also explained the procedure to remove the two battery modules and old thermal paste removal.....
This would need around four hours labour and not the one hour the service guy had thought!!!

This then followed me to question how is this connector seal failure and water ingress not covered under the battery warranty and why are you expecting me to stump up the now ÂŁ1700 quote for the fix.

The service guy explained the battery warranty only covers the individual modules as all the individual parts within the battery are available parts and can be replaced as needed?

As it stands for the moment:
I called the dealer in Winchester who I purchased the car from to see if they would contribute to any cost.
They advised me to ask for a good will gesture from Jaguar that Marshall can ask for to bring the price down.
Marshall's have said this they can do on Wednesday if the JLR IT system is back up and working.

I have been looking over the weekend for information on what is and isn't covered in the battery warranty and all I can find is the reassurance in brochures and Jaguar website about the 70% degradation and how they will fix any manufacturing defect free of charge.
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Has anyone else had the high voltage connectors replaced and if so did this cost you anything.

I will be challenging this further next week with Marshall's and JLR if I can get in touch with anyone.
I'm fortunate to work with ex Audi and Porsche master technicians and I'm an electrical engineer in a vehicle engineering department.
So have a good knowledge about automotive connectors wiring.
Fingers crossed.

At the moment my car is up and ramp with my battery on the only battery trolley blocking any other EV work from being done.
I also have a brand new 75 Plate Evoque they have loaned me, So hope this will be an incentive to get this resolved ASAP.

Sorry for the long post
 
#2 · (Edited)
#3 ·
As you have only had the car since May it Is the responsibility of the selling garage to fix any issues, irrespective of any warranty, under the Consumer Rights Act. They have 1 chance to fix it then you have a right to reject. Ask them to do all the running around.
 
#4 ·
There is certainly no shortage of threads on here on the subject of the battery warranty, including much confusion about what the 8 year/100000mile battery warranty does and does not cover.

These EV battery warranties, that seem to be a fairly standard coverage across all EV manufacturers, were introduced following governments’ pressure to allay consumers’ fears over battery longevity. The marketing puff in the sales brochure extract you site above is not consistent with what is covered in the formal literature that comes with the car, which limits the guarantee to a performance based metric only. This has given rise to a lot of confusion, and crucially, several rejections of failed component claims under the battery warranty.

That said, recently, as @Pacey mentions there is apparently a new clarification of the battery warranty terms that would now include battery components. I say apparently, as I haven’t access to read the document, but the title looks encouraging!

On the subject of warranty, your battery warranty has nothing whatsoever to do with your module replacement as these were covered by a safety recall.
 
#6 ·
Thank you to all that have replied.
Update on the post
On Monday I spoke with the Marshall's service person and repeated my feeling regarding the warranty and how I could find no documents to say what is and isn't covered.
He gave me a Jaguar phone number to call. 0370 5000 500

The person I spoke to listened to my complaint and the expectation to pay for the replacement of the connectors and the not so great customer experience.
She tried to call the Service Manager at Marshall's while I got put on hold, But she couldn't get in contact anyone!
The lady then said she would message the Service Manager and look into details regarding the warranty and I should hopefully receive a call back from Marshall's Service Manager.

Today I did get a call from the service person I had been dealing with at Marshall's.
Who said there had been some contact back and forth with Jaguar this morning and had received a warranty update that as of August 2025 the Connectors are covered under the battery warranty.
He seemed relieved at this news and expressed how lucky I had been to fall within this new time period!

So a good result to share with you all, if in the future you are also in this position.
I'm still annoyed but not surprised by Marshall's stance on this and in no way tried to advocate for the customer.

I will try to find out what I can regarding the battery warranty as Jaguar's Battery Promise to its consumers is not worth much!
 
#8 ·
Are you on the JLR approved warranty ot Marshall variant also a car care plan offering.

Of course you are getting coverage it seems under the 8yr warranty which is a performance warranty.

The question is whether the extended warranty would have covered it (reports mixed on some area in the region).

Then it gets further confused with safety related recalls around charge limit which aren't any form of warranty.

It can be tough.

Any problems exercise your right of rejection given it's under 6 month. That will focus Marshalls mind.

Hopefully all solved now though.
 
#16 ·
That's great news.
I bought mine at the end of last month and it's been with the dealership until the 18th getting a replacement windscreen fitted and I went on holiday the next day so it hasn't had much use yet.
I must say that I have it on good authority from the previous owner who contacted me on here that it's a good one but after reading the issues that can be had it can be a little daunting.
 
#17 ·
Hi Guys, I am new to the forum and have very little knowledge of EV vehicles, but hope someone on here will be kind enough to help.
My wifes 2019 Ipace has had all the issues listed above, In Jan 2025 it went in to have traction battery issues sorted which was covered under warranty. All was fine after until 6-8 weeks age when the car wouldnt charge, either on fast charge or normal 7KW home, the traction battery message also appeared again. We took the car in and they said the actuator on the charging port was broken. This was replaced for ÂŁ380. The following day the "High voltage warning" message started illuminating. We could not get the vehicle to charge. It went back to the dealer and they said they could not find a fault and it charged using their super charger. I questioned why the high voltage light came on so soon after they had undertken repairs but was told the 2 issues are in no way connected. they spent 2 hours looking at the vehice and eventually said there was an isolation issue, causing the high voltage warning. They asked for ÂŁ600 to investgate further. As the vehicle was charging we decided to take it home and ponder waht to do. We took the vehicle home and agian it would not charge, either at home or on a super charger. We took the vehicle back and they kept it for several days before saying 10 cells on the traction battery need replacing (under warranty), but they had found "contamination" on high voltage cables and in order to rectify the cost would be ÂŁ6500, if the work was undertaken whilst the warranty work was being done. At a later date it would be more expensive. the most costly part on the estimate is a "module battery". Could anyone on here advise what that is, and also if we have any chance of arguing that this seems to be quite a common issue that they should take some responsibility toward.
We have not yet got a date for trhe traction battery work, due to the data breach, but im guessing they will soon want us to comit to the ÂŁ6500
Thanks in advance folks!!
 
#31 ·
Hi Bosleyrog
It would be good to get them to check the connectors within the battery module before replacing the HV Cables from the Battery to the Motor.
I know it is a known issue as the technician in my case had looked for it when the battery cover had been removed.
Also listed as a step within the procedure to inspect the connectors from inside the battery inclosure.

Get them to show you the contamination they have found and take photos.
The mated connectors are water tight and contamination should not be inside these HV connectors unless the seals had failed.
 
#18 ·
If you have a proper estimate sight of that (suitably redacted of personal detail) may give others an idea as to what is being proposed and the parts.

There are quite a number of posts on subjects related to isolation faults.

Depending on exactly what it is the could be coverages, there have been some success and some failure.

The only typical use of "module battery" would typically have the words reversed but parts descriptions and numbers should detail what it really is.
 
#20 ·

That'll be the BEM.

You may want to:-

Do some searching on here.
Open a case with Jaguar CRC.

There have been mixed results There has been recent clarification to what is covered via the battery warranty.

Good luck, hopefully you get further input. I am just relying on that I have read.

Ultimately if you do end up having tothe foot the bill (and I think it ought to be covered) used should be available from Trents. Whether that is practical with Vertu and also exact variant, vin locking etc could be problematic but potentially worth exploring.

The search function can help find threads. There have been a few
 
#24 ·
Imagine having an ICE car and receiving a quote for ÂŁ6.5k for a cable needing replacing or say for equivalence a fuel line.
Somenthing somewhere has to change to improve servicability of EVs.
and that's assuming the HV cable is the real problem.
If it's the connector highlighted earlier in the thread that's inside the battery pack and confirmed now as battery pack warranty to avoid needing to argue.
 
#27 ·
If 'Module Battery' is the BEM 6 - part of the traction battery there should no longer be any argument from JLR that it's covered by the 8 year battery warranty that was agreed with government as a way to stop customers worrying about the lifetime of the battery. Item 1 below is the battery.
When the dealer changed the modules within the battery there could also be some benefit of the doubt in your favour about reassembly

Image
 
#28 ·
Thanks Pacey, I really am lost with all this and vaule the knowledge and words on here.
I am not technically minded at all, The Mrs said "i like that one" and we bought it! And tbf the car has been fantastic upto the start of this year. I have Tesla and that has had no issues at all over the last 4yrs, thankfully!
 
#29 ·
Not the same as our Tesla, where I have lost count of the number of times it has been back to the service centre in the five years we have owned it. I tried to book it in for more work at the end of last week and they still have not got back to me with a date.
 
#30 ·
The part (1) that is posted by @Pacey has a description. I recall it's is broadly "battery".

Thus the BEM I linked to is a sub assembly of that.

Any right thinking person would think "well it's covered then".

JLR have form in refusing, and have refused busbars etc.

But the recent document seemed to clarify internal components were overed, and I think there is one case posted where they have relented on the BEM.

The challenge is escalation beyond a low level simple no.

It's difficult because a warranty is simply a contractual matter, ultimately a nudge decides.

As yet nobody seems to have seriously needed to head in that direction and it is a daunting prospect.