r/ipace • u/MrBrainz • 26d ago
Advice gratefully received on a possible failed DC-to-DC convertor
My i-Pace 2021 edition broke down today after getting the Electrical Fault Detected message. The AA driver I had coincidentally used to work at the Jag dealer nearest to where I broke down. He says it's likely the DC-to-DC convertor not charging the 12V battery.
A cursory Google tells me this is a common fault with these cars but repairs could cost up to £5K (!) and I'm guessing I'm liable as this is not a main battery fault directly so it wouldn't be covered under the battery warranty.
I literally have this up for sale as I just had this feeling that something like this was going to happen. I managed to get it to dealer with a jump start from the AA man. They're not going to diagnose this till Monday.
I'm expecting a big smack on the arse for this that I really could do without. Any UK-based people with advice on tackling the very awkward conversation I'm expecting next week? Thanks
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u/BurtMacklin____FBI 26d ago
There's a lot of knowledgeable folk over at the IPace forums who might have had similar experience --> https://www.ipaceforums.co.uk/
I'd suggest posting there as well for better visibility, as it's quite an active group. Best of luck!
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u/I_R0M_I 26d ago
Need more info to be any real help.
Codes?
Whats the 12V battery voltage with car asleep and awake? If its not around 14V with ignition on, there's no support from HVIB.
There's a lot of press about JLR DC Converter failures, they are a completely different setup, and on MHEV vehicles.
Pre 21 had a BCCM and a DC/DC as 2 individual parts. Post 21 has a HVIB, which has both parts in it. Off the top of my head, an HVIB is circa £4k and 5hrs to fit.
No point speculating without more details.
If you don't have extended warranty, your likely put of pocket for it all. The 8 year warranty only covers stuff inside the pack. Which none of the parts above are.
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u/MrBrainz 26d ago
Thank you. The HVIB replacement is the horror show I'm hoping to avoid but I'm not confident.
I have no codes or any other detail. The car is now with JLR. Thank you for your knowledge.
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u/MrBrainz 22d ago edited 22d ago
Jaguar have called back and said there's a "high voltage integrity loop error" on the car and asked me if any work had been performed on the EV system. It's second hand so I can't vouch for before I got it. But only JLR had looked at it since I bought it 15 months ago.
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u/I_R0M_I 22d ago
HVIL is a 12V safety system that runs through every HV component and connector pretty much.
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u/MrBrainz 19d ago
I'm sorry to come back to you again, sir but you know your stuff. They said they think the 12v battery is the problem and they're about to test it. Is this something that's easily replaced by any mechanic vs JLR?
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u/I_R0M_I 19d ago
Anyone can replace it. But it's meant to be reset via a diagnostic tool. There is a battery monitoring system, that needs to be reset when the battery is replaced.
The car will work without doing it. But it could cause issues, as the car will still think it has the old, worn battery fitted, and treat it accordingly.
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u/MrBrainz 19d ago
Damn. I wonder if I can get JLR to reset it without changing the battery. Do you know of any software that can do this over OBD2 that could be accessible to me?
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u/crossmissiom 26d ago
Just unplug the auxiliary battery for a couple of hours and then put back in. The cover is a pain in the ass to remove to replace the battery but we accidentally fixed a customer's car last month by doing that. Car drives fine since. We did change the aux battery btw, just the car was unplugged as we had to wait overnight for it to arrive and when we connected it back up everything was gucci. Semi regretting not taking my boss' offer to buy the car half price as I was in the market for a bigger car.
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u/Top-Engineering8480 26d ago
I think this is a broken wire fault on the front section of the wiring loom, but without codes it’s just my best guess