Dead Honda e

Faults and Technical chat for the Honda E
hurricaneh5
Posts: 15
Joined: Sun Jan 07, 2024 10:12 am

Post by hurricaneh5 »

Marcin wrote: Thu Jan 18, 2024 4:55 pm Samochody elektryczne wymagają więcej troski , lepszych warunków (garażu),więcej wiedzy technicznej klienta,niż zwykły samochód spalinowy.To potrwa kilka lat napewno.Są to problemy typowe wieku dziecięcego.Dotyczy Hondy E i ogólnie wszystkich elektryków.Są pionieży tacy jak my .Musimy liczyć się z takimi małymi problemami.Zazwyczaj są to pierdoły do szybkiego załatwienia.Jak dla mnie to nie stanowi problemu,choć rozładowana bateria,była zaskoczeniem
W moim przypadku ,była to ładowarka zamiennik,co po naładowaniu 100% Ev ,cały czas pobierała prąd z 12v bateri.Teraz to wiemi nie mam problemu.Zalecam kupić monitor bateri kilka € i szybko znajdziecie swój problem.Miałem kilkanaście aut w swoim życiu.Honda E jest na 1 miejscu,przypomina najbardziej Crx,który był pierwszą miłością i mam go do tej pory :)
Well said that man 👍🏻

rc203
Posts: 7
Joined: Wed Apr 03, 2024 12:48 pm

Post by rc203 »

@EEEE how have you got one since you did the 12v battery upgrade? Still holding charge well? I’m considering going for a 55Ah EFB Endurolune battery. I’ve just picked up a 2021 E and my 12v seems to be sitting around 12.2v with no load, think it might need replacing.
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EEEE
Posts: 603
Joined: Mon Aug 16, 2021 10:33 am

Post by EEEE »

I've had 0 problems since fitting the larger 65ah yuasa battery. Max voltage is over 13v (the car will not charge the 12v and bring this down during use) and the lowest after 2 weeks of sitting idle whilst on holiday (not plugged into the mains) was 12.41v so the car wasn't flat and I could get into it (which was a surprise!).

The larger battery does not fit properly into the battery tray, and the bracket does not fit either, but these are small prices to pay for a little assurance.
'21 e Advance - Charge Yellow - E1702RR alloys
'17 Civic Sport CVT
'00 Prelude 2.2VTi
rc203
Posts: 7
Joined: Wed Apr 03, 2024 12:48 pm

Post by rc203 »

Great stuff, thanks. Any additional routine 12v battery charging by yourself or just normal use (driving and HV charging).
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EEEE
Posts: 603
Joined: Mon Aug 16, 2021 10:33 am

Post by EEEE »

I have never performed additional 12v charging with the new battery (only when the car was flat on the old OEM Panasonic battery). I drive the car 5 times a week (2x 30minute commute + small lunch time excursions).

I was pleasantly surprised that after my 2 week holiday, the new battery wasn't flat! it was low, but the car was useable. Lock+unlock on the fob made the car wake up and do 1hour of charging. I suspect this might not happen when the battery is too flat / defective. To me, everything seems working properly.
'21 e Advance - Charge Yellow - E1702RR alloys
'17 Civic Sport CVT
'00 Prelude 2.2VTi
s2ke
Posts: 23
Joined: Fri Dec 20, 2019 7:00 am

Post by s2ke »

The car will charge the 12v with fan on

I have an accessory socket voltmeter and it shows charging pretty fast after you switch it on..I've not noticed it stop tbh

All my 12v issues were caused by sticking handled
green1
Posts: 67
Joined: Tue Mar 26, 2024 1:18 am

Post by green1 »

s2ke wrote: Sun Apr 28, 2024 9:28 pm The car will charge the 12v with fan on

I have an accessory socket voltmeter and it shows charging pretty fast after you switch it on..I've not noticed it stop tbh

All my 12v issues were caused by sticking handled
I have also noticed this with the fan/blower, if you set it to max (not any of the lower levels), the charging logic of the car will cause the HV to immediately start charging the 12V. This seems to occur every time without fail and can be confirmed directly with a Bluetooth monitor on the battery, from the 12V socket or from an OBD reader. So pretty much just use the fan occasionally and provided the door handles aren't glitching out I think sudden death is not a problem even with the stock battery.
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EEEE
Posts: 603
Joined: Mon Aug 16, 2021 10:33 am

Post by EEEE »

Using the demister or blower will cause the 12v circuit to get very high (up to 14.8v I believe at the bat terminals as measured with a BM2).

However - this is not really the solution to the problem. Charging a 12v battery and keeping it 'happy/healthy' is more than just blasting 14.8v at it for a short while. Perhaps you can buy yourself some time by gaming the system and driving with your blower on full, at the expense of your quiet cabin and blower motor wearing out.

The lack of overall oversight of the charging and inconsistency of methods used throughout the batterys lifetime, along with it being undersized and prone to draining below 10.5v, is what causes the OE battery to die.
'21 e Advance - Charge Yellow - E1702RR alloys
'17 Civic Sport CVT
'00 Prelude 2.2VTi
green1
Posts: 67
Joined: Tue Mar 26, 2024 1:18 am

Post by green1 »

I agree with your post. Oh I don't mean that it's a real solution, it's more of a battlefield repair. I don't actually use it in the manner described, although I do like putting the fans on at high briefly in this weather, but what I meant to say is I will keep an occasional eye on the voltmeter in the 12V socket if parked for an extended period, and I know that if it's going lower than it should, then "blasting" :D the fans should at least prevent a full brick.
JondaE
Posts: 1
Joined: Sat Jul 06, 2024 11:00 am

Post by JondaE »

Another dead E owner here. It's happened to us three times now. I really appreciate the information in this forum thread - it's good to know we're not alone. Our E is a 2022 Advance, which my wife bought ex-demo in August 2023. A couple of months later it was dead on the drive one morning. We called Honda Assist - AA came out and fast charged the 12v battery into life and told us to go for a long drive to charge it properly - which I found amazing at the time as I thought the need to drive to charge the battery was limited to ICEs. Thanks to this forum I've since learned a lot more about the E's charging system and the seat belt trick which does seem to work.

Just prior to this particular failure, the car had been trying (and failing) to pull an OTA update and we figured that might have had something to do with it. We did the update via mobile phone Wi-Fi and all was fine after that and through the winter.

In early June we woke up to it dead again. This time there'd been no sign of the car needing an update. I measured the 12v battery with a multimeter: 7v. We called Honda Assist - AA man came again, and did a fast charge to get the car on. This time I left the driver's seat belt plugged in and the car on, sitting in the drive. The main vehicle battery drained about 2% over the 90 mins I left it on, but the 12v system was fine (though my meter had gone on the blink so I didn't measure the voltage at the end of this period). We booked it into the local Honda dealership who said it it had an outstanding recall for a software update (the car hadn't notified us in any way, and neither had Honda). After a couple of hours they phoned and said "Software update's done - you can collect the car", but no-one had checked the battery or investigated the fault. We pointed this out, and they went away and did a battery test (which said the battery was "good"), and also said the software update had contained a fix for the 12v charging system, so all our problems would be solved. We were happy, to say the least.

Got home yesterday after a week away, and the car was dead again. It had enough power to open the charge cover in the bonnet, but not enough to accept a charge (the main battery was on about 60%). I managed to open the driver's door with the physical key and open the bonnet, and then connected a bench power supply to the 12v battery, which was reading about 7v. After charging at 2.5A for about 90 mins, the battery voltage was up to about 13.5 and the car appeared to be working fine.

I suspect that in our case the battery capacity (it's still the original battery) must be quite depleted, since I didn't think the voltage would have come up so quickly at that rate of charge. But there's obviously a current drain while the car is off, and Honda obviously knows there's an issue and hasn't been able to fix it yet.

Whilst my current thought is to attach a charge port to the front underside of the car for easy 12 trickle charging, this seems MADNESS for an EV that we have to plug into the mains regularly anyway. Having two separate charging systems to run an EV is the type of thing you'd expect the factory to be doing on very early prototypes, not customers on quite expensive production models.
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