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Discussion Starter · #1 ·
12v battery recall for software update - just had a letter from Mazda and had to book car in for software update ( service campaign) due to the ECU which may not be going into sleep mode after the ignition is turned off, they say in which case an electrical current may continue to flow causing the 12v battery to discharge, so requires a software update.
Only posting this as I think I have seen a post saying that their 12v battery was going flat, and think bc another said they thought their phone cable left plugged in had drained the 12v, which did seem a bit strange, maybe this is the real reason.
 

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Mine died completely - even while plugged into the charger overnight. Bit of a surprise that an EV can do absolutely nothing with a dead 12V. I couldn't even unplug the charging wire.

Road services came and said "If we need to move the car, I need to call for another truck. You can't tow EVs".

Didn't know about that, but apparently Neutral gear setting only works with power on the motor. When everything is dead, you have to lift the front wheels up to move the car. If you do tow it, you might break the electric motor.

Got it into the shop, they spent two days "cooking the battery", whatever that means. And called me in a few days later to tell me a new firmware has been released that fixes this problem. Nice.

All that aside, I absolutely love the MX-30, quirks and all.
 

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Discussion Starter · #4 ·
Mine died completely - even while plugged into the charger overnight. Bit of a surprise that an EV can do absolutely nothing with a dead 12V. I couldn't even unplug the charging wire.

Road services came and said "If we need to move the car, I need to call for another truck. You can't tow EVs".

Didn't know about that, but apparently Neutral gear setting only works with power on the motor. When everything is dead, you have to lift the front wheels up to move the car. If you do tow it, you might break the electric motor.

Got it into the shop, they spent two days "cooking the battery", whatever that means. And called me in a few days later to tell me a new firmware has been released that fixes this problem. Nice.

All that aside, I absolutely love the MX-30, quirks and all.
Thanks for your reply, it a bit of a worry until we get the fix done on Thursday this week. We did not buy this car believe it would all be plain sailing as EV’s are newish and on a Learning curve but hopefully we won’t have too many issues to deal with. Glad your cars fixed.
We do love the car and at the moment free to run as our town in the U.K. has free to charge EV points, 6 in total. We don’t do many miles per year, and only had the car 3 weeks, but have done about 300 miles and not cost us anything. We are just getting the hang of the regenerative brakes and did a 16 mile journey on country roads and when we got home it had only dropped 4 miles of range.
glad you like the car.
Jewels
 

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Basically the 12v battery can drain if you leave things plugged in and working, leaving lights on etc. or simple things like not locking the doors. Pretty much like an ICE car in certain aspects. The fix is to monitor the 12v battery and stop providing power when a certain point is reached to ensure the car system has enough power.

The 12v battery enables relays and ancillaries to kick in as part of the ev start process and when it drops below a certain level the car is effectively dead hence this fix.

I had it done yesterday as well as the rather complex ev battery heater solution I hope I never need to use! Fixes are am035a (12v) and am036a ev battery heater. You will not notice any difference after the s/w updates other than the knowledge it is there.

Hope it goes well.

Alan
 

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Discussion Starter · #6 ·
Basically the 12v battery can drain if you leave things plugged in and working, leaving lights on etc. or simple things like not locking the doors. Pretty much like an ICE car in certain aspects. The fix is to monitor the 12v battery and stop providing power when a certain point is reached to ensure the car system has enough power.

The 12v battery enables relays and ancillaries to kick in as part of the ev start process and when it drops below a certain level the car is effectively dead hence this fix.

I had it done yesterday as well as the rather complex ev battery heater solution I hope I never need to use! Fixes are am035a (12v) and am036a ev battery heater. You will not notice any difference after the s/w updates other than the knowledge it is there.

Hope it goes well.

Alan
Hi Alan
Thanks for your message, nice to know. Happy driving and of cause Christmas.
Jewels
 

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I had it done yesterday as well as the rather complex ev battery heater solution I hope I never need to use! Fixes are am035a (12v) and am036a ev battery heater. You will not notice any difference after the s/w updates other than the knowledge it is there.

Hope it goes well.

Alan
Hi Alan,

Going to Mazda tomorow to apply same patches. (y)
 

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Mx 30 2021 GT SPORT TECH
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Had my update and a locking fault fixed over the last few days, I never had issue with dead 12v problems like others here but glad the update will sort this out.
however the fake engine noise as considerable dropped in volume to the point I can just here it which I’m glad tbh
there is no internal settings to turn this off or on as most of us know and I know you can turn it off via a few button pressing but that is on a different post.
 

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Had my update and a locking fault fixed over the last few days, I never had issue with dead 12v problems like others here but glad the update will sort this out.
however the fake engine noise as considerable dropped in volume to the point I can just here it which I’m glad tbh
there is no internal settings to turn this off or on as most of us know and I know you can turn it off via a few button pressing but that is on a different post.
i had warning light this morning low 12v malfunction . Called RAC needed new battery he said they shouldn’t go within 18 months battery is supposed to last 3 to 5 years . I checked with mazda garage my reg no wasn’t on a recall . Only got 18 months lease to go on car . Let’s hope new battery lasts next 18 months 😂
 

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MX-30 Makoto Machine Grey Metallic
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i had warning light this morning low 12v malfunction . Called RAC needed new battery he said they shouldn’t go within 18 months battery is supposed to last 3 to 5 years . I checked with mazda garage my reg no wasn’t on a recall . Only got 18 months lease to go on car . Let’s hope new battery lasts next 18 months 😂
The 12v lead acid battery is usually pretty reliable, but they are a mass produced commodity item now… So, your could have just been a duff one. Fingers crossed the new one will be fine.

I am intrigued how often the MX-30 brings the aux 12v system on!
 
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