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Discussion Starter · #1 ·
Thanks for allowing me the time to look into the points raised with the Mazda MX-30 and I am sorry I missed your call today.

To answer the first question, there are no recurring 12v technical issues that we are aware of, with the MX-30. We can look into this further but would need a technical report raised by the diagnosing Mazda dealership with detailed information so the UK Technical Support team can investigate and advise further.

In relation to DC charging, the resistance changes as the battery state of charge increases, which causes the charge rate to fall due to that change in resistance. Temperature also plays a part as the car is doing everything it can to protect the longevity of the battery. Although we quote 20-80% charge in 36 minutes, this is at an ambient temperature of 20°c and with all other conditions being ideal, i.e. battery temp within the ideal range, etc.

There is a PCM update that allows winter mode to be activated at 5°c rather than -5°c, which would help, as the battery heater will operate earlier helping to warm the battery, but in colder temperatures, Rapid charging will take longer than the 36 minutes at 20°c. If this is something you are interested in, we would ask the local Mazda dealer to raise this with the UK Technical Support Team for instructions.

03457 484848 Customer services.
if you have issues with your 12v Battery going flat , or rapid charging issues please complain to this Telephone number. The more that log their concerns to Mazda , the more their Technical department will look at the issues.
 

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Mx-30 dec 2020 luxury polymetal grey
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I have a lot of troubles with my 12v battery lately. Car doesnt react, cannot unplug from my wallbox, mx-30 computer goes on and off, lights flickering etc. After 5 minutes and turning car on of ignition sometimes it will run again. I guess 12v battery is about to die? I have a video of its crazyness.
Is this what we are talking about here?
Grts Timo
 

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Yup that sounds very familiar. 3 times past 6 weeks already. The computer says i have to check this out with mazda.
I try to upload the vid i made about it but it doesnt let me.
 

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It's not just MX-30's that appear to have a 12v issue, so I'm sure Mazda are aware of it.
CX-30 had also an issue with the 12V battery. There was a software update but apparently mx developers don’t know any CX-30 software guys.
Just had software update to my MX last friday and sunday car is totally dead. 12V battery is totally dead.
Sad shit.
 

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Discussion Starter · #9 ·
I have a lot of troubles with my 12v battery lately. Car doesnt react, cannot unplug from my wallbox, mx-30 computer goes on and off, lights flickering etc. After 5 minutes and turning car on of ignition sometimes it will run again. I guess 12v battery is about to die? I have a video of its crazyness.
Is this what we are talking about here?
Grts Timo
Yes
 

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The death of 12V battery is a symptom of defected OBC (on board charger). OBC charges 12V battery from the high voltage battery. The defected OBC also causes the ”fast charging” to be not so fast. They said that the OBC fault code does not stay on the car memory (WTF!?), but it stays on Mazda Connect cloud.
My car the OBC error code appeared after they installed the new 12V battery.
Delivery time for new OBC is looooooong, but hopefylly replacement of OBC will solve the CCS fast charging issue.

There is a service alert about this OBC issue, but because the error code does not stay in car memory and if service has never seen this issue and does not have fast charger, they not able to find the service bulletin.

My guess is that if you use CCS often, you end up with the dead 12V battery. If you just use Type2, you never run into this problem. But this is just my guess, because my 12V battery died after 5 fast charger connections in one week. I normally just charge the car with normal wall socket 8-10A.
 

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Thanks for the update @JanneRäisänen. Unfortunately I think there is more than one issue with the 12v battery as I hardly ever fast charge and I’ve just encountered the flat battery problem for the seventh time today. I’m currently awaiting for Mazda assist to turn up and hope it will be quicker than last time, which was 21.5 hours!
 
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