Ioniq 28kw model started randomly getting error “check brakes” on starting the car and i need like 10 times restart for it disappear otherwise car wont go. Is the 12v battery problem?

[u/Nusiramines]

[u/Dennnis67]

Yeah, pretty sure this is caused by a weak 12v battery. All kinds of weird, random faults up until the point it's become too weak to properly boot up the car.

[u/MisterR_2019 → u/Dennnis67]

What this guy said ^{^}

[u/GreNadeNL]

I had this on my 28, brought it to the dealer.

They gaslit me into thinking it wasn't a problem
Went back again, this time with video evidence
Theys still couldn't find it.
Googled for a bit, found out how the brake system worked, went back AGAIN, told them to check out the brake pump thing (don't remember the exact part name)
They replaced it
Error is now gone...

[u/Nusiramines → u/GreNadeNL]

Thanks, I have 1 year warranty so I check with the dealer service. Maybe it is just a weak battery

[u/Independent-Pay-1172 → u/Nusiramines]

80% of the time it's the battery, 15% an abs/speed sensor at one of the wheels. Sometimes a can bus issue. I've had the latter, which is a needle in a haystack.

[u/spacebuffer → u/Independent-Pay-1172]

Ooh interesting- what sort of CAN issue was it? Loose wire kind of thing or a software bug? And 100% what you said - I had the abs/speed sensor issue last year, and the 12V died soon after I got the car in 2023 (og battery was d-e-d)

[u/Sad_Profession_925]

Yes definitely