Blue highway
Well-Known Member
- First Name
- Steve
- Joined
- Oct 15, 2021
- Threads
- 5
- Messages
- 2,420
- Reaction score
- 3,768
- Location
- Oregon
- Vehicles
- Mach E Premium SR RWD

EVs have these issues because the battery is used differently than in an ICE car... and because of this, they are much smaller. The "warning" that ICE cars give you is often noticeable slower cranking... although you don't always notice the loss of capacity before it is unable to crank the car... my Cadillac did that... there can be a "warning". In an EV, you need just enough capacity to light up the computers and fire the HV relays... when there is not enough current capacity to do this, the car goes from perfect to complete fail all at once.I dodged the very early 12v battery problems some folks had with their not-even-old 2021s and replaced my Mach E with a Genesis GV60 before my '21 Mach E has any age-relayed 12v issues.
6 months into owning the GV60, I came out to a flat 12v battery and a dead vehicle that was over 90% hv soc when I drove it an hour earlier.
Genesis does provide a physical key - not in the fob but in package that could fit in your wallet. (Some folks gripe about it not being integrated into the fob but with paak and face/fingerprint unlock, separate probably makes sense.)
The battery cover can be opened and moved out of the way by hand without removing any fasteners. (Although the manual instructs you to remove one plastic pop faster. I couldn't figure that out but I did "discover" the rotate trick.)
So I guess Genesis did the mitigation part better....but why are EVs having these no-warning 12v battery issues?
There are no DTCs, no messages....
After the first episode, I bought a Bluetooth battery monitor.
The vehicle was even plugged in when this happened!
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The real warning that the battery gives you is a calendar. Replace the 12v battery at 3 years and save the aggravation of having to do it when the car doesn't start.