2015 A3 e-tron won’t start

[Clarke]

My 2015 A3 e-tron has been flawless for six years, but after a full charge, it suddenly won’t start, all systems failing, warning lights cycling, and even the locks don’t work. Service centers just say to tow it in, but could this be a 12V battery issue? Anyone else dealt with this?

 

[EtronDriveR2024]

This forum mainly focuses on full e-trons, but your issue could be a failing 12V battery.
In hybrids these last about 8 years, and when they fail, they cause system malfunctions and prevent the car from starting. So, it easier to identify the issue.
I would try to charge or jump-start the battery in your car. If that works, then I think you will need a new battery.

 

[Clarke]

That makes sense, an aging 12V battery could definitely be the culprit. I’ll try jump-starting it and see if that helps.