miimura said:
If you have to take it to the dealer to diagnose the Check EV System and they determine that the 12V battery is the cause, you will have to pay for the diagnostic time. It will not be covered by the Platinum Extended Warranty since the battery is specifically excluded from that policy.
This is essentially the issue. The car goes berserk sometimes when the 12v battery is low. If you are out of warranty, or don't realize the cause, the situation gets messy and expensive (diagnostics, towing, replacing parts that aren't actually bad) for what in a normal car would just be a new battery. Therefore it's best to replace the 12v battery at the earliest sign that it's not OK rather than try to coax it along.