Check your ground on your 2011 Sonata
 

We drove our new 2011 Sonata on Sunday and when we went to drive it on Thursday, the car was COMPLETELY dead. Not even a dome light. The battery would not take a charge and could not be jumped.
Had to have the car towed to the dealer, and they found that Hyundai paints the frames before attaching the ground strap for the electrical system. They also said that they had seen this before on some of the 2011's.
If you are going to have your car in for some routine service like an oil change, it might serve you to have them check the ground for the car and make sure it is contacting metal.....ours now is!

About everybody building anything mounts cables to painted surfaces..

Anyway, in the 2011 Sonata, (been discussed at training last summer),,, Hyundai rail part where cable is bolted uses a single 6mm bolt.

Their repair is to bore the hole, and tap it with a 8x1.25 tap, bore hole on cable end lug, and attach cable back to the painted (insulated) surface and use a 8mm "star" washer as grounding aid... now thats funny..

We been taking NF Sonata and grinding paint off to bare steel, slap it with anti-sieze to cover the bare steel, and install metal lug to metal surface for 100% contact.. goes against Hyundai electrical flow plan.

Hyundai claims the current flow is from threads through bolt, then bolthead to lug into cable...
so the lug is bolted to painted surface (insulated)... and over time, the threads of the bolt rust, along with threads of the body side fastener (more insulation)... we aint going to ever pass full electric through all that insulation..

Ummmmmmmmmmmmmmmmmmm....yeah, what you said!!!!!!!!!!!!!!!!!!!