# 2012 Volkswagen CC EPC Puzzle / Battery Drain **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [November 7, 2018, 4:14pm UTC](https://community.cartalk.com/t/2012-volkswagen-cc-epc-puzzle-battery-drain/128364 "2018-11-07T16:14:08Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![devlon](https://avatars.discourse-cdn.com/v4/letter/d/9fc348/32.png) [@devlon](https://community.cartalk.com/u/devlon)\ **Post date:** [November 7, 2018, 4:14pm UTC](https://community.cartalk.com/t/2012-volkswagen-cc-epc-puzzle-battery-drain/128364/1 "2018-11-07T16:14:08Z")
Hey guys — A puzzle for you. A couple of weeks ago, the backlight of my radio/nav display went out. The radio still works, but CD player doesn’t and backlight is still out. Today, I was driving along and an EPC light started flashing. Car started surging and revving. About 30 secs later, car completely went dead. Luckily I made it to shoulder of road and sat for a couple of minutes. Tried to startup car, but it only revved and never completely turned over. Had a friend come to try and jump. Didn’t help at all. Finally had it towed to dealer. Said battery was completely dead. Dealer is installing a battery and letting me know tomorrow. He said it might be the fuel pump. Is that something that could drain battery and cause backlight to short out? Only thing I recognize as symptom is couple weeks ago, nephew plugged in one of those dual phone chargers and had 3 devices charging. Shortly thereafter is when backlight shorted out. Only other out of the ordinary occurrence, I mistakenly put in a full tank of premium octane gas. I usually use midgrade. I wouldn’t think that would cause this, but it’s the only other factor out of the ordinary! Could that drain battery and kill it or is it possibly just a dead battery or more severe fuel pump? ---
**Author:** ![VOLVO-V70](https://avatars.discourse-cdn.com/v4/letter/v/8e8cbc/32.png) [@VOLVO-V70](https://community.cartalk.com/u/VOLVO-V70)\ **Post date:** [November 7, 2018, 4:57pm UTC](https://community.cartalk.com/t/2012-volkswagen-cc-epc-puzzle-battery-drain/128364/2 "2018-11-07T16:57:05Z")
> [@devlon](#): > > Only thing I recognize as symptom is couple weeks ago, nephew plugged in one of those dual phone chargers and had 3 devices charging. Shortly thereafter is when backlight shorted out. > > 3 devices plugged in - I call that clue. > > Only other out of the ordinary occurrence, I mistakenly put in a full tank of premium octane gas. I usually use midgrade. I wouldn’t think that would cause this, but it’s the only other factor out of the ordinary! Your are correct the fuel grade is not a problem with any of this. You did not say how old the battery was but they can fail without any notice at all. ---
**Author:** ![devlon](https://avatars.discourse-cdn.com/v4/letter/d/9fc348/32.png) [@devlon](https://community.cartalk.com/u/devlon)\ **Post date:** [November 7, 2018, 5:39pm UTC](https://community.cartalk.com/t/2012-volkswagen-cc-epc-puzzle-battery-drain/128364/3 "2018-11-07T17:39:58Z")
Oh, the battery’s about a year and a half old. Shop called and said it wasn’t the fuel pump. Turns out it was some burnt out fuse lines and fuses. I seriously thought the charger overloaded a fuse somehow. So having the battery replaced and new fuse lines (not sure what that is). Around $350. ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [November 7, 2018, 9:57pm UTC](https://community.cartalk.com/t/2012-volkswagen-cc-epc-puzzle-battery-drain/128364/4 "2018-11-07T21:57:13Z")
> [@devlon](#): > > new fuse lines Maybe fusible links?? Basically a wire that carries high current designed to burn out like a fuse so your car doesn’t burn to the ground.