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If the car is off and an aftermarket accessory is left on and draining the 12v battery will the traction battery charge the 12v?
 

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Short answer, NO.

The 12 volt battery is ONLY charged when the car is turned "ON".

And, like any other 12 volt battery, running it dead is bad for it.

However, the Volt turns off all accessory outlets when you shut the car off.
 

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Short answer, NO.

The 12 volt battery is ONLY charged when the car is turned "ON".

And, like any other 12 volt battery, running it de3ad is bad for it.

However, the Volt turns off all accessory oulets when you shut the car off.
The 12v battery is also charged while the traction battery is being charged. Once the traction battery is fully charged, the 12v battery is no longer being charged, even if the car continues to be plugged in. This true for gen 1. I don't know how gen 2 deals with the 12v battery.

KNS
 

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The 12v battery is also charged while the traction battery is being charged. Once the traction battery is fully charged, the 12v battery is no longer being charged, even if the car continues to be plugged in. This true for gen 1. I don't know how gen 2 deals with the 12v battery.

KNS
Really the only difference is how the 12V battery is charged during "active" traction battery charging. On the Gen1 there was a dedicated hard-wired charge circuit from the On-Board Charging Module used to accomplish this.

On the Gen-2 it uses the GMLAN (CAN) messaging to wake up the Accessory/14V Power Module (APM) and BCM so it now functions during charging in a similar fashion as being ON.

Don't forget starting in 2013 Gen1 cars added "Battery Maintenance Mode" that, while plugged in will routinely check and if necessary charge the 12V battery to keep it maintained. The feature hasn't really changed in 2016 other than the aforementioned source of the charger current.

More complete info on the Battery Maintenance Mode can be found in the FAQs here:
http://gm-volt.com/forum/showthread.php?5409-Auxillary-Battery&p=1292514#post1292514


HTH
WOT
 

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What car in the world charges the 12V battery when it is turned off?
All EVs that have an aux 12v battery do. Car turned off + charging = 12v also charging.
 
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