[rand49er]

^^^ Yeah, what Bazinga said.

Had mine done yesterday (took ~30 minutes) and it immediately came to mind reading your post. You'll have to reset to the "deferred" assisted engine heat setting. My ICE came on when I went to leave the dealership (the temp was 20 deg F) though I had previously set it on the deferred setting. I changed it without effect, and that's when I realized I needed to shut everything off to have it take effect.

 

[rand49er]

... Just to note, the amount of electrics/computers means that these cars are more like computers than Model Ts...you get failures, if any, early and then you are good to go. ...

Last fall, my wife's '12 SRX suddenly wouldn't start, but the windshield wipers were going by themselves along with the turn indicators and the radio. Thought it was possessed. Turns out it was the battery. Tech explained that if the voltage gets below about 10 volts, the computer starts going haywire. Put a new battery in, and all is well again. I'm sure the Volt's electronics/logic can get befuddled under unusual situations, too.