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Hi Everyone,

This is my first post on this forum. I purchased a used 2015 Volt, with about 14k miles, about six weeks ago. I've been driving it daily. It has been hot here in St. Louis, in the mid-90's. I park the car in the shade while at work. A few days back, with plenty of charge, I found myself unable to put the CC into Comfort mode. I generally like to use Comfort mode for the first few minutes when getting into a hot car.

I tried stopping the car, turning it off, and restarting, to no avail. The car hasn't done this since. Any ideas of what could be going on? I only have a month left on my B2B factory warranty.

Thanks,

Charlie
 

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I've had a few climate glitches with my 2013. One time it got stuck in cooling even when calling for heat. Once it did as yours is, only it was eco I couldn't have. If it doesn't reset with a shut down, a 12v battery disconnect for a minute or two should fix it. You'll only have to reset the clock, maybe the date, and perhaps a few of your customized settings. Not too big a deal though.
 

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Might want to check with your dealer about related software updates. I had one applied to my '14 a while back and it was related to the MyLink radio unit. I don't remember why but it might have applied to '15 Volts too.
 

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I agree on pulling power at the 12V battery. 90% of "glitches" are almost always fixed with a hard reset of the 12V power supply. Remember, we're dealing with lots of computers integrated into our car, and as such, anyone who's used a computer knows that odd operation almost always fixes itself with a reboot.
 

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I've had my fan control buttons gray out and be unresponsive before on the screen, but they still worked using the dash buttons. I've also had the fuel gauge bars disappear despite having 100+ miles of gas range remaining. Those are the only two little computer glitches I've come across, and both went away after pulling over, turning the car off, waiting about 30 sec, and turning it back on. I thought maybe my 12v was going bad, but I had it tested and it was fine. Just a fluke glitch. Hasn't happened again.
 

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I agree that cold rebooting usually fixes weird computer glitches.

In the old days, IBM would jump on any anomaly and the software was designed to preserve all the evidence.

Nowadays, a bug has to appear regularly and the processors only log enough information to categorize the problem. I don't know whether the Volt's many computers are capable of taking a full snapshot of all memory, but you can't trigger that and vendors will only look at a recurring problem, preferably one that can be reproduced.

My favorite story is how Microsoft publishes a list of bugs and has users vote on which bugs to fix. The lower voted bugs are just ignored.
 

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Consider pulling the hvac fuse as an option too. Not sure what fuse it is but there is one.
 
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