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Today my temperature settings read each increment number with a .5. like 22.5, 23.5, 24.5 etc. but then there was NO 22, 23, 24 etc. It has never done that. I then increased the temp to Hi and then back down and the .5 was gone.

Now I wish there WERE half degree increments in the temp settings like our VW Tiguan.

Is there a temp setting option in my Volt of which I am unaware?
 

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I've seen a similar thing with the cruise control where I tried to set the cruise to 70 mph, and it only goes from 69 to 71 back to 69. In this instance hitting cancel then set again allowed me to get to 70. I have never encountered the temp setting issue that you mention. Though I have mine set to F not C.
 

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Did you use OnStar to precondition?
Wonder if it set a temp in F which rounds to half C
Then the UI only allows you to +/- in whole degrees (in 2013 it lets you select half degrees, not sure why that changed for 14-15)
 
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