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Hi,
I drove my wife's 2017 Volt on a long trip this morning. Turned on Mountain mode with 2 bars left on the battery icon, drove for 35 miles over flat terrain. No bars were added. In my 2013 Volt, such a drive would have added at least 2-3 bars. I'm not that familiar with the 2nd gen Volt, so is there some setting that I missed? Or does this mean that Moutain mode is not working? In the photo, I can see that there's a red line above the 2 remaining bars. Does that mean anything?
Thanks
 

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Hi,
I drove my wife's 2017 Volt on a long trip this morning. Turned on Mountain mode with 2 bars left on the battery icon, drove for 35 miles over flat terrain. No bars were added. In my 2013 Volt, such a drive would have added at least 2-3 bars. I'm not that familiar with the 2nd gen Volt, so is there some setting that I missed? Or does this mean that Moutain mode is not working? In the photo, I can see that there's a red line above the 2 remaining bars. Does that mean anything?
Thanks
You are correct, in the 2013 Volt MM would normally build up a 40% charge. In the Gen 2 Volt such as your wife's 2017 MM only builds up a 15 - 20% battery reserve (approx. 2 bars on the meter) so that is why you did not see a change.
 

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Thanks so much for the explanation. Is there a reason why MM is restricted to only 20% in the 2nd gen Volt?
The ICE on the Gen 2 Volt is more powerful than on Gen 1 and rarely, if ever, needs to tap the battery and electric motors for assistance even in mountainous driving. Think of MM on the Gen 2 Volt as a vestigal feature held over from the Gen 1 Volt.
 

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Also the battery is bigger in the Gen2 so 20% of a bigger Gen 2 battery is closer to 40% of the smaller Gen 1 battery than it might be apparent.
 

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In addition, the Gen 2 Volt simply doesn't need Mountain Mode unless you want to recharge a little for off-highway driving.
 
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