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I was driving the 2017 Volt this morning and the engine turned on multiple times while the battery was almost full. Anybody know why? The outside temperature was cold, in the 20s. Could this be the reason? Was the Volt trying to use the engine the heat up the car?

Thanks.
 

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I was driving the 2017 Volt this morning and the engine turned on multiple times while the battery was almost full. Anybody know why? The outside temperature was cold, in the 20s. Could this be the reason? Was the Volt trying to use the engine the heat up the car?

Thanks.
Yes to the first question. Yes to the second question.
 

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I was driving the 2017 Volt this morning and the engine turned on multiple times while the battery was almost full. Anybody know why? The outside temperature was cold, in the 20s. Could this be the reason? Was the Volt trying to use the engine the heat up the car?

Thanks.
If it was because of the temperature, there should have been a message on the dash reading "Engine Running Due To Temperature". It also could have been because of Engine Maintenance Mode or Fuel Maintenance Mode.

If it was ERDTT and it was above 15 *F, you probably have the "Engine Assist Heat" setting set to "On" instead of "Deferred".
 

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Engine Assist Heat
page 143 in the manual.
 

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If it was because of the temperature, there should have been a message on the dash reading "Engine Running Due To Temperature". It also could have been because of Engine Maintenance Mode or Fuel Maintenance Mode.

If it was ERDTT and it was above 15 *F, you probably have the "Engine Assist Heat" setting set to "On" instead of "Deferred".
ELR and GenII Volt don't have the ERDTT DIC message. You've seen it on your 2016?
 

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ELR and GenII Volt don't have the ERDTT DIC message. You've seen it on your 2016?
Yep; the first time it starts the engine for ERDTT each ignition cycle it shows the message, usually accompanied by the "Ice Possible: Drive With Care" message. Maybe they removed it for 2017 to make it seem like less of an oddity to Volt newcomers?
 

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ELR and GenII Volt don't have the ERDTT DIC message. You've seen it on your 2016?
Yep; the first time it starts the engine for ERDTT each ignition cycle it shows the message, usually accompanied by the "Ice Possible: Drive With Care" message. Maybe they removed it for 2017 to make it seem like less of an oddity to Volt newcomers?
The relevant sections in the 2016 and 2017 manuals are identical:

"ENGINE RUNNING DUE TO TEMPERATURE
This message displays when the
high voltage battery is charged but
the engine has to come on because
of the outside temperature or high
voltage battery temperature."

Page 132 in the 2016 manual, page 134 in the 2017 manual.
 

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Yep; the first time it starts the engine for ERDTT each ignition cycle it shows the message, usually accompanied by the "Ice Possible: Drive With Care" message. Maybe they removed it for 2017 to make it seem like less of an oddity to Volt newcomers?
I get the "Ice Possible" message even w/out ERDTT.

Best,
Rick
 

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I get the "Ice Possible" message even w/out ERDTT.

Best,
Rick
Me too; I used to have my EAH setting set to "On" instead of "Deferred" so the messages would come on at the same time, but I've been using "Deferred" now so I also get the ice (not to be confused with ICE ;) ) message by itself.
 

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I get the message every time the engine starts for ERDTT. Wish I could turn it off. Bad enough to have to suffer thru the engine whether I like it or not. But the constant reminder is a nuisance. I know I can turn off the DIC, but I like the power gauge and other stuff. Nasty cold snap here till end of week. Gonna be a lot of ERDTT.............
 

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I get the message every time the engine starts for ERDTT. Wish I could turn it off. Bad enough to have to suffer thru the engine whether I like it or not. But the constant reminder is a nuisance. I know I can turn off the DIC, but I like the power gauge and other stuff. Nasty cold snap here till end of week. Gonna be a lot of ERDTT.............
Well, I and several others have chosen to no longer have to suffer thru an unexpected ERDTT event for the last several years due to a simple resistor mod. Have no regret performing the mod and haven't run into a situation where I actually have needed ERDTT since HOLD or MOUNTAIN mode work just fine!:)
 

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I don't see why you'd want to avoid ERDTT...it's more efficient to heat the cabin with engine heat. Some days I'll actually drive in HOLD even if it's warmer than the ERDTT setpoint for a few miles to warm it up. I have an engine, I might as well use it...I already have to use it during my 100 mile/day commute.
 

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Does no one read their owners manual?
Amazingly, I rarely read any previous owner's manuals, but because of the wealth of information busied in this one, I did read the owner's manual with my gen1.
 

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FYI, you still get the ice warning even if you have ERDTT set to "Deferred".
 

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FYI, you still get the ice warning even if you have ERDTT set to "Deferred".
Yup, see these two and the no TPS warning twice a day!
It's getting old really fast to have to dismiss 3 or 4 warnings every time you start the car so you can get your chosen centre info.
We need some kind of settings for choosing which warnings we are interested in.
 

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In the don't criticize without suggesting a solution camp...

In Canada TPMS are not required in winter, so at least for this warning it shouldn't be forced on us. BTW, I would also be surprised if it was mandatory in all U.S. states.

If they are worried about meeting upcoming requirements for summer, there is still a solution. The car likely knows the date through OnStar, so from November to April if all 4 are missing it could easily pop up a warning asking to acknowledge winter tires.
 
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