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Discussion Starter #1
I have never experienced the chuggle before. I've driven the car in hold mode plenty of times and drained the battery once. However with ERDTT I am experiencing it big time. Anybody else?

I'm worried about taking it to the dealer and them being able to reproduce. It's going to be too warm here for the next week so ERDTT won't happen. The problem has only come up yesterday and this morning because of the cold snap.

Thoughts?
 

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Yes, I'm experiencing it and only in ERDTT like you. My 2017 is less than 2 months old so thought I'd wait and see if it improves.

I've used nearly 2 tanks using hold mode on the highway and never noticed any issues. When it got colder, down to appropriately -12 to -15 and lower ERDTT kicked in and noticed it occurring in the 80 to 105km range.

It's being discussed in a few other threads. One person said it went away after a year, another said it just improved. Someone also said they brought to the dealer and it was labeled "normal".

Apparently there was a FW upgrade on 1st Gen but haven't seen anything mentioned for 2nd Gen.

I don't like the sounds of it, winters are long in Canada and over time the load/no load effect on the engine can't be good on affected clutch, drive chain, etc.

I will be telling an interested buddy to hold off until this is resolved. Until now I was pretty much singing the praises of the engineering!
 

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Part of this could be that your engine isn't running as well in the cold, which is unlikely but possible (I already had bad plugs in mine, at like 2k miles).

What it really most likely is, is the fact that the engine is running at an RPM independent of the acceleration load or vehicle speed, but it still tries to clutch the engine in sometimes. There's a larger speed differential so you're going to notice more jerkiness. That's just my theory, but that's what I would guess is most likely.

I always use Hold mode if I'm going to be driving over 60 MPH so I don't have any data to personally verify this.
 

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So what's the fix? Is there a TSB? Do ALL Gen II have this? I only have 6 miles on my ICE since new (Aug delivery and 3000 miles).
 

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So I'm gonna make a bit of a prediction on this. My car had the chuggle badly until I got a few thousand on the engine. As me and a few others suspect, the chuggle results from imperfect clutch engagement and goes away as the clutches wear in and the adaptive learning in the powertrain catches up. As of today, I pretty much have no chuggle worth mentioning (and I'm picky).

I have noticed some slight chuggle in very cold weather upon initial startup (speaks to the engine not running tremendously on startup when trying to minimize startup enrichment...a tall task). But more importantly, I think some of it also comes back to the powertrain learning. The properties of the lubrication will not be the same at 15 degrees as they are at 60; nor will be the engine response to inputs. It is hard to imagine manufacturing so perfect that this is 100% consistent across all conditions...so the adaptive learning is important. As such, I am not surprised some people are experiencing it when they haven't before. Just give it some time and I think it will disappear and it goes through a number of cycles.
 

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So I'm gonna make a bit of a prediction on this. My car had the chuggle badly until I got a few thousand on the engine. As me and a few others suspect, the chuggle results from imperfect clutch engagement and goes away as the clutches wear in and the adaptive learning in the powertrain catches up. As of today, I pretty much have no chuggle worth mentioning (and I'm picky).

I have noticed some slight chuggle in very cold weather upon initial startup (speaks to the engine not running tremendously on startup when trying to minimize startup enrichment...a tall task). But more importantly, I think some of it also comes back to the powertrain learning. The properties of the lubrication will not be the same at 15 degrees as they are at 60; nor will be the engine response to inputs. It is hard to imagine manufacturing so perfect that this is 100% consistent across all conditions...so the adaptive learning is important. As such, I am not surprised some people are experiencing it when they haven't before. Just give it some time and I think it will disappear and it goes through a number of cycles.

I suspect it's all that + maybe some little other things. The big problem I have with that is this. I use the engine when traveling 50+ miles at highway speeds, something I do maybe 5 or 6 times a year (at MAX, some years I don't take any road trips and just fly). Now the problem there is it's a constant speed, 70 mph, and with cruise control. The clutch will always be engaged. Around town in the cold down near 30 to 40 mph (which is where I feel this drag like chuggle) the engine runs only maybe 20 miles a week, and we're only cold enough to need that two or three months out of the year.

I fully expect by the end of my 3 year lease I'll only have maybe 1,000 to 2,000 miles on the engine with probably half of those at a steady freeway speed....
 

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Discussion Starter #7
It's nice to know that it isn't just me. It definitely feels like some clutch is being engaged when it shouldn't be.

How do I get a hold of a volt adviser? I've seen people mention it a bunch but I don't recall seeing instructions.
 

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How do I get a hold of a volt adviser? I've seen people mention it a bunch but I don't recall seeing instructions.




It is hidden in plain sight within your Owner's Manual although it is called Chevy Customer Service instead but same telephone #!;)
 

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How do I get a hold of a volt adviser? I've seen people mention it a bunch but I don't recall seeing instructions.
Your local Chevy dealer should be able to get you in touch with one if you call their service department. Some of them (like mine) even have online "contact a service rep" form where you can write to a service representative and they'll help you personally through e-mail.
 

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It's nice to know that it isn't just me. It definitely feels like some clutch is being engaged when it shouldn't be.

How do I get a hold of a volt adviser? I've seen people mention it a bunch but I don't recall seeing instructions.

If you do, please follow up here! I'm kinda just pushing this off to "normal way the car works" but it seems really odd for them to design a system that clutches in and out every couple seconds. I can't seem to track down a TSB that I can directly reference if I talk to my dealer for the 2017 Gen 2s for this issue and I doubt they'll be helpful (they knew VERY little about the Volt and sales benefits when I purchased it, I had to do a lot of the leg work and ask them to follow up then...) so if this is an issue that can be corrected via software or service I need to be able to direct them exactly to what the solution is...
 
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