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Discussion Starter #1 (Edited by Moderator)
I have owned my 2013 volt 4 months and have always left my house with 40 miles of range. I get to work with 31-33 miles of range left. Work is 10.7 miles away. I work 10 hours, no charging at work. When I go to leave I have 21-24 miles of range. I drive home the same 10.7 miles and usually have 11-13 miles of range left. If I skip going home and continue to drive I can get 30ish miles of range. On the weekend I can drive 45 miles on a charge. I thought this was normal as this summer has been super hot. I thought it was the batteries thermal management taking care of the battery. I found the thread about a 2013 getting its battery replaced and found PIC 6138A mentioned and was told my car isn't behaving as it should. So today I called the volt team and was told my car is behaving as designed and to not bring it to a dealer unless I have error lights or loose another 10 miles of range. The volt advisor I spoke with seemed completely clueless about basically anything and instills more worry about GM backing a car and fighting for repairs.

Who is correct? Me or the advisor?
 

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Search the forum for HPCM2 reprogram issues. Some units that had the HPCM reprogrammed developed issues due to a bad programming procedure and caused symptoms like you are describing. A reflash of the unit restores the computer.

Another symptom is when the total power used is falling into the 8.9 to 9.5 amp range when it should be in the 9.9 to 10.8 range. The dealer should be able to tell from the history of updates on the car if in fact the HPCM2 was reprogrammed.

It is normal to lose a few miles when parked and sometimes you may even gain a mile or two when parked but if you lose greater than 5 miles each time you park for a few hours then this could be the issue.

However, if your driving habits were drastically different then the past owner, the computer may still be adjusting its guesstimate and of course the weather is getting cooler at night so expect overall range to start dropping this time if year, more so if you are located in the northern parts.

http://gm-volt.com/forum/showthread.php?249034-9.9-kWhr!-help!/page2&highlight=hpcm
 

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Your ten hour shift...end up after dark? The temps in our area lately have been about 55F anytime after 8 or 9. Doing quick math it sounds like your 22 mile round trip plus the range left ~13 adds up to about where I'd expect a '13 to be this time of year. Don't be surprised if it goes up the next few days due to abnormally warm days and goes back down this weekend as we're supposed to be cooler than normal!
 

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Every fall the forum gets the same posts. The answer is always the same: cold temperatures suck energy.
 

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Discussion Starter #5
Battery losses range while parked

I start at 6:30am so it's light out. It haven't gotten under 60* yet during the day. I mentioned the HPCM2 reprogramming to him and he said he couldn't find anything under that search. He said there was no mention anywhere in his documentation of a botched update. Never heard of such a thing.

He said there was a update campaign for the car but it was closed. Even if I could still use a majority of the range after being parked it would be ok. If I stop and then continue I shouldn't loose this much range until winter I've been told. I've seen posts locally with 25-30 miles of range driving in snow using heat. I don't use the HVAC system at all usually. Windows down, speeds around 40mph.

How come I can still get over 40 miles of range in comparable temps if I keep driving?
 

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When I park while at work my car sits outside for about 10 hours summer/winter. My Volt's (have owned 3) will loose a couple of miles on the GOM. The biggest hit I saw was the day it was minus 16 degrees out when I left home and it stayed BELOW ZERO all day. The car consumed about 10 miles of range just sitting. That day I used the entire 10.2 kWh from the battery burned .5 gallons of gas and only drove 22 miles.
 

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I have owned my 2013 volt 4 months and have always left my house with 40 miles of range. I get to work with 31-33 miles of range left. Work is 10.7 miles away. I work 10 hours, no charging at work. When I go to leave I have 21-24 miles of range. I drive home the same 10.7 miles and usually have 11-13 miles of range left. If I skip going home and continue to drive I can get 30ish miles of range. On the weekend I can drive 45 miles on a charge. I thought this was normal as this summer has been super hot. I thought it was the batteries thermal management taking care of the battery. I found the thread about a 2013 getting its battery replaced and found PIC 6138A mentioned and was told my car isn't behaving as it should. So today I called the volt team and was told my car is behaving as designed and to not bring it to a dealer unless I have error lights or loose another 10 miles of range. The volt advisor I spoke with seemed completely clueless about basically anything and instills more worry about GM backing a car and fighting for repairs.

Who is correct? Me or the advisor?
It's getting cooler in New York this time of year.
So many factors.
Personally, I ignore the V-Estimate, it doesn't matter.
What does matter is how far you are able to drive and how many kilowatts you burn. Keep in mind all of the factors that come into play as well. Sounds normal.
 

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Discussion Starter #9
It's getting cooler in New York this time of year.
So many factors.
Personally, I ignore the V-Estimate, it doesn't matter.
What does matter is how far you are able to drive and how many kilowatts you burn. Keep in mind all of the factors that come into play as well. Sounds normal.
How come I loose actual range just while parked. Only difference in the drive. Basically the same temps, same roads same speed. If I don't park I can go 40ish miles. If I park for a extended period of time I can only go very low 30s for range. Actual driving miles, not guess-o-meter. I'll monitor my kw used in the next few days and I'm going to take another drive after work to get range. When I parked this am it was 61* and I had 32 miles of range. I'll see what I have left and drive the best I can to see how far I can go.
 

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Also keep in mind the range is calculated, it doesn't mean (necessarily) you lost charge. If the charge remained constant and outdoor conditions changed (hotter or colder) the calculated estimate would also change.

Theoretically, that means it's possible to get to work with 10 miles left, get back in the car after work, and the new estimate is 11 miles.
 

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How come I loose actual range just while parked. Only difference in the drive. Basically the same temps, same roads same speed. If I don't park I can go 40ish miles. If I park for a extended period of time I can only go very low 30s for range. Actual driving miles, not guess-o-meter. I'll monitor my kw used in the next few days and I'm going to take another drive after work to get range. When I parked this am it was 61* and I had 32 miles of range. I'll see what I have left and drive the best I can to see how far I can go.
You aren't losing any range. The estimate is changing based on the conditions.
 

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Discussion Starter #12
You aren't losing any range. The estimate is changing based on the conditions.
I am, if I leave home and drive I can go 40 miles at least. If I leave home, park and then drive I can't come close to 40 miles. If I leave work tonight Il be lucky to hit low 30s for miles. But if conditions where the same beside me parking at work I could drive 40-44 miles or a bit more. I've always thought it was normal. The reason for my post is to ask the group if PIC6135A applies as it fits my scenario perfectly and why can't a volt advisor find any information on it.

I'm not basing this purely on the range displayed as I physically can't use the same range and it's affecting by parking for a period of time.
 

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I am, if I leave home and drive I can go 40 miles at least. If I leave home, park and then drive I can't come close to 40 miles. If I leave work tonight Il be lucky to hit low 30s for miles. But if conditions where the same beside me parking at work I could drive 40-44 miles or a bit more. I've always thought it was normal. The reason for my post is to ask the group if PIC6135A applies as it fits my scenario perfectly and why can't a volt advisor find any information on it.

I'm not basing this purely on the range displayed as I physically can't use the same range and it's affecting by parking for a period of time.
So you are basing this on how many miles you've been able to actually drive rather than the estimate, as the original question stated?

What is PIC6135A? I'm not finding any results for that on 'the google'.
 

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This is probably your solution. I had a 2013 with this frustrating issue (BEFORE GM engineers figured out it was a software problem). They had my car for 6 weeks trying to figure it out. This TSB came out, and fixed it right away.

For me, the connection was eventually easy to figure out because it happened right after a dealer visit where the HPCM2 was reset. Did you go to the dealer before this started happening?

 

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Discussion Starter #17 (Edited)
This is probably your solution. I had a 2013 with this frustrating issue (BEFORE GM engineers figured out it was a software problem). They had my car for 6 weeks trying to figure it out. This TSB came out, and fixed it right away.

For me, the connection was eventually easy to figure out because it happened right after a dealer visit where the HPCM2 was reset. Did you go to the dealer before this started happening?
I've only owned it since April. It's happened since the beginning but I thought it was normal. I figured the car was running the HVAC while it was parked until I saw that TSB.

I'll be going to a local dealer tonight that I've been told has a volt specialist. I'm doubtful but we will see.

I hope they gave you a rental.
 

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Not only did GM give me a loaner car, but a $250 gift card for the trouble--I'll never complain about GM customer service. On your car, I bet someone reset the HPCM2 at some point before you bought it and the fix came out. Make sure you give them the code, #PIC6138A. This will take care of it. Shortly after the fix, I started hitting 50+ miles regularly for the first time!
 

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Discussion Starter #20 (Edited)
So I went to the dealer. Said the car had a BCM update but not a battery controlled update within the time period in question and want $109 diag fee because it might not be covered and they will look into it. Can't promise anything but they will look into it.

It's not the car, I love the car. I really do. But I wish I never bought it or trusted GM with my vehicle needs. I'll never own another one. Last experience with a Chevy dealer was the buffeting kit, that took 6 visits to get right. Now a different dealer telling me a voltec computer isn't under warranty.



Too bad I can't go get my truck back. 1264ft lbs at the rear tires. And 26mpg.
 
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