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I got onstar notification on saturday evening that my charging has been interrupted. car was parked in my garage. checking the car, i saw amber color lights!, the range was showing zero. i turned ON the car and tried to shift gear. it asked me to put it back to parking (P) . i couldnt move the car at all. i called onstar and asked to check the diagnostic tests. they ran and gave me the code P1E7F ( HV battery issue) and asked me to take the car to service center in a day. since dealership was already closed for the day, i had to wait until monday morning. got to tow the car to nearest chevy dealer. dealer ran some tests and told me that i had to replace teh HV battery..wow..i got the car in december and had around 7700 miles on it. they gave me loaner car for three days. i got my car back today. as per the work order, they replaced the HV battery.

here is the description:
"internal high voltage battery cell failure. verify code p1e7f-00 for cell 84 checked data in the bcm found. found 84 at 1.68 all other cells at 3.98. called (removed name) case # ( removed ) told they would ship a battery. install new high voltgae battery top off coolant bleed system program becm, hpcm2 and clear all codes and high voltage code, performed battery pacl, capacity learn road test ok at time"

anyone experienced similar problem?
 

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Sounds like a very rare occurance. If they have a battery pack in stock this should be an easy swap. That's the beauty of an EV. Tesla's routinely have their entire Drive Unit replaced and it's a plug and play operation.

Keep us posted.
 

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GM states that their cells from LG Chem are pharmaceutical quality with only 2 parts per million failure rate.

If these numbers are accurate, this should be a rare occurrence (and hopefully so for GM, as the repair sounds expensive).
 

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One cell in the pack? Easy enough to swap out the pack to get you back on the road. GM can then replace the bad cell at its leisure and return the pack to inventory.

Not sure I'm happy with a single cell failure immobilizing the car. Limiting the range and speed, sure. But not immobilizing the car.
 

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Keep us posted.
A single post by the OP. I seriously doubt that they'll 'Keep us posted'.

Might be a case of posting a code and making up the rest. Battery issues are so rare that I'm leaning this way. I also seriously doubt that the tech would be opening the battery and checking cell voltages. At this stage of the game, GM would want want the body in their morgue for full diagnosis.
 

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Aren't these supposed to be modular? I wonder if the whole pack was replaced or just a module? This all starts to become a lot more relevant the day after the warranty expires on an EV.
 

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Might be a case of posting a code and making up the rest. Battery issues are so rare that I'm leaning this way. I also seriously doubt that the tech would be opening the battery and checking cell voltages. At this stage of the game, GM would want want the body in their morgue for full diagnosis.
Why the casual dismissals, DonC and Loboc? Qinsp's math seems sound to me-- at 2ppm cell failure, that's 1 in 2500-ish for the Gen 2s. Or, to put it another way, if 25,000 are sold this year, 10 will have a bad cell. The OP should be getting our sympathy, not skepticism.

He quoted the work order for the cell voltages. If the tech didn't check them personally, wouldn't the car have that information already? Otherwise, it wouldn't have thrown the code, right?

mrrajesh28-- Sorry to hear that you had this problem. Be happy to know that, statistically, it is an anomaly. That doesn't get you your time and inconvenience back, but you can be pretty confident that you won't see this issue again.
 

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Aren't these supposed to be modular? I wonder if the whole pack was replaced or just a module? This all starts to become a lot more relevant the day after the warranty expires on an EV.
That's what I was wondering as well. I would think that it would be preferable to replace only 1 of the 4 modules rather than the whole pack.

But from a quality control and logistical standpoint, GM might prefer to eat the cost of the whole pack rather than risk having a local dealer tech performing a service that is so rare and more complex than simply swapping the whole pack.

For reference, here's a video of a guy tearing down a Gen 1 battery pack. Not super complex, but not super simple either.
https://www.youtube.com/watch?v=00tTckGUv7I
 

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That's what I was wondering as well. I would think that it would be preferable to replace only 1 of the 4 modules rather than the whole pack.

But from a quality control and logistical standpoint, GM might prefer to eat the cost of the whole pack rather than risk having a local dealer tech performing a service that is so rare and more complex than simply swapping the whole pack.
I agree. GM would have the entire pack returned for disassembly and evaluation at their battery labs. The dealers don't have the knowhow or tools to replace a module or a cell, and both take more time than just replacing the pack. But I wonder why the pack replacement took three days. Maybe they had to order and wait for the replacement pack, and this means that the dealer never has a replacement in its local inventory.

Anyway, GM has done its job to fulfill the warranty repair at no cost, just lost time for the Volt owner.
 

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But I wonder why the pack replacement took three days. Maybe they had to order and wait for the replacement pack, and this means that the dealer never has a replacement in its local inventory.
Yeah, I'm pretty certain no dealer would stock a 400-ish lb battery pack on the off-chance that a local Volt owner needs a pack replacement -- especially given the low failure rate and the relatively small vehicle population for Gen 2 Volts. Waiting only a few days isn't so bad for such a big part to be delivered IMO.
 

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Discussion Starter #13
OP here. sorry for late replies. since this was my first post, I had to wait for moderator to approve it, and I couldn't check the forum yesterday.

It is good to know that the single cell failures are very rare. Everything is working fine for past two days. GM and dealer were very helpful. they even promised to reimburse for the gas for these 3 days ( ~18$) that I haven't claimed yet!

After the new battery pack was installed ( before full charge), the range and % of charge it showed on dashboard was 36 miles. I picked up the car from dealer before it got fully charged. I thought they replaced with 2015 model battery. but the service advisor assured me that it is the new 2016 model battery pack. anyway, after the first full charge, everything (RANGE AND CAPACITY) showed correctly.

thanks for the community that I didn't know about until I got into this issue.
 

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Discussion Starter #14
Not sure I'm happy with a single cell failure immobilizing the car. Limiting the range and speed, sure. But not immobilizing the car.
Yes. i was not happy either that. also, the car goes to service mode after which you cannot turn off car as well. you need to open the door after pressing the power button or hold it for a few seconds to power off that i didn't know before.
 

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A single post by the OP. I seriously doubt that they'll 'Keep us posted'.

Might be a case of posting a code and making up the rest. Battery issues are so rare that I'm leaning this way. I also seriously doubt that the tech would be opening the battery and checking cell voltages. At this stage of the game, GM would want want the body in their morgue for full diagnosis.
sorry, i didn't know about the community until the issue happened. i searched the web and didn't get any hit for the P1E7F code. since it was my first post, moderator needs to approve it and i couldn't login yesterday. anyway, GM didn't take the body for diagnosis. it is working fine now.
 

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Discussion Starter #16
mrrajesh28-- Sorry to hear that you had this problem. Be happy to know that, statistically, it is an anomaly. That doesn't get you your time and inconvenience back, but you can be pretty confident that you won't see this issue again.
Thanks. ya, hope so it wont come back
 

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Discussion Starter #17
Yeah, I'm pretty certain no dealer would stock a 400-ish lb battery pack on the off-chance that a local Volt owner needs a pack replacement -- especially given the low failure rate and the relatively small vehicle population for Gen 2 Volts. Waiting only a few days isn't so bad for such a big part to be delivered IMO.
Dealer initially told me that it will take a few days, but they replaced it in 3 days which is awesome. the only thing that i missed in those 3 days was access to HOV lane for my commute to work. btw, i am seeing a lot of Gen 2 Volt cars here in Bay area in California.
 
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