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Re: RECALL

Posted: Sat May 08, 2021 10:15 pm
by marspilgrim
Maybe, but what does that get you? You still need the service department to run the diagnostics first before the update is applied. I for one plan to drop my 2017 off with about 45% charge and let them check it all they want so they find as many bad cells as possible if there are any.

Re: RECALL

Posted: Sun May 09, 2021 2:39 pm
by trevmar
I don't see the significance of the 80mV drop. Why not 79 or 81mV?

Or 5mV?

Cells made at the same time from the same raw materials should all have the same OCV IMO

And it would be better to know which way the OCV is trending over time, rather than just relying on one reading.

In my book, a battery with 12.8 volts OCV that is still showing 12.8 a week later is healthier than one that gives 12.95 today and 12.75 a week later

Re: RECALL

Posted: Sun May 09, 2021 4:02 pm
by wwhitney
marspilgrim wrote:Maybe, but what does that get you?

Some peace of mind as to the urgency of the recall work. Also, an expectation as to whether the work will just take 1-2 hours, or whether you'll have to leave the car there longer.

Cheers, Wayne

Re: RECALL

Posted: Tue May 11, 2021 10:09 pm
by marspilgrim
As to the urgency, since there was just another fire supposedly with the temp fix in place, I'd get it scheduled the moment your model year can be worked on.

From what I've seen in some posts, it appears to take a few hours for the diagnostic tool to run so if there are no issues with the pack expect half a day. If bad cells are found then it could be a couple days depending on parts availability but they are supposed to provide a loaner if needed. I would guess that even if there is no issue, that whatever the book time is that the dealer will use all of it for some extra income from GM.

Re: RECALL

Posted: Tue Jun 01, 2021 2:01 am
by cwerdna
As I posted at MNL but with some minor edits:
The final procedure for covering all the recalled vehicles (all '17 and '18 + subset of '19) is up at https://static.nhtsa.gov/odi/rcl/2020/R ... 1-3618.pdf. As usual, there was a lag before appearing at NHTSA. The '17 and '18 final remedy came out on 5/26.

https://www.nhtsa.gov/vehicle/2017/CHEV ... WD#recalls grew from 29 to 34 associated docs sometime a few days back.

https://gm-techlink.com/?p=14834 explains the new DTC and diagnostics.
trevmar wrote:I don't see the significance of the 80mV drop. Why not 79 or 81mV?

Or 5mV?

Cells made at the same time from the same raw materials should all have the same OCV IMO

As a Leaf driver who can see voltages including the delta between min and max cells or modules via Leaf Spy, there's always a bit of imbalance, but they're under some load when the car's on in READY mode. Max delta is usually no more than 20ish or 30ish mV, IIRC and sometimes in the single digits.

https://www.mynissanleaf.com/viewtopic. ... 64#p457964 was an example of a Leaf w/a bad module showing 164 mV delta between min and max at pretty low SoC. In Leaf-land, Nissan has a CVLI test: https://www.mynissanleaf.com/viewtopic.php?t=16070.

I've never run my Leaf to super low but the author of Leaf Spy told me about the delta being hundreds of mV when his '11 is close to dead: https://www.mynissanleaf.com/viewtopic. ... 52#p516652.

I think it's a good guess that GM believes these diagnostics and thresholds + new/updated DTCs are sufficient to identify cells w/latent defects (alluded to near the end of page 1 of https://static.nhtsa.gov/odi/rcl/2020/R ... 1-7407.PDF).

Re: RECALL

Posted: Wed Jun 09, 2021 5:49 pm
by trevmar
Since "The '17 and '18 final remedy came out on 5/26." I have heard nothing from GM, yet previously I got many notifications about the 90% charge limit recall for my 2017 Bolt

Anybody else been contacted yet?

Re: RECALL

Posted: Sat Jun 12, 2021 11:16 pm
by cwerdna
If you haven't gotten snail mail, you should be able to put in your VIN into https://www.nhtsa.gov/recalls and https://my.chevrolet.com/recalls to check about your open recalls. All '17 and '18 Bolts + a subset of '19 were under the potential fire battery recall. There's no need to wait to be contacted.

There are plenty (35+) associated docs at https://www.nhtsa.gov/vehicle/2017/CHEV ... WD#recalls for this recall.

Re: RECALL

Posted: Mon Jun 14, 2021 7:20 pm
by marspilgrim
Yes, I just made an appointment at the area Bolt-certified dealer but then got my notice in the mail a few days later. They're working on it today.