I didn't go through the whole thread, but I'm a bit skeptical about that first post. Regen effectiveness has always been related to the speed that you travel, because higher speeds require more shedding of energy to slow down. For example, you need a lot more energy fed into the battery in order to slow from 70 to 60mph than you do from 30 to 20. So at freeway speeds regen always seems less effective than it does at slow speeds.

I suspect there's a bit of hypochondria going on there. Maybe he drove the car with a full charge for the first time in quite a while and didn't realize that you don't get much regen when the battery is full.

 

I strongly suspect this is just the normal reaction of greatly reduced regen when the battery is charged to 100%. It always briefly surprises me on the rare occasion that we charge to 100%. Keep in mind that unless you need the maximum range it's best to not charge to 100% even though it is safe to do so.

It's definitely not caused by being 100%. And that guy saw Sean Nelson's response and was quite offended.

Yes, please read the link before dismissing it. They specifically state ~50%. There is lot of room and plenty of examples of dealers neglecting steps of the recall. Many are having to take their vehicle back because the dealer did not follow the proper vacuum fill procedure for the battery coolant.

A very different problem but my own 2018 that got its new battery just before Christmas frequently sticks at 31kw dcfc until I unplug and replug into the dcfc station and then it instantly jumps to 45-50kw.

Yes, and please read all the comments on Reddit too.

 

I read on another forum (french speaking, in Quebec) that recall N212345750 is NOT to be done after you had your new battery...
Nouvelle mise à jour - Post changement de batterie - Menu principal - Forums AVÉQ

What it essentially says is "This update is ONLY and EXCLUSIVELY for 2017-2019 Bolts that DID NOT get their new battery. If your battery was replaced, this update does not apply to you".

The guy who wrote this is a Chevrolet tech working at a dealer in Quebec. I would trust what he says.
They may not be able to "undo" a software update but I would hope they could overwrite it with whatever is appropriate..

 

I'm guessing a phone call to EV concierge will get this fixed. Just tell EV concierge "Hey, these guys installed an update that doesn't apply to me!" They do work with stubborn GM dealers to get things done.

 

It would be worthwhile to do a two car comparison. I just had my battery replaced, but no change in behavior to report. Unknown if any software changes were installed.

 

I had that error but not after battery replacement. It was a contactor inside the battery casing. Not sure if that will be the same in your case.

Error code P0AA1 00

So just an update on my new software update. My Bolt had a P0AA1 00 code and the service advisor told me GM told them to swap my battery with another Bolt on the lot. Seems they did not do that. Instead, they replaced contactor inside the battery disconnect relay. Sounds like the disconnect...

www.chevybolt.org

 

Over on … folks are reporting that Regen and L mode are working poorly with the new battery and the P0AA1 fix (limit high inrush current); anyone here seen anything like that here?

Nothing like it, the regen works just fine. I had my battery swapped in December and nothing abnormal.
There is an update that looks like it affects some 2019, but it’s not showing up on my 2019.

@dborn The recall N212343881 is the battery change. So the patch, as described in the file above, is for some 2019 that had their battery changed but the Advanced Diagnostic Software package wasn’t installed.

 

I strongly suspect this is just the normal reaction of greatly reduced regen when the battery is charged to 100%. It always briefly surprises me on the rare occasion that we charge to 100%. Keep in mind that unless you need the maximum range it's best to not charge to 100% even though it is safe to do so.
EDIT: After reading more closely it sounds like whatever is going on is not due to the battery being fully charged.

 

I’ve seen this thread on Reddit and I don’t think the owners are having the issue while fully charged. One specifically says 50%.

 

Yes, please read the link before dismissing it. They specifically state ~50%. There is lot of room and plenty of examples of dealers neglecting steps of the recall. Many are having to take their vehicle back because the dealer did not follow the proper vacuum fill procedure for the battery coolant.

A very different problem but my own 2018 that got its new battery just before Christmas frequently sticks at 31kw dcfc until I unplug and replug into the dcfc station and then it instantly jumps to 45-50kw.

 

I have belatedly come to the conclusion that they've changed the programming for L mode on my 2019, post-recall. It is still reasonably effective, but it take longer to kick in (less jerky) and is probably not quite as strong. I'd say at 20mph, it makes a difference of at least 10-15 feet in stopping distance. The most obvious example of this is that the cross-walk near my home where I would routinely come up 10+ feet short I now routinely have to tap the brake to avoid ending up over the line. And that's true regardless of whether SoC is 80% or 30%.

On the whole, it's not as good for stop-and-go driving. I used to be able to get away with no brake-pedal use at all and that's simply not the case now. For general highway driving though I don't really notice the difference.

 

I now routinely have to tap the brake to avoid ending up over the line.

Do I recall a discussion where being in L1, using the paddle or using the brake all control the amount of regen up to 100%?
If memory serves the outcome of that thread was physical brake calipers do not receive brake fluid pressure until regen is maxed out.
If true then I agree that reducing the regen amount from releasing the accelerator pedal or pulling the paddle only causes the inconvenience as @greendave indicated he now needs to move his foot to the brake pedal where he didn't before?

 

Great video @GJETSON thanks for sharing.
To summarize the video

 

My experience is similar to greendave's --Regen just doesn't seem to stop my 2017 Bolt as quickly as it used to. I find that I have to use the paddle boost far more frequently than I used to, and even then have to use the brake pedal on occasion, which never used to happen. My impression is that it happened after the firmware upgrade that was supposed to fix the battery fire problem (but didn't), and that the regen did not go back to its original strength after my battery was replaced. I leave my car in hilltop reserve mode, so it's not a case of regen being curtailed because my battery is at 100%.

I have no hard data to prove the effect is real, just the fact that like greendave, I keep finding myself having to use the regen paddle, or even the brakes, in situations where in the past, modulating the accelerator pedal was all I needed to do to bring the car to a smooth stop (or down to the desired entry speed for a corner). I expect over time I'll recalibrate to the new regen level, but for the moment it is a bit of an annoyance.

 

My experience is similar to greendave's --Regen just doesn't seem to stop my 2017 Bolt as quickly as it used to. I find that I have to use the paddle boost far more frequently than I used to, and even then have to use the brake pedal on occasion, which never used to happen.

The problem with this kind of complaint is that it's so subjective that it's difficult to take seriously. Try this:

Find a quiet parking lot somewhere that's on level ground, accelerate to a steady 30mph in "L", and at some some fixed point release the accelerator pedal and let the car come to a stop without touching anything. Measure the distance from where the car stopped to where you released the accelerator pedal. We can compare this test with others who are willing to do the same thing to get some objective data on the issue.

Be sure to do this with the battery at less than 90% state of charge so that the car doesn't limit the regen amount.

Hint: To make the length measurement easier, do it at right angles to the marked parking stalls - if you measure the width of one stall you can count the number of stalls you traveled and multiply by the length of each stall for a quick estimate of distance.