Loss of regen: Below 70% SOC

[jebinc]

Hello all. I noticed regen “gives up” after a few heavy uses or going down a longer steep hill. SOC in the low 60’s, so not that. Battery warm, so not that either.

It’s as if it “gives up” for some reason, like heat, after more than occasional use. Anyone else notice this? Has anyone reported it to Rivian? What does service say about this?

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[jjswan33]

I have noticed this multiple times after extensive regen braking over a short period. Comes back pretty quick in my experience so never thought much about it.

The motors do top out at over 600kW not sure how much of that gets tapped for regen but I could easily see it overheating the system.

 

[jebinc]

I have noticed this multiple times after extensive regen braking over a short period. Comes back pretty quick in my experience so never thought much about it.

The motors do top out at over 600kW not sure how much of that gets tapped for regen but I could easily see it overheating the system.

It’s kind of lame. Never had this issue with our three Teslas. We have a lot of hills here. The other day I was just doing down one normally and it just “broke free” forcing me to look for the brake is a hurry. Not acceptable.

 

[Hyro]

Chiming in as I have not had this experience. I would think that this would be uniform across the trucks, but we've seen so much other things vary that it might be worthwhile doing a poll.

At ~4k' on the ODO on my R1T. Did a California Lost Coast trip about a month ago, there are some sections with non-stop hard regen (on gravel or busted up asphalt) and the regen stayed super strong throughout (high regen).

I've also done an amount of longer stretches (45 minutes +) high-speed spirited driving, hard acceleration, hard regen, back and forth... I figure that would tax the cooling capacity of the motors pretty hard. Incredibly pleased with the truck!

FWIW, I've got "a good one", VIN 59xx. Only issue is slight wind noise from the drivers side.

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[PoorDick]

I've had my truck since last March, but had a new experience just this week. We live up in the mountains around Vail, and have a 3-mile, 1,100 foot drive down to the valley floor each time we leave the house. I always charge to 70%, and usually have 71% at the bottom of the hill, using regen the entire way down. But this time, just after leaving the garage, I received the "Regen limited due to battery level" (or something like that) and had to use the brake all the way down. Once I accelerated again, the regen returned. Only happened the one time (I'm on 39.3), but feel sure it has to do with the latest software update. Not a big deal, I suppose, but can be a bit unnerving when I'm so used to OPD already.

 

[jebinc]

I've had my truck since last March, but had a new experience just this week. We live up in the mountains around Vail, and have a 3-mile, 1,100 foot drive down to the valley floor each time we leave the house. I always charge to 70%, and usually have 71% at the bottom of the hill, using regen the entire way down. But this time, just after leaving the garage, I received the "Regen limited due to battery level" (or something like that) and had to use the brake all the way down. Once I accelerated again, the regen returned. Only happened the one time (I'm on 39.3), but feel sure it has to do with the latest software update. Not a big deal, I suppose, but can be a bit unnerving when I'm so used to OPD already.

I just opened a service ticket…

 

[godfodder0901]

It’s kind of lame. Never had this issue with our three Teslas. We have a lot of hills here. The other day I was just doing down one normally and it just “broke free” forcing me to look for the brake is a hurry. Not acceptable.

I've had this issue a few times, but only on the newest software. Truck is in the shop getting the AXM replaced. Will see if it still does it when she gets back.

 

[jebinc]

I've had this issue a few times, but only on the newest software. Truck is in the shop getting the AXM replaced. Will see if it still does it when she gets back.

AXM?

Yeah, started noticing it lately, since it’s visit to the SC.

 

[Thedude]

It’s kind of lame. Never had this issue with our three Teslas. We have a lot of hills here. The other day I was just doing down one normally and it just “broke free” forcing me to look for the brake is a hurry. Not acceptable.

Those sneaky dicks, hiding the brake pedal where no one would think to look for it.

 

[jjswan33]

I've had this issue a few times, but only on the newest software. Truck is in the shop getting the AXM replaced. Will see if it still does it when she gets back.

FWIW I did have this happen a couple times back in June in SE Oregon, both times coming down the hill near Frenchglen. Of course that doesn’t mean they didn’t tweak the settings during the most recent update.

 

[Dark-Fx]

Battery warm, so not that either.

A "warm" battery is 70F+. I'm not aware of any information the truck gives that shows what the temperature of the battery is. Extreme cold will limit regen and power, but mild cold will still end up limiting regen. I think Rivian just needs to tune their messaging/display since the reduction isn't truly due to a high state of charge.

 

[jebinc]

A "warm" battery is 70F+. I'm not aware of any information the truck gives that shows what the temperature of the battery is. Extreme cold will limit regen and power, but mild cold will still end up limiting regen. I think Rivian just needs to tune their messaging/display since the reduction isn't truly due to a high state of charge.

First, no need to be a Rivian apologist. I love the product. Second, I mean warm as it had just finished charging and I was driving for a while. Third, as I said, not limited regen, but rather full regen that “gives up”…..

 

[godfodder0901]

AXM?

Yeah, started noticing it lately, since it’s visit to the SC.

It's the central module that runs nearly everything (according to service advisor). All of my screens went blank, and I had gotten some random HV battery and turtle mode warnings the day before. Said they could all be related.

FWIW I did have this happen a couple times back in June in SE Oregon, both times coming down the hill near Frenchglen. Of course that doesn’t mean they didn’t tweak the settings during the most recent update.

The most troublesome part for me is that both times there was no audible or visual warning other than the hash marked lower section of the regen/throttle gauge, which is really hard to notice in your periphery. No warnings of limited regen presented at any time.

 

[Dark-Fx]

First, no need to be a Rivian apologist.

Lol, K. Welcome to my ignore list. Guess I'll "give up" trying to help you

 

[jebinc]

It's the central module that runs nearly everything (according to service advisor). All of my screens went blank, and I had gotten some random HV battery and turtle mode warnings the day before. Said they could all be related.

The most troublesome part for me is that both times there was no audible or visual warning other than the hash marked lower section of the regen/throttle gauge, which is really hard to notice in your periphery. No warnings of limited regen presented at any time.

Looking forward to what the SC tells you about this matter!

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