12v issues (both needed replacement)

[GatorRiv]

I posted in a different thread about my truck needing both 12v batteries replaced last Friday. This morning the car flashed up fresh "replace 12v battery" warning so it is back in shop.

Any thoughts on potential cause? Vampire drain?

I feel like 90% chance they tell me the batteries are testing well and to go on my way. Hard to trust though given how bad the sudden and complete failure was last week.

I simultaneously have a Bluetooth error and failure of the key card system.

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[Dark-Fx]

Are you on 2024.07 software? They supposedly tuned those error messages in that update. Seems like you probably have some hardware that's going bad that they'll have to replace if the message isn't erroneous.

 

[GatorRiv]

Are you on 2024.07 software? They supposedly tuned those error messages in that update. Seems like you probably have some hardware that's going bad that they'll have to replace if the message isn't erroneous.

Thanks. Yes, on 2024.07.03 and I laughed when I saw 12v notifications as the last item on the enhancement list given 2 days before I had total loss of 12v without warning and car was totally bricked.


I was half wondering if they over tuned the notifications and this was phantom but it immediately returned after a hard reset. I am at least thankful for that given if was much easier to deal with problem from my driveway than on I-95.

 

[ads75]

I would guess the techs will take a much closer look given its the second time this has happened to you in a short period of time. Its an easy first reaction to just replace the batteries the first time, especially with how many of us have had the 12v batteries die (not just Rivian, other EVs also). Its something else if they die a second time that soon.

 

[R.I.P.]

On down the troubleshooting tree...

1. Replace the battery (s)
2. Check the charging system. In this case, the DC to DC converter.

 

[GatorRiv]

On down the troubleshooting tree...

1. Replace the battery (s)
2. Check the charging system. In this case, the DC to DC converter.

I should have added that the warning said replace 12v and also "failure to do so may result in loss of range".

I thought that was a strange addendum. Range is the last thing I'm worried about.

 

[EBEG]

I posted in a different thread about my truck needing both 12v batteries replaced last Friday. This morning the car flashed up fresh "replace 12v battery" warning so it is back in shop.

Any thoughts on potential cause? Vampire drain?

I feel like 90% chance they tell me the batteries are testing well and to go on my way. Hard to trust though given how bad the sudden and complete failure was last week.

I simultaneously have a Bluetooth error and failure of the key card system.

I had the same issue and my batteries were replaced by mobile service last month. My tech told me it isn't uncommon for the batteries to simply wear out after about 18-24 months. I've had my R1T for about 18 months. He hinted that next time the replacement won't be free.

 

[Budman]

What is the collective wisdom of the group here regarding preemptive 12v replacements? I’m at 20 months and 40,000 miles. I’m thinking about doing it before a big July road trip.

 

[KootenayEV]

I posted in a different thread about my truck needing both 12v batteries replaced last Friday. This morning the car flashed up fresh "replace 12v battery" warning so it is back in shop.

Any thoughts on potential cause? Vampire drain?

I feel like 90% chance they tell me the batteries are testing well and to go on my way. Hard to trust though given how bad the sudden and complete failure was last week.

I simultaneously have a Bluetooth error and failure of the key card system.

I agree with @R.I.P. above. My 12v failed, they replaced it, had a problem again within a few weeks and I brought the truck into a SC where they replaced the DC/DC converter (and also checked for bad grounds etc). This was 2.5 months ago.

 

[NY_Rob]

What is the collective wisdom of the group here regarding preemptive 12v replacements? I’m at 20 months and 40,000 miles. I’m thinking about doing it before a big July road trip.

They are designed to last for years as long as they are not abused (over charged, under charged, drained too deeply, overheated, etc... ). As long as your vehicle is charging them correctly they should still be in great shape, I wouldn't replace them till they give you issues.

 

[R.I.P.]

They are designed to last for years as long as they are not abused (over charged, under charged, drained too deeply, overheated, etc... ). As long as your vehicle is charging them correctly they should still be in great shape, I wouldn't replace them till they give you issues.

There is mounting evidence that this is the problem; The Rivian systems are not properly maintaining the 12 volt battery, and they are wearing out prematurely.

 

[NY_Rob]

There is mounting evidence that this is the problem; The Rivian systems are not properly maintaining the 12 volt battery, and they are wearing out prematurely.

Agreed, last time I went in to the RIDE menu I was surprised to see my 12V batts up in 14.5V territory which is okay for recharging after a discharge, but that's too high for a 24/7 float charge on a 12V AGM battery.

 

[Steve A.]

What is the collective wisdom of the group here regarding preemptive 12v replacements? I’m at 20 months and 40,000 miles. I’m thinking about doing it before a big July road trip.

Consider yourself lucky. Both mine just failed last night after only 8 months and ~25k miles. We're all just playing the 12V battery bad batch game of roulette at this point. Thankfully, I was just at work and not on a road trip.

 

[Steve A.]

Are you on 2024.07 software? They supposedly tuned those error messages in that update. Seems like you probably have some hardware that's going bad that they'll have to replace if the message isn't erroneous.

Yeah I got that update last week and this week I got that message w/ ZERO warning as both my 12V batteries died and bricked my R1S. Not exactly helpful.

 

[Budman]

There is mounting evidence that this is the problem; The Rivian systems are not properly maintaining the 12 volt battery, and they are wearing out prematurely.

I wonder if there is a correlation between vehicles with large vampire drain and probability of 12v failure? My R1T has always had vampire drain on the low end of reports, about 1/2% per 24 hours.

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