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10 day old 2020 XSE with 380 miles and my battery died after 3 days in my garage without use. Jump-started from under the hood with a battery pack and started up with no problem. Drove to the dealer today and they initially said no problems. I insisted that they keep it overnight and test again in the morning. I can deal with the fuel tank issue but if this keeps happening, I may be getting rid of this thing. I'll update once back from the dealer.
 

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CRV's and other Honda's had a run on this problem in recent years. As I recall, it was a parasitic draw problem. Battery would be drawn down but was fine when charged up--until it happened again. Something that was supposed to shut off when the engine was shut down did not. It wasn't something that you manually turn on/off. The fix was a software update.

I think it was not easy to diagnose, there were lots of complaints about it before it was figured out from what I read.
 

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Experienced the same thing. Went on vacation for about 7 days, came back and car wouldn’t start. I have 7k miles on it.
 

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Is this issue on 2020 only? Canadian? They did add the auto shut off feature for 2020 could be as a result of that. I came back after two weeks and my car started fine.
 

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No aftermarket stuff in my 2020 XSE. 1700 miles on ours with no issues then this. I hooked a jump box up to the terminals under the hood at it read 6 volts coming from the starting battery. That’s a significant drain. Something must be drawing on that battery after shutdown.

This is not a minor issue. Yeah, you can buy a jump pack but it’s absurd to need one.

Doubtful this is a battery problem. Fires up easily with a jump box and after driving just 10 miles it had no trouble starting on it’s own.

If it happens again, I’m going to check the voltage at the battery itself before jumping it. Might tell us if it’s something in between.
Is your alternator charging ok?
 

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It's happening to all the 2020 Hybrids, not sure about the 2019 models. There's something that's coming on, or never going off that will drain the puny Aux battery. It's probably a software fix that needs to be implemented. The charging is done by a DC-DC connection via the main hybrid drive cells (no altenator in a hybrid). I've checked my voltages while it's "running" and the charge voltage is fine (roughly 14.5v). I've started puting a battery tender on it once a week, but shouldn't have to go through BS like that. It's not like it's a Jaguar or Benz. I know it will still happen again if I let the car sit for a day or more. This is pathetic. Long time Toyota owner, maybe not for much longer after this. I have a case open with Toyota (twice), and have started the lemon-law paperwork. Toyota needs to fix this! All I can tell folks is to open a case with Toyota, and tell them you'll stop buying their brand if they don't remedy the problem.
 

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I posted on the dead battery chain, but I’ll post here too in case you aren’t on that thread...

Alright guys, add my 2020 XSE Hybrid to the list. It was built in Japan end of Oct. and I received it 11/21. My first dead battery was 1/17 and Toyota replaced the battery completely and told me I had probably left something on. I now double check every night to make sure nothing is on. Fast forward to 2/23 and my battery was dead again. I suspected that an accessory wasn’t powering down properly so I turned off everything before I turn the car off and unplug my aux cord. Today (2/27) the battery was dead again. It is now at Toyota for an extended stay as a tech tries to figure out what the issue is. The dealership thinks it could be a computer malfunction.

A couple things to add- the outside temperatures have been extremely different every time but never below 50 degrees. Also, the first two times the car hadn’t been driven in about 18 hours, but this last time it had only been a 10 hour span.
 

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Something is draining the battery at different intervals. It was found out that the 2017 Honda hybrid, with the same problem, had a "stabilization system" computer not going off after many many complaints from owners. A software update fix that.
But what is different from the 2019 hybrids... never heard of the 2019 12v going dead. My 2016 Sonata hybrid sits for a week, no problem and nare a problem with my 2019 Rav4 hybrid.
If they "Amp check" the battery, that would find any single dead cell.
 

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Have had my 2020 XLE Hybrid for about 2 months. On 2 different occasions the car would not start due to the battery being drained. Dealer kept the car for 4 days each time and could not find the issue. Car was definitely turned off, all lights off, and keyfob was not left in the car. Is anyone else having this problem?
 

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Bought mine 2/15 And it wouldn’t start today. Had to be jumped. Brought straight to the dealer and both batteries were fine. They said maybe the door didn’t shut right...looked shut.. 2019 have a problem with the drivers side door not shutting right. Push it.... how
 

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FWIW: RAV4 Interior (dome) lighting is on a circuit that will auto-off after @20min if working correctly...
My battery drained one time even though I had all the lights shut off. I make sure all lights, interior and exterior are off before I walk away.

Sent from my SM-A102U using Tapatalk
 

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Discussion Starter #36
I posted on the dead battery chain, but I’ll post here too in case you aren’t on that thread...

Alright guys, add my 2020 XSE Hybrid to the list. It was built in Japan end of Oct. and I received it 11/21. My first dead battery was 1/17 and Toyota replaced the battery completely and told me I had probably left something on. I now double check every night to make sure nothing is on. Fast forward to 2/23 and my battery was dead again. I suspected that an accessory wasn’t powering down properly so I turned off everything before I turn the car off and unplug my aux cord. Today (2/27) the battery was dead again. It is now at Toyota for an extended stay as a tech tries to figure out what the issue is. The dealership thinks it could be a computer malfunction.

A couple things to add- the outside temperatures have been extremely different every time but never below 50 degrees. Also, the first two times the car hadn’t been driven in about 18 hours, but this last time it had only been a 10 hour span.
This disproves my theory that it was just the 2020 Hybrids built in Canada
The Toyota specialist came down and found nothing wrong with my 2020 Hybrid XLE. The TAS case was 200270499
The 2017 Honda CRV had a similar issue and it ended up being something with the electronic parking brake. Good luck and let us know if they find anything.
 

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This disproves my theory that it was just the 2020 Hybrids built in Canada
The Toyota specialist came down and found nothing wrong with my 2020 Hybrid XLE. The TAS case was 200270499
The 2017 Honda CRV had a similar issue and it ended up being something with the electronic parking brake. Good luck and let us know if they find anything.
That’s very interesting you mentioned the electronic parking break being the issue in the CRV. This morning when it was dead it flashed “parking break unavailable” over and over. It also did this the first time. I will mention it to the tech. Thank you!
 

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Bought mine 2/15 And it wouldn’t start today. Had to be jumped. Brought straight to the dealer and both batteries were fine. They said maybe the door didn’t shut right...looked shut.. 2019 have a problem with the drivers side door not shutting right. Push it.... how
Hi Joanie, are you saying you purchased yours in 2/15/19 or 2/15/2020? Was wondering if it was a 2019 left on the lot that you purchased this year in February. Thanks!
 

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My 2019 LE hybrid has not had this issue and I don’t recall hearing of any 2019s that do.
My LE sits a lot (5-7 days) between drives as I’m purposely keeping mileage down.
 

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Just happened to be in my garage around midnight. Something is definetely coming on and is what most likely is causing the drain. I could hear a pump type sound running on it's own. Car had been turned off and locked for several hours. To rememdy I just restarted it and let it run for a few minutes. Shut it down and relocked it. Pump sound no longer there. I'm sure it's a software malfunction of sorts that is causing this, and possible other things to turn on when they shouldn't and cause the drain on the tiny aux battery. So much for that Toyota reliability I've known for years. Not happy with the lack of interest from Toyota in fixing this. I've seen on here that a 2020 non-hybrid owner has the same issue. I'm sure the problem is on those as well, but it's just not going to show up as often because the non-hybid would have a much larger capacity (normal) battery and can handle the drain better.
 
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