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I don't see the DCM firmware version by the above steps to service model. I can only use TechStream to read DCM firmware version.
2020 XLE Premium dead battery
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HU service menu won't show you the DCM (separate module) firmware version...you need access to techstream & OBD-II tool to confirm version
myang001 nailed this in his post just above
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Odd. Mine does show versions for all 3 of those items.
I also do have TechStream, so will venture in there when I have time to do it.
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My battery died once down to 0 due to my own fault once. Basically i had some sound system things misconfigured whwre they didnt turn off. My innova meter now shows 50 percent sometimes and full one second later. Im getting good volts like 12 to 13 without the engine running. The photos are the volts with with engine running. I am just curious if my battery was damaged and now it only can charge to half capacity based off of what i see a half charge on the tester.
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Bought my RAV4 in May of 2020 and this issue last week. Randomly would get "Battery charging" when the auto start/stop should engage. Noticed one morning that the car was a hair slow to turn over, then the next morning the battery was completely dead despite driving for about 40 minutes in each direction the day before. Had the TSB firmware update applied and it's been gravy ever since.
My 2019 Rav4 with 1500 miles on it has had 3 battery failures in parked overnight garage. Dealer gave battery the a-ok on service call after 1st and 2nd failures (I jump started vehicle each time) and I am interested in dealer's response for my 3rd upcoming service call. All along I've been thinking I might have left some light/device on in the car overnight but lately it appears to possibly be a defective battery instead?
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I have a 2021 Hybrid RAV4 (ordered it end of last year - 4k miles) and it was dead today. I believe it was off for at least 4 days in my garage. 2 days ago, I tried to start it and got an error message about my smart key not working. I tried with the spare key today and it was completely dead. Had it towed to dealership, but I assume I have the DCM update you mentioned since my car is much newer. If the EPKB is not the issue, any other ideas?
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The dealer should be aware of the firmware update that needs to happen (if in fact that is the same issue I had). The problem is the overhead emergency button of the car is always on even when the car is off, and after several days of non-use it drains the battery. The firmware update fixed my problem. Good luck.
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I had the same issue with my 2020 hybrid not long after I got it. Long story short, there is an issue with the communication module that transmits your vehicle stats after you shut down. Sometimes it doesn’t disconnect the cellular link and flattens the battery. There is a software fix, and I would have thought your prime would have had it. I never had the issue again, but nobody from Toyota would tell me what the fix was. I found out through the grapevine. I had the tsb done at my first 5,000 mile visit. The service bulletin doesn’t mention that it cures the problem. It pushes me off that toyota doesn’t tell us customers, 1, what the issue is and 2, what the fix is.
I hope this is the cause of your issue, as it’s an easy fix. I about drive myself nuts trying to figure out what the drain was.
Cheers
John
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The dealer said that I did not have the DCM update and they installed it. They seemed to be aware of this issue and said they have seen it with RAV4s and Camrys and sometimes the battery from the factory needs replacement.
Welcome to the Forum.
@Tazio Nuvolari is familiar with the history of this problem. Am sure he will reply soon.
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T’he problem, which I had with my 2020 limited hybrid, a week or two after I bought it is this: The cellular network did not Disconnect after the vehicle was shut down. After you shut down and park the vehicle, the cellular system transmits all the trip operating data to ‘Toyota. I don’t like that, but it’s what the vehicle does. The problem came because the Cell system failed to basically hang up the cell call after the data was transmitted so it remained active and connected and ran down the 12 volt battery. The firmware upgrade fixed the problem, but nowhere did it identify that this. Upgrade encompassed this fix. I was pissed off the Toyota kept telling me there was nothing wrong when they were already working on a fix and knew what the issue was. What also pissed me off was that after the update, they still never told me it was supposed to fix the problem. I had to find out via other areas.
So if your firmwre is updated to the latest level, you should be good to go. Check your fit ware just as the others above described. You can also go in and check to see if there are any firmware updates available and most can be downloaded by you. I hope this helps.
So if your firmwre is updated to the latest level, you should be good to go. Check your fit ware just as the others above described. You can also go in and check to see if there are any firmware updates available and most can be downloaded by you. I hope this helps.
If indeed your RAV was properly updated with the latest firmware from the Data Communication Module TSB (Technical Service Bulletin) then I think your battery may be internally failing. It's also possible your car simply had a defective battery from the factory. When batteries go completely dead several times it causes chemical changes to the plates and cells. Generally they cannot thereafter fully charge and hold that charge. I would advise you to get your battery tested for free at an Autozone or similar parts store. Its quicker and easier than going to the dealer. If indeed your battery has crapped out then make an appointment at the dealer and insist they give you a new battery--since you have a 2020 its still under warranty. With regards to those people with hybrids and 12V battery issues even after the DCM update I understand that there is some sort of module near the 12V in the cargo area that may fail due to extreme cold weather and cause the battery to die. I don't know any more detailed information on this hybrid problem or the TSB number--search the hybrid sub section.
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I just want to let you know that a lawsuit is about to be brought against Toyota for the battery drain issue. I am affected by it (Toyota performed both DCM software updates and even replaced my battery under warranty but the car is still dead after 3-5 days of not touching it). I have been contacted this morning for details by a lawyer with the law firm in charge of the lawsuit. I am listing below the link to the lawsuit, I know I am not the only one affected by it. My suggestion to the Rav4 owners that think the DCM software updates (T-SB-0021-20 and T-SB-0095-20) solved the battery drain issues: leave you car parked for 4-5 days to confirm that the battery drain issues gone. You might not be aware of the fact that you still have the issue because you drive the car every day:
classlawdc.com
2020 Toyota RAV4 Battery Drain Investigation | Migliaccio & Rathod LLP
Migliaccio & Rathod LLP is currently investigating Toyota for battery drain issues in the 2020 Toyota RAV4. Owners report the vehicle’s battery rapidly drains while the vehicle is off, in as little as 14 hours. Some RAV4 owners have found their batteries depleted after a few days without use and...
classlawdc.com
Good for you !I just want to let you know that a lawsuit is about to be brought against Toyota for the battery drain issue. I am affected by it (Toyota performed both DCM software updates and even replaced my battery under warranty but the car is still dead after 3-5 days of not touching it). I have been contacted this morning for details by a lawyer with the law firm in charge of the lawsuit. I am listing below the link to the lawsuit, I know I am not the only one affected by it. My suggestion to the Rav4 owners that think the DCM software updates (T-SB-0021-20 and T-SB-0095-20) solved the battery drain issues: leave you car parked for 4-5 days to confirm that the battery drain issues gone. You might not be aware of the fact that you still have the issue because you drive the car every day:
2020 Toyota RAV4 Battery Drain Investigation | Migliaccio & Rathod LLP
Migliaccio & Rathod LLP is currently investigating Toyota for battery drain issues in the 2020 Toyota RAV4. Owners report the vehicle’s battery rapidly drains while the vehicle is off, in as little as 14 hours. Some RAV4 owners have found their batteries depleted after a few days without use and...
Recommend you also advertise this on other Toyota forums, Reddit, Google, Yelp, carcomplaints.com, etc.
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To be honest with you, this is the only forum that I have followed since I got my XSE, I'll stick to only letting people on this forum know about it. If anyone else wants to spread the word on other platforms, they can feel free to do so.
@Tazio Nuvolari may want to do this. He is well versed and knowledgeable of Toyota.
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When I took my car in after the battery incident, I was first told that I wasn’t driving it enough, because of the mileage I had on it. I told the tech, “ Oh come on. You mean to tell me that Toyota has produced a vehicle that can’t sit in a garage for 3 days without bein driven or the battery will run down?” I then asked them if they thought their statement might be a little bogus. So they told me they would troubleshoot the car, at my cost, as there was nothing wrong with it. I said they needed to read the warranty information first, and if they chose to charge me, there was going to be big trouble. I finally got the firmware upgrade done, which fixed my issue, but I had to push for it. As I said previously, there was no discussion whatsoever about the upgrade, and I learned about it from other sources.
I had talked to Toyota corporate about the issue several times and got a blank answer, like nobody else had the problem. I installed a blue tooth battery monitor myself, because I was determined to get to the bottom of the issue, and could see I wasn’t going to get much help with it. I think the lawsuit is applicable. If you can’t rely on your vehicle to be ready and waiting for you, you might just as well save your money and not buy a new car.
I had talked to Toyota corporate about the issue several times and got a blank answer, like nobody else had the problem. I installed a blue tooth battery monitor myself, because I was determined to get to the bottom of the issue, and could see I wasn’t going to get much help with it. I think the lawsuit is applicable. If you can’t rely on your vehicle to be ready and waiting for you, you might just as well save your money and not buy a new car.
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