dan1520

Check out my last response where go through the electrical problem on my 2020 300h. You will note that it was the battery even though they "checked it" three times. When there is corrosion on a brand new battery terminal there's a problem with the battery. It's been a while now and all appears to be ok.
My suggestion, try a new battery. Don't just go by their "battery testing". Replace it is the best way to go.

Travnurse

Yep. Happened this morning on my wife's brand new ES300h. Would not crank, though you could see it had power (lights on). Left, and came back 1-2 hours later. Started right up. They have an issue they need to fix, This should not happen. And she drives it every day. Even if a small battery, it should NOT run down for weeks. Unless it is a piece of crap.

dan1520

It was finally resolved. Turns ou that the problem was I first said it was after the first time it went back. When I noticed that the 12 volt battery had corrosion on the positive connection, I knew that theproblem was the battery. I mentioned it to them but they still attached computers, new softwars, etc., instead of fixing the most logical reason for the problem. Three visits later, they changed the battery and have not had a problem since.

Go figure!!!

Wihunge

I go weeks without driving my 2020 es hybrid. Never a problem starting it. I have 2,000 miles on it. The car is in a garage here in California’s Central Valley where it rarely dips below 67 at night and is around 100 durning the day. Don’t know if that has a bearing on a battery drainage problem or not.

losiglow

I routinely leave my 2017 at the airport for 5-7 days (including Utah winters) and it always starts without a problem when I get back. Different generation but the drivetrain and all seems pretty similar to the current gen.

Not surprised it turned out to be the battery. The owners manual makes it pretty clear that if the 12V battery is having problems that it's very likely you'll encounter starting issues.

IanNY

Hi dan1520,

I am so glad to find your thread yet not. I have a 2016 ES300h and about 110,000 miles on it. Just 4 days ago (1/8/22), I had my first experience of not being able to start the car. On that occasion, I had driven more than 1 hour on the thruway. Parked the car for about an hour. When I tried to leave. The "Ready" light would not come on. All other lights and indicators came on as usual. The map was working too. After a minute or two of trying, I was able to restart and drove off. Thinking that the 12 V battery was the culprit. I researched a little and discovered that there is no good alternative to the OE version.

Subsequent day was a Sunday. The same thing happened again, but I was able to restart after a few attempts. On Monday, I had mechanic test the battery and he suggested that I replace it. So I was going to get the battery from the dealer (almost $400). Then I encounter another occasion that the "Ready" light wouldn't come on. On that occasion, I was fortunate that a kind person helped jump the car. Thinking that would start it up. No luck. It was again a good 15 minutes or so of retrying with the jumper cable connected and the jumper car's engine revved up. Finally the Ready light came on.

This morning (1/12/22) I replaced the battery at the dealers, and immediately after that, I couldn't start the car again. They took it in and could not find any fault codes or anything suspicious. So that tells me that the battery doesn't seem to be the reason.

Ultimately they suggested that I remove the Allstate insurance Drivewise device that is plugged in to the OBDII socket and see if the problem recurs. 4 hours at the dealer, they were kind enough to not charge me the diagnostic fee, still no concrete solutions.

Anybody has any other ideas? Thank you so much.