2017 Toyota Highland Hybrid - dash lights going crazy and won't start

I’m having the same problem. Have you gotten an answer yet?

Yes. I took a stab and just brought the battery (reg not hybrid) to a battery shop. They sat it on the charger over night and it has been perfect. Not sure why it was low, we hadn’t used the car in just a couple days, and have left it for a few weeks before, but apparently sometimes hybrids drain it quickly if you don’t use them.)

I had this problem last night. We followed the jump-starting instructions in the manual and it started up just fine after that, and it's been fine all day today on various trips.

I had the same problem. But my issue is a bit different. I parked my vehicle in car storage for 3 months for the winter. After 3 months It started fine, then drove for 5 hrs. The next day it wouldn’t start. All the lights, windows, back door and everything in the dash was functioning. I call fro road assistance for boosting. I brought it to dealership and explained what the problem was. The mechanic told me these new vehicles have so many modules that drains the battery overnight and it didn’t charge up during that 5 hour duration. I found it weird. I would think the battery would have had enough to charge all the cells in the battery. I will ask more questions. I’m told these new vehicles are all like that. Well I just spent 52,000 on this new vehicle and I expect no issues till many years to come.