We have a 2011 Prius that sometimes does not start up right away. When we press the brake and power on the car, the lights will come up, but the READY symbol on the dash does not show up. We have to turn on and off the car maybe 4 or 5 times before the car actually starts up.

After this happens, the car usually runs fine for a whole week or month. Then right back to doing it again. This has been going on for about 6 months. And i'm ready to address it.

When the car doesn't start up, a whole bunch of car symbols show up, but I've never taken note of which are showing up, because it seems like the same symbols that show up right before the car boots up normally, but because the car doesn't fully start right away, those symbols stay on.

Any ideas what the issue is?

Update: Some have suggested I get the battery tested.

The battery reads 12.30 volts when the car is completely off.

It dips down to 11.85 volts when the car is first turned on.

And it jumps to 14.47 volts when the engine kicks in.

These are the symbols when the car won't turn on.

enter image description here

  • also want to mention that I've noticed the time being off by 30 minutes once. (no) it wasn't after day lights savings. heh – Outdated Computer Tech Dec 26 '19 at 20:30
  • One thing with electronic systems in general is that after a few years it can be worth disturbing every connector (when the equipment is switched off) because of a build-up of oxides at the metal/metal boundaries. This effectively "wipes" the contacts and provides a good connection. – Weather Vane Dec 26 '19 at 20:55
  • The car is around 10 years, old i'm leaning toward it being the battery. I've never changed the 12V battery yet. – Outdated Computer Tech Dec 26 '19 at 22:44
  • So, get the battery tested. – Weather Vane Dec 26 '19 at 23:03
  • @weathervane I tested the battery myself and updated the question. – Outdated Computer Tech Jan 15 at 0:03

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