Accidentally left one of the reading (dome) lights on overnight. Now car won’t switch into EV mode

So recently I had put in a new 12v battery because the one in the car reached the end of it’s life. Two weeks ago is when that happened.

Everything was OK until this morning. One of the reading lights out of four was accidentally bumped and left on overnight. The car had enough power to boot up the system and run the A/C and all that.

However, the car would not switch into EV mode with a warning that the battery was low. The bar graph meter shows the EV battery (I call it a traction battery) had almost all bars full. The car moves without the ICE being engaged so I know the motor is getting juice enough to move the car.

The amount of miles that shows up below the battery bar graph isn’t displaying. Could it be a computer glitch? Do I need to put the new 12v battery on a charge because of my mistake with the light? The light stays on even when the car is OFF, and I’m not sure if it times out or just stays on.

Or do I have larger problems afoot with the EV system, traction battery or computer? It’s only got 132,000 miles on it. For some cars that might be a lot, but I understand Prius’s to be fairly well made.

Any advice you can give will be appreciated. I know enough NOT to go messing around the high voltage system that has between 360 and 390vdc and enough amps to be fatal if you mess up.

 

My next step after topping off the 12v battery is to charge the traction EV system for a while, too.