Check hybrid system light came on

In January I had to replace the traction battery in my 2010. Warranty was only 8year/100K & it had ~140K on the clock.
I had been monitoring the traction battery with Torque & I knew it was failing. I found a used battery from a low mileage 2012 that I installed (after a few charge/discharge cycles using custom equipment to get the battery back in top condition). I've got ~4K on the replacement battery & everything is working great.
Replaced Traction Battery - 2010 Prius | PriusChat
Your failed battery is only the second that I know of here on Priuschat (on a G3).
It sounds like your service department did a great job. You were fortunate the battery failed while still under warranty. Its like you just got a "new" Prius! Enjoy

 

I'm having the same exact problem with my 2010 Prius. Suddenly all the lights came on plus "Check hybrid system" today. It drives a little bit sluggishly. Unfortunately I just passed the 8-year warranty period a few months ago but have less than 100,000 miles. Toyota dealership will do a diagnostic test in a couple of days. When I called Toyota headquarters today they opened up a case number and asked me to call them back with the results. If it does need a new battery I don't expect them to come through. Anything else this could be besides the battery? The Toyota dealership acted like it could be dozens of things.

 

The car has trouble codes that can be read by the dealer software and some other scanners. Other trouble scanners only read the basic codes, not the hybrid specific ones.
The lights are just to alert you that there are active trouble codes. The codes (and freeze frame data, if any) dictate the troubleshooting path.

 

It can be different things.

For ~$75 you can buy your own tools to read and scan codes as well as see live data like battery voltage.
- Android phone/tablet
- Elm 327 Bluetooth OBDII reader
- Torque Pro app

I feel like all owners of older Prius should automatically be issued these things once the cars reach a certain age. Would really help when trying to diagnose inevitable problems that arise.

 

I should put this in a saved text message to copy and paste:

Your car is about 8 years old.
That is usually the absolute outside range of how long the 12 V battery lasts.

On ANY modern vehicle that is computer controlled, you MUST first ensure that the power supply for the computers is good before chasing any other problems. That is the 12 V, so called Aux., battery.

 

Perhaps because this is true? The "CHECK HBYRID SYSTEM" warning will come on for everything under the sun. In your shoes, I would get the dealership to check the codes, go from there. Be sure to get the codes from them, post here.

 

I have 2010 Prius. Check Hybrid system light came on for the 1st time last July, scared the heck out of me as I had no idea what that meant. My mechanic and then the Toyota dealer both said I need a new battery, about $4000 dollars. I already had 195k miles so I wasn’t sure I would want to spend that kinda money. I got a OBD2 scanner from amazon and turned off the warning light and decide to just drive until the battery completely died and then I would just junk it. Well, I’m at 208k miles now and the car is still driving very well. My mpg has gone down to 48mpg from 53 ish, however.

 

You NEED to have the 12 V battery tested.
If it is bad, replacing it might buy you a little more time.

 

what happen to sam spade (1)?

 

!I do not know. I ignore them both.

 

They both ended up in the same place for me.

 

we need a detective to investigate.

 

Hmmm
Great think alike but fools seldom differ. Which are we?

 

I’ll get right on it.

 

If Bisco is such a fan maybe he needs to be put in the same place we put the Sams..

 

Depends who you ask.

I know which one my wife he would say.

 

Meh, his wit is very seldom condescending, particular to newbies.

He also said welcome a lot and distributes likes .