Prius, lights, dashboard aren't getting power? Won't start.

Hello,

I hope someone can lead me in the right direction.

I've had my 2010 prius for just under a year. Everything had been working fine until recently. I got a Key Battery Low message on by dash, and replaced the battery in both fobs and the message went away. Monday night, about 3 weeks after replacing the batteries, I had driven to the store, got out, locked the car, did my shopping, came back went to get into my car, hit the unlock button on the fob, and received no response. No rear/front lights flashing to indicate the car unlocked. Nothing.

Popped out the metal key from the fob, got the door unlocked, got in to find that the car was completely unresponsive. At that time I was forced to leave the car in the store parking lot, get a ride home. I started looking online, and I think it's the Engine Immobilizer that kicked in.

I'm just trying to figure out where I go from here. Went back to the store lot Tuesday morning, tried the fob again, and this time it worked fine. Car started right up, as if nothing happened. I've had the rear battery replaced, but I had the same issue Thursday morning when getting ready to leave for work in the morning.

Any thoughts, Ideas, Suggestions before I see if the dealership has to get in there?

 

I don't offhand know if the battery was an OEM or not. I had my mechanics shop take a look at it and they replaced the AGM battery and charged it. Everything was working fine when I picked it up, made a couple stops around town. Then Again, no start. I can check the battery tonight when I get off work.

 

Sorry I have been late in returning.

The connections too the battery are secure. Literally no oxidation to be found.

I used the key fob to unlock the doors as I came up to the car, turned it On, then off just like normal, but after I was done looking the battery over, I attempted to start it up again and 0 power throughout the car.

 

The car is completely powerless. No headlights, no cabin lights, nothing. I'll likely have to take it in, I don't have much time to throw away on it with my baby coming.

Thank you for all the ideas.

 

It's been a while since I could return to this. I was prepared to take the 12v battery out and have it tested. I decided to try jumping the car and immediately upon connecting the jumper cables my Prius woke up. The center dash is on. The power button is currently lit up, but with a orange/red light. Going to give the battery a full charge, but I may go ahead and get the optima yellowtop you've advised of. I hope all the trouble is something as simple as a battery that wasn't charged when installed...

 

I'm not at all pleased with the service I've gotten and am looking to go elsewhere. They finally admitted as to not having any experience with a Prius shortly after my prior posting and this hasn't been on the top of my priority list until recently.