HELP! ABS ECU Issue + all the lights (with codes)

I drive a 2005 Prius. Car is old but new to me. Purchased from a friend who was the only owner, no accidents and had 45,000 miles on it. Lived in a garage most of its life. Hybrid battery replaced in 2017/18.

A month ago had the red triangle warning light come on. My mechanic read code
UO129- lost communication to brake module. I got the light to clear by fussing with some wires under the hood. Was fine for a month. Just under two weeks ago I was entering the highway when I heard a loud buzzing and saw multiple lights- yellow brake, yellow abs and vsc. Brakes felt funny under foot, like a cloud was under them. Brake did not work properly. Had the car towed to a Toyota dealership. They read 3 codes but don't tell me what they are. They tell me I need to replace the 12v battery (this didn't seem shocking as my friend had the car sitting for months at a time so I knew it would need to be replaced eventually). I pickup the car Tuesday morning. Tuesday at 4pm the exact same thing happens. This time i turn the car off and then on. Lights and sound stop so I drive it to the same dealership 5 minutes away. This time they tell me they got code c1300- abs ecu malfunction- internal failure of the absd ecu. Recommendation is to replace the ABS actuator. This is a very costly fix. Combined, these two adjustments are almost exactly what i paid to buy the car.

I pickup the car today at closing time. Drive to the grocery store and grab dinner. As I am heading home (maybe 50 minutes after pickup), completely unprovoked with my foot on the gas the same thing happens (photos attached of lights and symbols that turned on. Also present was the buzzing sound and the word PROBLEM across the screen). The difference now is the warning light and little car symbol on the screen will not turn off. I drive home but have to stop 3 times in 20 minutes because it keeps happening.

The car is now at my home and the dealership opens at 7am tomorrow but I am truly at a loss of what to do here and now I wonder if they even have a hybrid mechanic there or if they are just guessing at this point. I would appreciate any insight you all have. Thanks J

 

Should re-phrase. Was more like making sure all the caps were closed and nothing out of place. This seemed to turn the light off.

 

Than

Thanks for this. I did just call a hybrid mechanic. He said I would need to take it back to Toyota as it sounds like a reprogramming issues and only dealerships can do it. He also said it could be that both computers are bad, not just the ABS ECU one.

 

I have paid the dealership to replace the 12 volt battery (which they said would fix it). When that didn't fix it, I paid for the ABS ECU computer to be replaced. That also didn't work. The dealership called this morning to let me know that the car is still showing code c1300 and the mechanic does not know why (isn't that fun!?). She said he was "taking the car apart" to figure it out. Sounds like a total shit show over there. I spoke with the manager of the service dept yesterday and she didn't say anything except I could have a loaner car for the weekend since my car would be there. Not sure what the next move is here. Call Corporate?

 

I am waiting to hear from them tomorrow. They have done nothing in regards to reinstating parts, but I have told them I will not pay them for any more repairs moving forward.