ABS, Traction Control and Brake Lights turned on

I've got a 2010 Prius, with about 174K miles. I was driving this morning, when the ABS, traction control and brake lights all turned on - was driving approx. 40mph on a flat residential road.




According to this thread, it may be a bad ABS sensor. According to this thread, may be a bad 12V battery (my 12V was replaced in 2014).

I do not know how to work on my own car (but I do have access to an inexpensive wifi OBD-2 reader), but I do have an independent mechanic I trust. Before I have it looked at (and before I spend the money on repairs), anyone have any thoughts of what might be going on? I was planning on replacing the car in the next 6-12 months, so don't want to spend a ton on repairs.

Forgot to mention - not sure if it was all in my head, but the brakes felt softer than normal, like I had to press harder on the brakes.

 

Unfortunately, the OBD-II reader didn't provide any error codes. Attached is what I see from the application. I drove around the block and did notice that the regenerative braking did not seem to be working.

I'm not confident about fooling around with the car, so I'll just take it to the mechanic, and pray it's not something major.

 

As far as I know, no, the EGR system has never been cleaned. In fact, I don't even know what that is

 

Just received a call from my mechanic, and was told their tech determined it was the ABS accumulator (I forgot to ask him about the actual error code). He said his tech "relearned" it, and drove the car around, and everything seems fine. At this time, he does not recommend replacing the accumulator itself, as it can get quite pricey.

They're also changing the oil on the car at the moment, so, when they call me back to pick up the car, I will ask for the error code itself so I can determine whether my car qualifies for the ZJB.

FYI, I have no record of ever receiving any notification of Customer Support Program ZJB, and I'm pretty meticulous about maintaining my records. Since I'm past both the Primary and Secondary coverages, I am on the phone with Toyota to see if they will still somehow honor the customer support program, but I am not hopeful.

Update: my case was escalated, but Toyota refuses to make an exception. According to the supervisor, their records indicate notice was mailed to me September 17, 2018. In any event, I would not have qualified anyway since I did not start experiencing the issue until I was already past the Primary and Secondary coverages, i.e., I did not experience the issue prior to November 27, 2019 (regardless of mileage), and, while I am 2 days away from 10 years of ownership, I did not experience the issue before my vehicle hit 150K miles.

 

I did check the Toyota Owners Site and there were no recalls or campaigns.

im at the mechanic’s now, and was told it was error C1391. Was told they drove it around, ensured there was no noticeable vacuum leaks, and everything seems ok (for now). Plan was to get a new car by year-end, but my plans may be accelerated.

 

Thank you all for the tips. I do remember the mechanic doing some of the stuff you mentioned (I recall him talking about cleaning the battery fan, and replacing the coolant and fluid), though not the EGR cleaning. I feel like I've been pretty good about the maintenance on my car, as I have religiously had it serviced every 5K miles. It's been a great car for the past 10 years.

When the day comes to part with it, and that day is coming soon, I'll definitely miss how reliable this car has been, especially in comparison to the German vehicle it replaced.