ABS

You've got a code there about the pump motor not running, two about the pressure being off (perhaps because the pump motor isn't running), and one about a relay that's responsible for making the pump motor run.

I would kind of want somebody with a multimeter to follow up that last angle before replacing an expensive and difficult part. I would feel sheepish after that much effort and expense if it still didn't work, and then turned out to be a relay or wiring.

Do you hear the brake pump running from time to time?

 

If the pump is not running, and it were my car, I would first make sure the problem is not the relay, and not the wiring from the relay to the pump, and not the wiring from the power source to the relay, and not the wiring from the pump to ground. If I had ruled out all of those possibilities, then I would spend the money and effort on the pump.

If you are confident that all of those possibilities have been correctly ruled out, then the pump would be what's left. If you are not confident the other possibilities have all been correctly ruled out, then they would be worth checking.

You could look up the detection condition for C1253 to see why the ECU might have flagged the relay with the relay being good.

 

Far too often, mechanics ( technicians) tend to use a code scanner as an absolute, well not bothering to properly diagnose the underlying problem. Time is money and diagnosis can be time consuming. So, they start throwing parts at the problem.
My first train of thought would be to test the circuit by checking the the powers and grounds at the relay. Just because the relay clicks or you can hear it, doesn’t mean the relay is good. The important thing is to determine if the LOAD side of the relay is completing the circuit to the motor. If you can determine that the load is being supplied to the motor and the motor does not run, then you can verify that there is a bad motor or an open in the circuit somewhere beyond the relay.

 

Check with Toyota, you may be eligible for brake booster pump replacement

 

It would still be too bad if they changed the pump and it wasn't the problem. Sure, you'd have a new pump out of the deal, but also delay and frustration.

 

Oh that would be the part where toyota would diagnose

most of the codes OP mentioned were mentioned in old brake booster ZJB program

C1391, C1252, C1256 or C1253

 

Sure, but that doesn't change what the codes mean, or the need to diagnose what is causing them.

Oddly enough, a code about a relay or power supply to a pump can at times turn out to be there because of a relay or power supply problem. Even if it was listed in a service campaign as possibly appearing in connection with a bad actuator (ZJB was about an actuator internal leak), just blindly replacing an actuator in that case would result in an unsolved problem.

Sure, the dealer at that point would probably just hold on to the car and begin the actual diagnosis that should have happened first, and eventually return the car to you when they have found the real problem and fixed it. As long as there's another car or a loaner to use while that's happening, it's fine.

If the cause turned out not to be the actual internal leak addressed in the ZJB program, the work might not all be cost-free.

 

Before you do anything first have them check the connection at the abs pump first. Its a 2 plug connector. What happened to mine was the abs pump rattled loose causing the lights on the dash to come on. I bought the brake pedal actuator for my 2014 prius c

 

What fixed it?

 

There was a Customer Support Program issued in 2019 for 2011-2015 Prius with any of these codes C1391, C1252, C1256, C1253. They put out a bulletin that all the ABS system parts had to be replaced and they covered the repair. Unfortunately for me the same thing happened on my 2013 with 84,000 mile last week and the program ended 6 months ago. Your mechanic should have had the bulletin and you should have gotten it done for free. I don't know if you can file a claim now. There was a file with the NHTSA to investigate and hopefully issue a recall but the petitioner withdrew it. I have filed a complaint and hope other owners will too. It was a dangerous situation as I lost control of my brakes while driving.

 

The customer support program was a real thing, and the issue it covered could cause codes from that set.

But there are also other issues that can cause codes from that set. So there is a bit of diagnosis that needs to happen, starting with just knowing what codes are present, to be sure of why they are present.

If the why turns out to be the issue addressed in the CSP, then that repair would fix the problem. If the why turns out to be something else, then the CSP repair wouldn't necessarily fix the problem, and fixing the actual problem would.

Posts #4, #6, #8, #10 above kind of expanded on that.

It's no fun that the CSP repair isn't covered for free anymore. But that's all the more reason to make sure the diagnosis gets done, because if the problem in your case turns out to be something simpler and less expensive than the CSP repair, then it's to your advantage to know that.