I hope I messed something simple up..

Any chance your 12v battery is low?

Get a voltmeter and report back with the reading with car off.

P1121 is for coolant valve. (Nothing to do wirh throttle position) this should not have been affected by brake actuator. It is a common failure for older Prius, though. You can read up about it on PriusChat.

Also from tech stream can you take a pic of the screen that shows all the battery block voltages?

 

Old 12 volt got hammered as you left the doors open and killed it and maybe the orange battery safety interlock is not installed correctly.

You push it in....flip up the handle...then slide that handle down till it locks,

But it’s way overdue for a new hybrid battery. If you can pull the inverter you can pull the hybrid battery out.
Pull the hybrid battery out And see how corroded it is in there. Take a lot of pictures of it before disassembly.

 

I agree with @ericbecky. 12V is the first place to look. Could be the safety interlock on the HV battery, but I don't think it would throw all those codes. Low 12V throws random codes.

 

Hometown Hybrids are reputable folks. Honest, knowledgeable.

You can get USED or NEW batteries installed by them.

 

To whittle down the picture a little, several of the codes in your original list are 'reflector' codes posted by one ECU just to say it got notice of something from another ECU.

The P3000 is just a code from the HV ECU telling you it got wind of something from the battery ECU and you should ask for those codes.

The C1259 and C1310 are both codes that just get posted by the brake ECU when it gets word of a code from the HV ECU. So, given you have battery codes, of course you have all these also.

You will always have B1421 about the solar sensor if the car is not in strong light when you pull codes. It's only a problem if you know the sun really was shining on the sensor at the time.

There are a lot of adherents to the idea that low 12 v can result in "random" codes (the suggested mechanism is that the voltage gets so low that the logic circuits, likely 5 v rated, in the ECUs, simply can't function, whereupon they perfectly execute all of the steps of the OBD-II protocols to transmit codes to your scanner, and only the codes themselves are bogus. There are multiple problems with the suggested mechanism. ) To show that this actually happens would need evidence meeting a pretty high bar, and I've never seen any on PriusChat yet that does.

On the other hand, it's perfectly plausible for low 12 v to get you some codes from ECUs telling you (correctly, not randomly) about the low voltage you've got, such as the C2318. (Even that code, a lot of the time, will mean there's a power circuit problem on the way to the park motor ECU, not literally that there's a battery problem ... but in a case where you already know there is a battery problem, you don't need to wonder too hard about this code. )

Perhaps plausibly, a number of those codes could reflect low power availability (not enough oomph to move the coolant valve, or the air servo, or power the TPMS radio receiver).

So in this case, even though I'm not in the "low 12 v causes random codes" camp, for you it would certainly be reasonable to charge or replace the battery given that you know it's very low, and then see which codes, if any, come back.

-Chap

 

Yeah... About those bad blocks.

Block 9 at 14.6v while the rest are at 16v? Bad
Block 7 at 13.1v when the rest are at 16v? Really, really bad.

Something is shorted or has bad wiring.

 

Assuming it's original, you have a very old and tired HV battery and this:

was the straw that broke that camels back.

You can read the link in my signature to see what I did a couple of years ago when the battery in my 06 began failing. It will also help explain some of the options available to you.

GOOD LUCK!

 

I missed that part.
Well, maybe there is hope?
Get a high voltage charger and charge things up.

May be able to try other options forcing battery to charge up while simultaneously clearing codes.

 

A good cleaning of all the connections in the battery and then a grid charge with a Prolong charger may get you back on the road, but no guarantees. If it was my car, with an HV battery that old that's been drained that low, I'd be more inclined to get a new battery if the car is still in good shape otherwise. The brake actuator and the air conditioning are the main expenses aside from the HV battery, so you've already gotten one out of the way.

But I would pay more attention to the advice of @ChapmanF and @ericbecky. They have way more experience in this area than most of us.

BTW, Chap. When I said "random" codes, I was not being very careful with my words. I think "seemingly random" would have been a better way to say it. I know that there are relationships between the events, but if someone hasn't worked them out, they don't make sense.

 

Sorry to have gone on at such length about that ... it's a notion that gets bounced around here by a lot more than just you, and sometimes by people who really double down on the idea that the ECUs are 'confused' and reporting 'random' codes.

'Seemingly random' when one hasn't done the homework to see the relationships, is an apt way of putting it.

-Chap

 

There are a couple people here who sell them. @jeff652 at Replacement Toyota Prius Module – Hybrid Automotive is one. It would be pretty convenient to get the module from the same place as the charger if you choose that route. I'm not sure, bu I think @Texas Hybrid Batteries (Matt) with Texas Prius Battery Replacement might as well. And @ericbecky could be another source. Any of them would be better, imho, than rolling the dice with a stranger on Ebay.

Yeah. For a while I was thinking it random. But I began to realize that there were all these messenger codes and to see somewhat of a pattern in the codes people were reporting. Plus, I imagine that different components have different power and voltage thresholds below which they stop working and I'd expect them to be fairly consistent from car to car.