Little help- Red triangle and hybrid system light after 3 way flow valve change

as my probably too long title alludes to, I have successfully changed the 3 way CHRS (I think) valve, and now the car is very upset.

I was unsuccessful in clamping off the lines, and thus lost a decent amount of coolant, during the bleeding phase, the over heating light popped up a few times, but has not been back. The car is throwing heat, but now as soon as I turn it on, I'm greeted with "Problem" accompanied by an exclamation point over a car symbol in the multi-function display as well as a red triangle of doom. I've also gotten the tsc light and the brake light at different times, which is interesting.

Troubleshooting I've tried includes disconnecting the negative battery terminal (temporarily fixed the lights, but they came back after a short test drive) as well as adding more coolant. It's possible I added too much coolant, but surely this would just be expelled via the recovery tank?

I do need to replace the 12v battery, someone did it before me, and they used a shit battery, voltage isn't great in acc mode, and I know it needs to be changed. However I was under the impression that the warning light I'm seeing has more to do with the hybrid system, which should not have been touched.

 

so, small update. the brake warning light and tcs light are still on, and so is the triangle and the (I assume) hybrid light.

The traction battery seems to be working fine, it discharged and recharged as it should, my fuel economy doesn't seem to have been impacted, but I can't use cruise control, and I drive long distances.

 

Yeah, I refilled it and topped it off, both at the rad and the overflow. Pulled the battery that's in there, and inspected all around, there's that familiar leak which I also sealed today. The battery they replaced the stock with is a carquest agm, and when I check it in ign on, it's low 11.2 or so volts. It does go up to 13.8-.6 or so when the car is running. It's thrown the VSC, Brake and ABS codes before, but usually only when traveling on the highway or when I accelerate to pass someone aggressively. Otherwise it doesn't throw those lights. Only now that I've replaced that valve. I had assumed that those were being thrown because of the battery. Something of note, I noticed when replacing that the hose on top didn't have the white dot, rather the middle hose did. I don't know if that means someone replaced that valve before me, and put the hoses on incorrectly or not, but I replaced it the way it was pre-removal just in case I have a fluke car that they put the dot on the wrong hose. Is there a chance it was wrong the whole time, and that now that there's a good valve in there that is the cause of the issue?

 

yeah. I'm working on it. not a lot open on a sunday in rural america. also, of note, the abs light isn't lit currently, which is odd, since it usually *is* all three of those lights.

I'm guessing and troubleshooting all this simple and stupid stuff because it went from having no faults, to all of these after only being put into diagnostic/idle mode. It's odd, and its surely something dumb.

 

So, had the codes read and cleared, he didn't give me the readout I asked for, so I can't remember all of them, though I remember something about there being something between the brake pad and rotor, airbags, but nothing about the traction battery. They stayed off for around 15-20 miles and then came back on. I've installed a new 12v battery and that seems to intermittently fix it? The (!) light, and tsc light come back on, and then the car with the exclamation point in the MFD. Wednesday I'll get them scanned again and have them give me a darn readout, so if they come back I can at least have some idea where to start. He said there were around 15 items.