Troubleshooting Prius Hybrid System problems

Alright so here is the timeline, any help would be greatly appreciated.


While driving Triangle and warning telling me to pull over and check Hybrid System comes up. Car would hardly accelerate so pulled over and restarted. Ran fine but check engine light was still on.

Error codes detected:

• P261B Coolant Pump B Control Circuit Range / Performance
• P148F Engine Coolant Pump Over Revolution
• P0A0F Engine Failed To Start
• P3000 Battery Control System

Checked for recalls. Software recall needed and Toyotas website states if inverter has problems they will replace it as well.



Take it to Toyota and they do the software recall. They tell me after checking codes I need my water pump replaced for $1080. I check the paperwork and there is nothing showing that they even checked the inverter. They said my battery tested fine verbally but even that was not listed amongst tests ran in paperwork.



Toyota cleared the codes. Now after software recall the same errors pop up but I lose gas pedal completely and after restart I am still dead in the water. I thought this is what the recall was suppose to fix and not make worse. Luckily I had scanner on me and cleared the codes so I could get off the side of the highway. Ran fine after clearing.



Water pump arrives from AutoZone and install it myself. I manually check the old water pump using a multimeter at the relay and it still runs when plugged in. I go ahead and leave the new one installed.



I check water pump fuse/relay. Fuse is fine and relay tests good.
I check inverter pump fuse/relay and both are fine as well.



I check coolant reservoir and there is no turbulence. I read in Gen 3’s this is normal though.
I check inverter reservoir and see only a small amount of movement.



Does this sound like an inverter problem? Power for both of these comes from 12 volt battery I’m guessing so maybe inverter pump is bad which is causing overheating of the inverter but I’m not sure. I would of thought a code for the inverter pump would have popped up if thats the issue.

 

I replaced it myself. Pretty simple switch so I couldn't justify dropping over $1000 on it.

 

Don't know yet but seeing as how the old one is still working I don't think I solved the problem.

 

The water pump not the inverter pump.