P261C and P261C* is it inverter or engine water pump?

Last week car started overheating after 300 miles, managed to limp back home, 50mph. Thought this was thermostat. Ordered it, today car broke down. Loud swish sound, check engine followed by yellow triangle of death, "check hybrid system". Towed car home, tried resetting the error but it would come back shortly after, when engine idled for 5-10min. Which pump is at fault? Thanks guys!!!

 

Just to make sure it is pump, are there relays fuses to double check? Thanks again!

 

that is possible. when the car overheated there was 4-5quarts missing at that time (put them back right away, but air might have gone in, no question). how to flush it ?
would that ruin the pump, or would the ECU throw those errors as result?
is there any point at looking for the fuse/relay ?
thanks!!!

 

Bisco, do You think this (air in the cooling system/engine loop) would trigger this error code (P261C/C*) or the pump is fried at this point ?

 

interesting, I have noticed that since I came back from that trip, the overflow tank level was dropping, almost as if it was sucked in, rather quickly. I was putting ~1.2qt twice - I could only see fluid at the very bottom connection of the overflow tank. I belive it is low now too - so maybe a lot of dead air space....
that nuztandbolts video is excellent.

 

no leaking at all, no dripping etc. So i started that flushing sequence - filled it a little over, some bubbles were coming out of reservoir, not sure if it was from lower or upper return hose. fluid level was going up and down with occasional bubling, and a lot of water was pushed out. then the engine got operating temperature (fans turned on) and then I got my old "check hybrid system" and car turned the combustion engine off.

 

I think it does, there was not much movement of liquid, just kind of boiling and pushing liquid out - I am almost sure that radiator was cold. I wonder if I should replace thermostat while at the pump (tstat was my initial guess, since radiator was not hot, before triangle of death and reading the ODB codes) ?

still waiting for the pump...

 

great point, this was my thought too. will update once replaced.
great video on that intake manifold! this will help a lot with access, at least from the upper side. bottom bolts I guess can be reached from under, unless I can get some extensions.
what was the bolt size ?
thanks!

 

I wonder, those plastic clips, that hold the pump on the engine - they will pop out with gentle prying ? they seem to be just holding the pump while we start putting the bolts back.
thank You for pdfs!