Is P1121 coolant valve related to the inverter water flow?

Hello, new owner and member. I recently purchased a high mileage G2 and after roughly 30 miles of use the check engine light came on. Codes are P1121, P1116, and P0420. So I've ended up with a few questions.

First, P0420. It seemed reasonable to leave dealing with this code until after the other two are dealt with and I could verify it was unrelated.

So after watching a few videos and reading about P1121, the first thing I checked the coolant reservoir level. and it was near full. I've checked for open recalls on Toyota's site and there are none. So I'm pretty much convinced it's time to replace the coolant control valve.

I also happened across a few videos relating to the inverter coolant flow and while under the hood I checked the Inverter water reservoir for that wave movement. The inverter water is still.

What I am wondering is could the faulty coolant control valve related to the P1121/P1116 be related to the still water in the inverter coolant reservoir? Or is the coolant control valve part of the engine cooling system as opposed to the inverter coolant system?

 

Thanks for the reply JC,
Would the defective 3 way valve cause the inverter coolant flow to stop?

 

I've put about 130k miles on two separate G1 insight over the last 8 1/2, years but I'm a newby to Prius. So I appreciate the replies on this. The more I look into these codes and the inverter system the more I end up with questions.

Priuschat threads seem to show the P1121 3 way valve issue is unrelated to the P1116 code. Would it be best to address these two codes simultaneously or one at a time, the 3 way valve first?

Second,
I did drive the car for 3-4 minutes before finding there was no inverter coolant movement with the motor on and idling. It seems odd that the inverter's coolant system is not throwing a code or a dash warning light but there is no coolant movement in the overflow can.

Does the inverter cooling system maybe have a thermostat that could be stuck closed?

 

Hi Eric,
I've seen some of your posts over on ICN, very informative. Thanks for the reply.
When I check to feel if the inverter pump is running, do I also need the IC motor to be on and running or just have the ignition fully on?

 

I reached down and felt the inverter coolant pump as suggested, it's dead. Good thing I checked. Thanks for all the input. Once it's all in I'll have the P0420 code reset and see if anything comes back.

 

Carfax shows a water pump replacement at 125k. even so, coolant is due. Oil is clean, Deciding now if I'll do plugs and trans fluid while I'm in there.

probably wont have this one more than 6 months as I'm kinda watching Manhim for a decent '16 to come up in Florida.

Will post more as I go

 

No telling which of the two water pumps was changed out but 125-150k is a pretty good life for any water pump... The carfax detail is sparse. I'm gambling it was the ICE pump that was changed.
probably gonna swap out the plugs too.