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You were both right, it must be the inverter coolant pump. I turned the car on, checked the coolant for turbulence and it was completely still....
Thank you for your help SFO, and for the links. I'll go back to Autozone and ask for the hybrid-compatible scanner and get the subcodes (if any)....
I have been reading this forum for years and learned a lot. Thank you. Now I have a problem of my own. I have a 2009 Prius with 150k miles on...