2013 Prius in Canada 185,252 kms. Dash lit up and car went into limp mode. Dash message Check Hybrid System. Had it towed to dealership. They diagnosed it needs new inverter/Converter. $4700 Canadian Then after a pause. Hold on. Let me check. It was covered under a TSB (technical service bulletin) Toyota paid to fix it. They have extended the coverage to 15 years unlimited mileage. (At least in Canada) I was so happy I opted to pay to have the inverter cooling pump replaced at the same time. Thought new inverter I better protect it as much as I can
When I had the dash light up. I was able to go into diagnostic screen in car and get code U0129. Vehicle stability control VCS ECU communication. Then I scanned with my Xtool D7 and got the following codes. P0A78 PERFORMANCE OF DRIVE A inverter P0A94. Performance of dc-dc converter P324E intermittent circuit of MG-ECU power relay C1259. Regenerative malfunction of HV control system.
Received car back today. Will need to drive for a bit to see if mileage improves. Used to get 5L/100km. Lately it's been closer to 7.5. I attributed to winter tires and winter gas.
Replacing a working inverter cooling system pump is probably an unnecessary expense. The engine cooling system pump much more often leads to consequences that empty the wallet. Was the intake manifold, EGR system, EGR cooler cleaned? These systems gradually become clogged over long mileages, leading to engine overheating, which requires either a major overhaul or replacement of the internal combustion engine.
