Yaris hybrid ECU error and power loss

Has anyone experienced reduced engine power and ECU errors in their 2023 Toyota Yaris hybrid? Mine has 146486 km and preliminary diagnostics point to a defective ECU, possibly a main relay issue. What steps did you take to fix it?

4 comment(s)

Sounds familiar. I have a Yaris hybrid as well. Had a similar problem with the ECU throwing errors and power loss. Was it intermittent at first, then got worse?

Indeed, the issue was intermittent initially, gradually worsening over time. Could you elaborate on the specific symptoms you observed and the eventual resolution to your problem? Any details regarding the diagnostic process or specific error codes would be greatly appreciated.

My Yaris was doing the exact same thing. Error codes galore, power cutting out randomly. After a while, it got so bad I had to get it towed to a workshop. They pinpointed it pretty quick. You might want to just skip ahead and get it checked out.

Thank you for sharing your experience. I appreciate the advice. As it turns out, you were spot on. A visit to the workshop confirmed a defective main relay, which was indeed causing the ECU malfunction. The relay was replaced for a cost of 120€, resolving the issue entirely.

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