Of course , its normal to be concerned about Electrical issues
Other known issues with the Highlander Hybrid involve the vehicle's electrical system. Though integrated with the electric drive system, these problems tend to occur in non-driving components. On early Highlander Hybrid models, power inverters have been known to fail, stopping the vehicle from being driven and requiring a costly repair. Some owners have also experienced problems with error codes and warning messages displayed on the dashboard. These messages may indicate problems with the vehicle systems that are working properly, or may remain on even after repairs are made
Oh , what a feeling !