Two problems related to engine shut off without warning have been reported for the 2006 Toyota Highlander Hybrid. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Toyota Highlander Hybrid based on all problems reported for the 2006 Highlander Hybrid.
Engine shutdown at 70mph, engine/hybrid system did not respond to accelerator pedal or cruise control - no warning lights. Was able to coast to side of freeway safely. I turned off ignition and restarted the car, vehicle ran flawlessly afterwards.
I made a right hand turn and was accelerating, heard a pop and the car shut down. I coasted to the side of the road and the car wouldn't start. The check hybrid system light came on and then the check vsc light came on. The car was towed to the dealership. Dealership said the hybrid inverter failed.