While driving in hybrid mode while both the gasoline and electric motor are running or shifting back and forth, occasionally the electric motor will come on with a sharp, sometimes loud, metallic -??bang-??. The sound and feel appears to be coming from the rear. The last two times it happened, the car lunged forward on its own without additional pressure on the accelerator, and once over the past week it lunged forward near an intersection when lifting off the accelerator pedal and engaging the brake. The lunge almost caused me to rear end the car in front of me which I was not very close to. This occurs about once every 50 miles travelled or once per day and at various speeds. To date it has not generated a CEL or any other type of warning.

- Long Beach, CA, USA

On 2018-09-17, the vehicle, a 2017 Volvo XC90 T8 hybrid, reported an error stating "reduced performance" within the instrument gauge. The vehicle continued to drive, without the hybrid system, only working on the gas engine. The vehicle was driven approximately 3 miles after the error message appeared. The next day, 2018-09-18, the vehicle was started, with the same error. After driving less than a quarter of a mile, the vehicle abruptly halted in the middle of an intersection, and then limited the vehicle speed to 17 miles per hour. The vehicle was returned to it's origin, unable to exceed the 17 mph restriction, and a tow truck was called in. The vehicle was at the nearest Volvo dealer for repairs for 20 days undergoing repairs. As of 2018-10-15, the vehicle has begin to exhibit a similar problem as was originally reported with 2 months of vehicle purchase in September, 2017, and what led to a multi-day repair in early September, 2018, prior to this incident occurring in mid September, 2018.

- Ventura, CA, USA