On a small number of vehicles, a software problem could cause the pedestrian warning sounds not to work when the vehicle slows from 30 to 25 km/h. As a result, the vehicle may not produce enough sound to be detected by a pedestrian or cyclist. Electric vehicles are required to make a minimum sound level when operating at low speeds.
Pedestrian warning sounds that don't work could create an increased risk of injury for pedestrians and cyclists.
General Motors will notify owners by mail and advise you to take your vehicle to a dealership to reprogram the body control module.