For nearly 100 years, drivers have been listening to AM radio, an American institution crackling with news, traffic, weather, sports and an eclectic variety of other programs.

But that dashboard staple could be going the way of manual-crank windows and car ashtrays as electric vehicles begin to grab more of the American marketplace.

An increasing number of electric models have dropped AM radio in what broadcasters call a worrisome shift that could spell trouble for the stations and deprive drivers of a crucial source of news in emergencies.

Carmakers say that electric vehicles generate more electromagnetic interference than gas-powered cars, which can disrupt the reception of AM signals and cause static, noise and a high-frequency hum. (FM signals are more resistant to such interference.)

“Rather than frustrate customers with inferior reception and noise, the decision was made to leave it off vehicles that feature eDrive technology,” BMW said in a statement, referring to the system that powers its electric vehicles.

Tesla, Audi, Porsche and Volvo have also removed AM radio from their electric vehicles, as […]