Other articles on this topic I’ve read mention EMI being a problem, and so I suspect it’s more than $2. For example, from the Verge in March:
> Ford was joined by BMW, Mazda, Polestar, Rivian, Tesla, Volkswagen, and Volvo in staking out the position that AM radio is incompatible with EVs, citing electromagnetic interference from the powertrain. Indeed, Tesla made this same argument when it removed AM radio from its vehicles back in 2018.
> According to a Vice article from 2016, the problem is when the interference gets picked up by the radio:
>> EVs are powered by a rechargeable battery, electric motor, and a frequency converter that controls how much power the car’s electrical motors put out by turning voltage on and off thousands of times a second, basically chopping up energy. This process causes electromagnetic interference that gets picked up by the radio.
I’m in favor of AM radios in cars