If that's an actual, founded concern, in your threat model then you should not get in any vehicle with an ecm, nor have a consumer cell phone. I suppose if you

If that's an actual, founded concern, in your threat model then you should not get in any vehicle with an ecm, nor have a consumer cell phone. I suppose if you strip out the wireless com module may negate most issues, however your vehicle would still be susceptible to various other attack vectors that you won't have in purely mechanical vehicles.