washington four republican members congress monday urge u.s. auto safety regulators convene industry-wide effort prevent possible attack computer systems vehicles lawmakers address concern letter u.s. national highway traffic safety administration report case vehicle hack researchers show could take remote control vehicle function car horn brake power steer letter cite work publish august wire magazine two researchers able force fiat chrysler automobile nv 2014 jeep suv perform erratic unsafe manner access on-board diagnostics obd port automakers require install port vehicles since 1994 test emissions compliance letter representative fred upton michigan republican chair house energy commerce committee three others say port currently exist create grow risk safety security passengers fiat chrysler say august demonstration publish wire require computer physically connect vehicle port company emphasize owners connect unknown untrusted devices obd port nhtsa immediately comment letter safety agency say plan release cybersecurity guidelines auto industry come weeks u.s. government take issue seriously friday u.s. justice department say form threat analysis team study potential national security challenge pose self-driving cars medical devices internet-connected tool federal bureau investigation nhtsa issue bulletin march warn motor vehicles increasingly vulnerable hack four u.s. lawmakers urge safety agency address vehicle hack