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GM, which markets vehicles with OnStar system previously installed, and OnStar are "actively working to resolve this issue," Kamkar wrote in the video's description.
Kamkar said he will release further details about the device and how it works at the upcoming Defcon security conference.
A video released on YouTube earlier this month featured hackers Charlie Miller and Chris Valasek taking control of reporter Andy Greenberg's Jeep remotely using a security flaw in the vehicle's Uconnect Internet-enabled software. The video led Jeep to recall about 1.4 million vehicles.