Tesla has repeatedly defended its autopilot feature, saying it leads to fewer crashes than traditional driving. The company also says it informs users about just what the technology does.
Rosner said that the term "autopilot" in Tesla's marketing can be misleading although the Model X is "all about helping the driver."
"I think there's sort of confusion among the buyers of the cars and I think that creates a real problem. The negative side of it is that casts a bad light on autonomous driving," Rosner said. "We really don't view it as a problem with autonomous driving or the direction of the industry. We really view it as an execution problem with Tesla."
He called Tesla's marketing aggressive, but said that it has been powerful for the brand's image.
"I think it does a tremendous amount for their image," Rosner said. "It's something that has been very, very powerful for them, but clearly it's misleading and something's probably got to change."