NEW YORK (TheStreet) –– Tesla Motors (TSLA) - Get Report plunged in after-hours trading as CEO Elon Musk said that China sales have significantly declined.

Speaking at the Automotive World Congress show in Detroit, Musk noted that China was weak in the fourth quarter, but did not provide any detailed figures. Earlier in the day, Musk made comments to Bloomberg regarding China, referring to the country as a "wild card," which changed for reasons not yet understood.

Shares fell nearly 7% in after-hours to $190.09 after ending the Tuesday session higher by 1%.

Coincidentally, investment guru Jeffrey Gundlach, who has given his thoughts on Tesla before, made remarks about Tesla in a conference call, noting that it didn't make sense that people were changing their car purchasing decisions because of a 6 month drop in the price of oil. "I think of all the car companies, Tesla is less of a car company than any other," Gundlach said on the call. "I'm surprised that anyone would change their car buying habits based on the six-month price of oil. Tesla isn't so much a play on cars being sold, but on batteries being transformative in many phases of life."

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