Tesla shares are about to take a turn for the worse: Piper Jaffray

Tesla shares have taken a wrong turn.

The stock has tumbled more than 17 percent this year with losses accelerating last week following a mediocre reception to its Model Y unveiling. It is now 29 percent off its record high set in September 2017.

One technical analyst says the stock charts point to more hardship ahead for the electric vehicle maker.

"You've been stuck in a trading range for about 2½ years – $245 on the lower end, $390 on the upper end. Back in December, you lost power at $390. You've been backing and filling since," Craig Johnson, chief market technician at Piper Jaffray, said Friday on CNBC's "Trading Nation."

"To me, it looks like we're going to come back down and retest the lower end of this price channel, confirm it before you can do any sort of tactical trading opportunity with these shares," said Johnson. "I'm waiting for it to pull back and retest that level."

A drop to $240 would mark a decline of about 13 percent from current levels of $276. The stock has not traded below that price since the beginning of 2017.

Fundamental issues hang over Tesla, too, says Michael Bapis, managing director at Vios Advisors at Rockefeller Capital Management.

"I can't get comfortable owning it right now," Bapis said Friday on the show. "They're really struggling with brand definition. They don't really know who they are. They don't know what's the difference between them, Ford, GM, and they're struggling with production and delivery issues. The competition is heating up."

Volkswagen has ramped up its push into the electric-vehicle space with $9 billion bookmarked for development at its Audi arm. "Tesla killer" Nio is also making strides in the Chinese market.

Tesla also trades at an extreme premium compared with its peers, says Bapis.

"They're trading at per units sold to market cap of $120,000. Daimler and BMW trade at $30,000. So it's four times any other market cap per units sold out there," he said.

Tesla is the second-worst performer on the Nasdaq 100 this year. It is down 19 percent this year.

Correction: An earlier version of this article incorrectly reported its 12-month performance.

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Michael Santoli

Michael Santoli joined CNBC in October 2015 as a Senior Markets Commentator, based at the network's Global Headquarters in Englewood Cliffs, N.J.  Santoli brings his extensive markets expertise to CNBC's Business Day programming, with a regular appearance on CNBC's Closing Bell (M-F, 3PM-5PM ET). In addition, he contributes to CNBC and CNBC PRO, writing regular articles and creating original digital videos.

Previously, Santoli was a Senior Columnist at Yahoo Finance, where he wrote analysis and commentary on the stock market, corporate news and the economy. He also appeared on Yahoo Finance video programs, where he offered insights on the most important business stories of the day, and was a regular contributor to CNBC and other networks.

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