Sven Baertschi scored for the Canucks to tie it 3-3 with 2:54 left in the third period.
The Canucks and Kings will play two preseason games as part of the 2017 NHL China Games presented by O.R.G. Packaging. They are Sept. 21 at Mercedes-Benz Arena in Shanghai and Sept. 23 at Wukesong Arena in Beijing. They are the first NHL games to be played in China.
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Fantenberg scored 1:25 into the third period to give the Kings a 3-2 lead. The 25-year-old undrafted defenseman, playing his first NHL game, scored on a shot from the point, assisted by Dustin Brown.
"I hadn't seen the Fantenberg kid play before, and I thought he had a good account of himself, and for not knowing him, we put him on the right side and he hasn't played a ton of right side," Kings coach John Stephens said. "I thought he came in and gave us a pretty good performance."
Markus Granlund gave Vancouver a 1-0 lead with a power-play goal 8:25 into the first period. Jake Virtanen made it 2-0 12:08 into the second period.
Jake Muzzin got the Kings within 2-1 with a goal at 15:09 of the second, and Brown tied the game 2-2 with 57 seconds left in the period on a power play.