"President Barack Obama hit China automobile tire makers with a trade tariff in 2009 and now Beijing has struck back with a potentially more punitive tariff, as much as a 21% tax hike on U.S. car exports bound for China, the world's largest auto market."
GM and Co having shipped all the component parts manufacture over to China disposing of many US jobs to save money and make more profit for their shareholders are now finding that they can't even sell their products in China! Great idea to give China all of our manufacturing from the west - why do they need any of our products now?
I doubt that the import tax on cars is in response to the tire tax. It is more likely increasing pressure in response to American interference in the South China Sea dispute - and this is because that sea is the main trade route for the region. Normal trade war pawn moving.