CNN —

Despite billions in tariff costs for imported autos and parts, new car prices have stayed relatively flat. But the news isn't as good for car owners taking their vehicles to the repair shop.

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The price of car repairs jumped 5% just from July to August, according to the latest Consumer Price Index, the government's key inflation measure. That's the largest one-month increase on record, and the cost of repairs is now up 15% compared to a year ago.

But despite what you might think, it's not just tariffs driving up the price of repairs. That's even though tariffs, which are a US tax on imports, took effect on all imported parts in May .

"There's quite a few factors," said Skyler Chadwick, director of product consulting, Cox Automotive.

The

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