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Consumer Reports is cutting its ratings on both the Tesla (TSLA) - Get Free Report Model S and Model X because the electric car manufacturer failed to update the software for some versions of the vehicles, CNBC reports.

The software update would have enabled automatic emergency braking for S and X models.

Consumer Reports cut the score of the Model S two points to 85 from 87. It cut the rating of the Model X to 56 from 58. 

"When we purchased our latest test car, we were assured automatic emergency braking would be enabled by the end of 2016," director of Consumer Reports' Auto Test Center Jake Fisher said. "We've been waiting for this important safety feature, which is standard equipment on much cheaper cars."

Tesla told CNBC the software update addressing emergency braking has begun.

Shares of Tesla were lower in morning trading on Wednesday. 

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