Telsa Motors confirmed this weekend that it has increased warranty coverage on its Model S sedan, a week after a U.S. consumer magazine highlighted issues with the $70,000 plus vehicle.

Tesla said the drive unit warranty on the Model S has been increased to match that of the battery pack. This brings its coverage to eight years and "infinite" miles, the automaker confirmed in a blog.

The warranty extension will apply to all Model S vehicles produced since 2012.

It is expected to have a "moderately negative" effect on its earnings in the short term.

Consumer Reports released a report last week criticizing the electric vehicle for having "more than its share of problems," including a number of different electrical problems.

In 2013, the magazine gave the Model S top marks for its "smoothness, effortless glide and clever, elegant simplicity."

Consumer Reports purchased the car in January 2013 for $89,650.

Tesla repaired issues found on the Model S that was purchased by the magazine under warranty.

Company CEO said in a blog post on Aug. 15 that "in hindsight, this should have been our policy from the beginning of the Model S program."

If the automaker believes that electric motors are more reliable than gasoline options used in most vehicles, he said "then our warranty policy should reflect that."

Most current conventional gasoline-powered vehicles have a standard three-year/36,000-mile warranty, according to Reuters.

Japanese automaker Mitsubishi Motors Corp and Korean automaker Hyundai Motor Co, its affiliate Kia Motors Corp all offer U.S. buyers some of the longest new-vehicle warranties. Warranties include powertrain coverage for 10 years or 100,000 miles and standard vehicle coverage for five years or 60,000 miles.

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