Tesla has issued a voluntary recall on its Semi trucks as the electronic parking brake valve module found to contain a defect, according to recall filings posted on the website of the National Highway Traffic Safety Administration.

As many as, 35 Semi trucks were affected. The trucks were built with an electronic parking brake valve module found to contain a defect by supplier Bendix in February 2023.

The defect left drivers vulnerable to “rollaway” incidents and increased the likelihood of a crash. According to a recall notice, the defective modules may “fail to move into the park position when the parking brake is activated” leaving drivers unaware their Semi could roll away. The parking brake component defect has not resulted in a crash or any damages, according to the filings.

While Tesla showed off the design of the Semi in late 2017, it only began producing the trucks in Nevada last year and began deliveries to early customer Pepsi at a marketing event late last year.

Tesla said it will “replace the parking brake valve module with a revised part with improved internals that prevent air leakage and allow the driver to engage and disengage parking brakes.”

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Tesla issues recall on Semi over defective brake module, rollaway risk