In addition to these recalls, the NHTSA has reopened an investigation into Tesla regarding alleged unintended acceleration. The investigation covers approximately 1.8 million Tesla electric vehicles sold in the United States, including the Model S, Model X, Model 3, and Model Y. The investigation stems from a petition filed by Roland Belt of Plymouth, Minnesota, raising concerns about a potential design flaw in the inverter system, leading to intermittent higher electrical currents flowing through the vehicles' 12-volt electrical system. This alleged flaw could potentially cause unintended acceleration incidents reported by Tesla owners.