Nearly 4,500 Tesla vehicles in South Korea have reportedly experienced battery system malfunctions that prevent charging, leading to an official demand for resolution from the country's Environment Ministry. The issue, identified as the 'BMS_a079' error, has been documented in 4,637 cases since 2017, according to data submitted by Tesla Korea to a lawmaker. Over half of the faulty batteries were reportedly replaced with reused, rather than new, batteries, escalating consumer complaints. The South Korean government has warned that a failure to address the problem could result in the suspension of government subsidies for Tesla vehicles, which would be a significant blow given that the Model Y was the best-selling electric vehicle in the country in the first half of the year. This news comes a day after the U.S. National Highway Traffic Safety Administration (NHTSA) opened an investigation into 2.88 million Tesla vehicles over issues with its Full Self-Driving system, causing a 2.1% drop in Tesla's shares in early trading on October 13.