It was Kang's second run-in with the law in 2016, after he was under investigation for an alleged sexual assault of a woman in a Chicago hotel room in July.
"I'd like to apologize to everyone who is disappointed with me," Kang said through his Seoul-based management company, according to Jeeho Yoo of Yonhap News. "Today, I got behind the wheel after drinking, and committed an irrevocable mistake. I panicked at the moment of the accident and did something that I never should have done."
After Pirates president Frank Coonelly said he's "extremely disappointed" with Kang in a statement of his own, the slugger also extended his apology to the organization.
"I am deeply regretting the incident," he said. "I will humbly accept whatever punishment is deemed fit for my actions."