In August, authorities accused Alexander City, Alabama-based SL Alabama in federal court of violating child labor laws.
The action against SL Alabama, which supplies lights and mirrors for Hyundai and Kia assembly plants in the U.S. South, came following a July Reuters article that documented child labor practices at another auto parts supplier in the state, Hyundai-owned SMART Alabama LLC.
SL Alabama agreed to implement new monitoring and training programs, the federal regulator said.
"Our investigation found SL Alabama engaged in oppressive child labor," said Kenneth Stripling, DOL's Wage and Hours Division Director in Birmingham, Alabama, in the statement.
Regulators said plant operators are accountable for child labor violations even when unauthorized employees are brought in by third-party recruiting firms.