TOKYO — An employee at a California plant run jointly by General Motors and Toyota is accusing her managers of allowing serious defects to go unchecked, including faulty seat belts and braking, and retaliating when she resisted, according to a lawsuit filed earlier this month, according to USA Today.

In the case before Alameda County Superior Court in California, Katy Cameron, a certified auditor who has worked for 23 years at New United Motor Manufacturing, says management routinely deleted or downgraded defects from her reports on vehicles since 2005.