(Reuters) -Tesla Inc on Tuesday accused a California civil rights agency of rushing to sue businesses without conducting proper investigations, an attempt to go on the offensive as the electric car maker faces claims of widespread race bias at an assembly plant.

Tesla in a 10-page complaint told California's Office of Administrative Law (OAL) that the state Department of Fair Employment and Housing (DFEH) has adopted "underground regulations" that flout requirements it must meet before suing employers.

DFEH in a February lawsuit claimed Tesla's flagship Fremont, California, plant was a racially segregated workplace where Black workers were harassed and discriminated against in terms of job assignments, discipline and pay.

Tuesday's complaint is an attempt to rein in DFEH's authority to pursue discrimination cases by forcing the agency to take additional steps before suing, such as providing businesses with detailed explanations of alleged legal violations and making efforts to settle outside of court.

DFEH and OAL did not respond to requests for comment.

A California state judge on Tuesday said he would likely deny Tesla's motion to pause the lawsuit while the OAL considers the company's new complaint. The judge will hold a hearing on Wednesday.

The lawsuit is one of several pending in California courts to accuse Tesla of tolerating discrimination and sexual harassment at its factories.

A state judge in April awarded $15 million to a Black former elevator operator who says he was subjected to severe racial harassment at the Fremont plant. That decision, which the worker is seeking to appeal, slashed a $137 million jury verdict.