A federal judge on Thursday gave Musk a one-day extension to file a response in his fight with the SEC.
Musk's lawyers said their client needed more time to reply to the "SEC's unsupported assertions."
Judge Alison J. Nathan of the Southern District of New York gave Musk until Friday to file no more than 8 pages.
In court documents filed this month, SEC lawyers said Musk had made no effort to comply with terms of his September settlement requiring that he create a system for his tweets about Tesla to be reviewed by the company before being sent.
Musk originally got in trouble last fall over tweets claiming he had financing to take the company "private," Musk had agreed to settle with the SEC after the commission said he violated federal securities laws with the Twitter posts.
Musk had claimed Aug. 7 that he was "considering taking Tesla private at $420. Funding secured."