A provision of General Motors' $13.4 billion in federal loans automatically places them in default if GM's union workers go on strike, and newspaper reports say Chrysler LLC's $4 billion loan includes similar terms.

A General Motors Corp. filing with the Securities and Exchange Commission detailed the loan provision. The Detroit Free Press and The Detroit News reported Friday, citing unnamed sources, that Chrysler's loan deal has a similar provision.

Chrysler spokeswoman Lori McTavish declined to comment on the newspaper reports.

The United Auto Workers union isn't a party to the deal and hasn't threatened a strike, its most potent weapon against the Detroit automakers.

The UAW and the automakers have a Feb. 17 deadline to agree to concessions to lower labor costs.