815 ILCS 505/2S
No person may report adverse information to a consumer reporting agency, provide information to a collection agency or take any collection action regarding a cosigner of an obligation unless prior thereto, such person has notified the cosigner by first class mail that the primary obligor has become delinquent or defaulted on the loan, that the cosigner is responsible for the payment of the obligation and that the cosigner must, within 15 days from the date such notice was sent, either pay the amount due under the obligation or make arrangements for payment of the obligation. In the event that the cosigner pays or makes arrangements to pay the obligation, no adverse information shall be reported regarding the cosigner.
Any person violating this Section commits an unlawful practice within the meaning of this Act and, in addition, is liable in a civil action for actual damages of up to $250 plus reasonable attorney's fees.
815 ILCS 505/2S