(a) It is a violation of this Chapter for:
        (1) A person, without authority to do so, to damage a
    
vehicle or to damage or remove any part of a vehicle;
        (2) A person, without authority to do so, to tamper
    
with a vehicle or go in it, on it, or work or attempt to work any of its parts, or set or attempt to set it in motion;
        (3) A person to fail to report a vehicle as unclaimed
    
in accordance with the provisions of Section 4-107.
    (b) Sentence. A person convicted of a violation of this Section shall be guilty of a Class A misdemeanor. A person convicted of a violation of this Section a second or subsequent time, shall be guilty of a Class 4 felony.

Attorney's Note

Under the Illinois Statutes, punishments for crimes depend on the classification. In the case of this section:
ClassPrisonFine
Class A misdemeanorup to 1 yearup to $2,500
For details, see § Ill. Comp. Stat. 730 ILCS 5/5-4.5-55