Illinois is a diminished value state, which means you may be entitled to the diminished value of your vehicle after an auto accident. The statute of limitation on diminished value claims in Illinois is 5 years, and Illinois does have uninsured motorist coverage for diminished value. You can't submit a Illinois diminished value claim if you were the at-fault party in an accident, or if the damage was caused by something other than a collision. Illinois Diminished Value - Diminished Value Claims and Appraisals in Illinois Just read it on the internet. Might not be true. I would look into it. @Garlan Garner has been through the ringer on this. Maybe a little $ back in the pocketbook might take the sting away.