Can a warrant be put out for an unpaid car loan that I have paid on for a year?

The state is Missouri. What happened was I ran into a financial hardship due to a medical issue with my heart. Then my job terminate me while I was on short term disability. Along with that I think the reason for termination was because I was on work comp and was just released prior to going into the hospital for my blood pressure. The car company has someone calling me stating that they are an investigator and will put out warrants and say my car is stolen. Right now I am waiting for my long term disability since I'm out of a job. Meanwhile I am continuously looking for another job and I need the car to do that. So can they threaten to put out a warrant and say my car is stolen?