Repossession is a civil matter handled through the court system, and it doesn't involve criminal charges like theft. However, it's essential to check the specific laws and regulations applicable in your jurisdiction, as certain exceptions might exist in particular cases.
It's also worth noting that lenders usually take possession of vehicles peacefully with prior warning if they are in default. If there is resistance or any illegal act during the repossession process, there could be potential criminal aspects, but again, this heavily depends on local laws and specific circumstances.