No, a 15-inch steel wheel from a PT Cruiser is very unlikely to fit a 2003 Grand Caravan. While both are Chrysler vehicles, they have different bolt patterns (the number and arrangement of lug nuts), wheel offsets (how far the wheel's mounting surface is from the centerline), and possibly even different center bore sizes (the hole in the center of the wheel that fits over the hub). Using the wrong wheel can lead to unsafe handling and potential damage to your vehicle.
Always check the specifications of the wheels and your vehicle's requirements before attempting to install any wheel. Consult your owner's manual or a reliable parts website that allows you to specify your Grand Caravan's year and model to find the correct wheel fitment information.
