If your car or truck has an interference engine, the damage will be extensive. That’s because the timing belt keeps the valves and pistons from slamming into each other. When the timing belt breaks, the valves and pistons crash together bending the pistons and damaging the cylinder head or camshaft. Damage can also occur to the piston and cylinder wall.
In a non-interference engine, the pistons and valves aren’t in the same space so they won’t smash together if the timing belt breaks. Though there won’t be extensive engine damage, you will need to have your vehicle towed in for timing belt repair.