Heat a lightly oiled griddle to 350 degrees F (175 degrees C).
Stir pancake mix, pumpkin puree, water, white chocolate chips, pecans, and cinnamon together in a large bowl until just incorporated, adding more water as needed.
Drop batter by 1/2 cup scoops onto the griddle and cook until bubbles form and the edges are dry, 2 to 4 minutes. Flip and cook until browned on the other side, 2 to 4 minutes; repeat with remaining batter.