Where is the block heater located on a gmc sierra 2500hd?

The block heater on a GMC Sierra 2500HD is typically located on the engine block, near the oil pan. It is often found on the driver's side of the engine, close to the front, and is usually a cord that can be plugged into a standard electrical outlet. If you're having difficulty locating it, consulting the owner's manual can provide specific guidance for your model year.