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p0302 is a misfire in cylinder number 2 white smoke could be from coolant so if the head gasket is blown coolant can leak into the cylinder and cause the misfire are you loosing coolant that might be where its going
Usually high humidity in the exhaust system. Check the exhaust pipe inclination to see if it doesn't allow water to flow into the muffler.
Also after the smoke goes, i.e the car is well warmed up, put the car in Park or Neutral. Tap the gas pedal to get some quick revs. Look for small puffs of white smoke. If you see some then get ready for a rings job. This can be confirmed by removing the spark plugs. They'll have oil deposit on them.
White smoke (steam) indicates antifreeze burning in the cylinder, or trying to, check again to see if it's blue tinted smoke,(almost looks white, but has a tint of blue, and it lingers in the air a lot longer) check the radiator level, and a compression check will determine the condition of each cylinder, evaluate the spark plugs, (there are charts on line) (this determines if the air fuel mixture it correct) let me know what the out come is.
It's normal for a thin white smoke to come out of the exhaust at initial start up. This is caused from moisture built up in the exhaust burning off. However if there is a continuous flow of thick white smoke it could be a blown head gasket causing coolant to burn.
One potential cause is too much gas. It may be running "rich". Your car
may also be burning a little oil. White smoke is water or antifreeze. If you are loosing coolant from the
radiator, it's probably a blown head gasket. If not, it is just
condensation in the exhaust pipe that is evaporating as the pipes heat
up. If the car is running too rich, the unburned gas will cause black
smoke and burning oil smoke will be blue.
You need to check the oil with the dipstick (wipe in down a few times) to see if it looks like a chockalate milk shake. If coolent has made its way into the oil you have blown head gasket. The fuel pump which is usually in the gas tank in most gm vehicles would not cause white smoke, if it failed you car would not start because your engine would not get any gas to the injectors