Engine expels water vapor from dipstick 2005 dodge caravan

The PCV allows one way flow and vents pressure (gases) from the engine and sends them to the intake side of the air breather for re-introduction into the air intake system of the engine.
A non-working or stopped up PCV can cause a build up of pressure, which must vent somewhere. The oil dip stick is often the choice, especially if there is not a tight seal at the top of the tube.
White smoke or steam/ vapor usually means water is entering the internal workings of the engine. Head gasket leaks, cracked heads, and cracked blocks are the common source of such entry. Also water leaking into a cylinder will cause hard or poor starting as the piston is working against the volume displacement of the water. Upon cranking any water so leaking will be exited through the exhaust system and leave the vehicle as a white vapor out of the tailpipe.
Considering that most diesel engines have some "blow by", some water may be expelled out the PCV circuit.

It should be located right on the front valve cover passenger side.Nearly a foot away from where you see the dipstick.

If you have a 3.3 or 3.8 engine the PCV valve is located on the back valve cover and un screws counter clockwise careful its only plastic

Look for a large rubber tube attached to the manifold port located on the top left side (passenger) rising up and and then curving down to the rear valve cover pcv port. It is a squeeze, but work the hose off the pcv port, and "voila" the pcv valve is INSIDE the port. Pull it out with its attached grommet. Do not attempt to clean. Replace, only, and save the receipt for the engine warranty. This engine can burn oil if it is a valve seal or manifold plenum problem.

3.3 engines has the egr valve with transducer.you have to replace the whole unit. code p0406 what its trying to tell you your egr valve circuit is short to ground.it has failed .

Code 442 indicates a vapor leak in the EVAP control system. Fuel vapors are routed through hoses to the EVAP charcoal canister, then via purge control valve, are rerouted through intake when engine running. Bad gas cap seal is the usual culprit, which you can try cleaning the seal & filler neck where it screws in, then erase codes & try again & see if it comes back, or may require new gas cap. Other areas to look is at hoses running to & from canister & purge valve for any crack that may be a source of leak.

It is bolted into the rear valve cover near the passenger side.

3.3 and 3.8 engine pcv valves are it the rear head valve cover. they are a pain to remove

I am assuming that you have a V-6 engine.

The pcv valve is located behind the intake about in the middle of the rear valve cover. Remove the hose that goes from the intake to the rear valve cover. The valve pulls out of the valve cover. Sometimes it is difficult to remove.

Valve and tube connection on upper side of the tappet cover and then to intake manifold

Regards Johngee10