My 1999 dodge grand caravan trouble codes are 23 & 55, how do I fix?

SOURCE: 1999 Dodge Grand Caravan horn and Cruise control

I recently had the same issue, but my airbag warning lights also turned on. If this is the case, it might be the clockspring. There is a recall on clocksprings for Caravans 1998 - 2000 I believe. I got it replaced for free in the dealership. Enter your VIN in this site and it will tell you if you are covered in the free replacement warranty.
http://www.chrysler.com/webselfservice/chrysler/index.jsp?screenName=recall&country=us&emailUrl=goToEmailForm%28%27R%27%29

Hope this helps.
Sonny

SOURCE: Is a 2000 Dodge Grand Caravan fuel filler neck usable in a 1999?

yes it will swap and you have to remove it from the bottom of the van remove the screw/clips from inside the filler door and then from underneth disconect the filler tube ti tank and the vent hose to the tank i belive there is a bracket also holding the filler tube to the body with one bolt then it snakes out of the va r insalating is just reverse

SOURCE: My 1999 Dodge Grand Caravan left rear powered vent isn't working.

IF YOUR TALKING ABOUT THE POWER VENT WINDOW.IT MAY BE HYPER EXTENDED LIKE A KNEE OR ELBOW.TRY TAKING A SCREWDRIVER FROM THE OUTSIDE AND PUSHING THE HINGE INWARD JUST ENOUGH TO LET THE MOTOR WORK IT CLOSED.IF THE MOTOR ITSELF ISN'T WORKING PUSH THE HINGE JUST PAST CENTER THEN USE YOUR HAND TO CLOSE THE WINDOW PUSHING IT CLOSED WERE THE MOUNT IS UNTIL YOU CAN GET A NEW MOTOR.HOPE THIS HELPS

SOURCE: Failed Emision test

po442 is evap emission control system leak (small) 1 of the lines for emissions is leaking. po455 is-- emission control system leak (large). turn off light with code scanner after it is fixed.

SOURCE: 2004 Dodge Grand Caravan engine light on, missfire

That is a code for the secondary (spark) circuit on cylinder number 3. It is usually caused by a bad connection between the coil and the plug (take the coil off the plug and check for moisture in the boot). If not, it might be a bad coil...