Po 108 dodge grand caravan 2002 3.8l - 2001 Dodge Grand Caravan

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: Replacing the starter on 2001 Dodge Grand Caravan

with most front wheel drives you must remove the passenger tire and reach through to the starter bolt with an extension and if I remember write with a 15 mm socket you can reach through and take out the bolt

SOURCE: Heater blower motor replacement -1997 Dodge Grand Caravan

Remove the cover plate on the passenger side of the heater box, 3-4 screws.
Unplug the motor assembly, remove 3-4 more screws that hold the motor in place and pull it down from its position. Get an aftermarket motor and installed it in the original housing with the original squirrel cage.
Installation is the reverse of removal.

SOURCE: 2002 dodge grand caravan fuse box

The fuse box is located under the hood. There is component map printed on the inside of the cover. This tells you on your model where the fuse or relay is located

SOURCE: What is E 400.1 on 2003 Dodge Grand Caravan?

EGR valve failure