can you program a 3rd key using the 2 originals on a 2010 caravan. how?

 

As far as i know the keys need to be program with a witech.Because the starscan doesn't work with the 2010 cars or trucks.

 

No, the new fobik keys have to be programmed with a scan tool

 

this actually not 100% true if you have the 2 then 3rd you can program it. i just did. works all functions on remote and also starts vehicle. all i need is to cut key now.

The same as from the 2008 owners manual:
"Customer Key Programming
If you have two valid RKE transmitters with integrated
keys, you can program new transmitters to the system by
performing the following steps:
1. Insert the first valid integrated key into the ignition
switch and turn the ignition switch to the ON position for
at least three seconds, but no longer than 15 seconds.
Turn the ignition switch to the LOCK position and
remove the first key.
2. Insert the second valid integrated key and turn the
ignition switch to the ON position within 15 seconds.
After 10 seconds, a chime will sound and the Vehicle
Security Alarm Indicator Light will begin to flash. Turn
the ignition switch to the LOCK position and remove the
second key.
3. Insert a blank integrated key into the ignition switch
and turn the ignition switch to the ON position within 60
seconds. After 10 seconds, a single chime will sound and
the Vehicle Security Alarm Indicator Light will stop
flashing, turn on again for three seconds, and then turn
off.
The new integrated key is programmed. The Remote
Keyless Entry (RKE) transmitter will also be programmed
during this procedure.
Repeat this procedure to program up to eight keys. If you
do not have a programmed RKE transmitter with integrated
key, contact your authorized dealer for details."