DHCPCD no carrier

Hi,

I tried to connect to a wifi in the Command Line Interface (CLI), but
without sucess, DHCPCD doesn't get an IP.

Connecting to a wifi network in command line:
$ ip link show wlan0 - to verify the wlan0 status
$ sudo ifconfig wlan0 up - turn it on
$ ip link show wlan0 - to check again if it is ok, shows [UP]
$ sudo iwlist wlan0 scan - scan for available networks
$ sudo iwconfig wlan0 essid (name) key (password) - assign to a network

$ dhcpcd wlan0 - when I run DHCPCD to get an IP, it fails to get an
IP, complaining there is no carrier.
Also tried [$ sudo dhcpcd wlan0 -K], without sucess...

Any news on the "FixGobo015" script? ;)