Adding Keys

WARNING: This page is about a different car, the 2011 GMC Canyon and 2011 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT:

This procedure only applies to vehicles equipped with a Passkey III+ immobilizer system (RPO BAE).
To initiate, this procedures requires that 2 learned master keys be available.
A total of 10 master keys or valet keys may be programmed to a single vehicle.
This procedure adds keys only. The procedure does not erase previously learned keys.
The keys to be learned must duplicate the mechanical cut of the current key.
If more than one valet key is to be learned, immediately precede each valet key with a learned master key.

With the first previously learned vehicle key, turn ON the ignition, with the engine OFF.
Turn OFF the ignition and remove the key.
With the second previously learned vehicle key, turn ON the ignition, with the engine OFF.
Turn OFF the ignition and remove the key.
Within 10 seconds insert the key to be learned. Turn ON the ignition with the engine OFF. The vehicle has now learned the new key.