Chevrolet 2008 Tahoe Owner's Manual page 123

If the engine still does not start, and the key appears to
be undamaged, try another ignition key. At this time,
you may also want to check the fuse, see Fuses
and Circuit Breakers on page 5-117. If the engine still
does not start with the other key, your vehicle needs
service. If your vehicle does start, the first key may be
faulty. See your dealer/retailer who can service the
®
PASS-Key III+ to have a new key made. In an
emergency, contact Roadside Assistance.
It is possible for the PASS-Key
the transponder value of a new or replacement key.
Up to 10 keys may be programmed for the vehicle.
The following procedure is for programming additional
keys only. If all the currently programmed keys are
lost or do not operate, you must see your dealer/retailer
or a locksmith who can service PASS-Key
have keys made and programmed to the system.
See your dealer/retailer or a locksmith who can service
®
PASS-Key III+ to get a new key blank that is cut
exactly as the ignition key that operates the system.
®
III+ decoder to learn
®
III+ to
To program the new additional key:
1. Verify that the new key has a
2. Insert the original, already programmed, key in the
ignition and start the engine. If the engine will not
start, see your dealer/retailer for service.
3. After the engine has started, turn the key to
LOCK/OFF, and remove the key.
4. Insert the new key to be programmed and turn it to
the ON/RUN position within five seconds of turning
the ignition to the LOCK/OFF position in Step 3.
The security light will turn off once the key has been
programmed.
5. Repeat Steps 1 through 4 if additional keys are to
be programmed.
If you lose or damage your PASS-Key
your dealer/retailer or a locksmith who can service
®
PASS-Key III+ to have a new key made.
Do not leave the key or device that disarms or
deactivates the theft deterrent system in the vehicle.
1
stamped on it.
®
III+ key, see
2-25