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Dave Nova
Dave Nova, Cadillac Technician
Category: Cadillac
Satisfied Customers: 1522
Experience:  ASE Master Certification. GM World Class Certification
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Have a 2004 cadillac cst and trying to reprogram a new key

Customer Question

have a 2004 cadillac cst and trying to reprogram a new key since lost the main key to the car. was reading on line to turn key on for ten minutes and thirty seconds and turn off repeat for a total of three time
Submitted: 2 months ago.
Category: Cadillac
Expert:  Marvin the Mechanic replied 2 months ago.

Is this the procedure you did?

Use this procedure after replacing any of the following components:

  • The passkey III+ (PK3+) keys.
  • The theft deterrent control module.
  • The ECM, see important above.

Important: This procedure is not available on vehicles equipped with EXPORT configured theft deterrent control modules.

Important: The vehicle learns the key transponder information and/or passwords on the ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.

  1. With a master passkey III+ (PK3+) key, turn ON the ignition, with the engine OFF.
  2. Observe the Security telltale, after approximately 10 minutes the telltale will turn off.
  3. Turn OFF the ignition, and wait 5 seconds.
  4. Repeat steps 1–3 two more times for a total of 3 cycles or 30 minutes.
  5. With a master PK3+ key, start the vehicle. The vehicle has now learned the key transponder information and the ECM has now learned the fuel continue password.
  6. If additional keys are required to be learned, refer to Adding Keys.
  7. With a scan tool, clear any DTCs.

It is important not to remove the key when you turn the key off.

Does your key have a mark near the top of the key near the plastic part? It might be PK3 or a circle with a plus sign in it.