How to Relearn a Procedure on a GMC After Changing

Learn how to relearn a procedure on your GMC vehicle after making changes by following these step-by-step instructions.

To relearn a procedure on a GMC after changing, there are specific steps that need to be followed. The procedure differs depending on the type of Vehicle Theft Deterrent (VTD) system installed in the vehicle. There are three possible systems: Vehicle Anti-Theft System (VATS), Passkey & Passkey II, and Passlock & Passkey III. Each system requires a different relearn procedure.

Key Takeaways

  • Relearning a procedure on a GMC vehicle after changes is important for proper functioning of the vehicle.
  • The relearn procedure varies depending on the type of Vehicle Theft Deterrent (VTD) system installed in the vehicle.
  • For the Passkey II system, a fully charged battery is required and specific ignition key turning steps need to be followed.
  • The Passlock system requires turning the key to the ON position and waiting for the security indicator light to turn off.
  • The Passkey III system involves using a master key and repeating key turning steps to complete the relearn procedure.
  • If the crankshaft position sensor is replaced, it needs to be resynced to the powertrain control module (PCM) using an automotive scan tool.
  • Following the relearn procedures carefully is crucial, and any trouble codes should be cleared using a scan tool if necessary.

Relearning Procedure for Passkey II System

The Passkey II system in your GMC vehicle requires a specific relearning procedure that involves turning the ignition key to different positions. To begin, make sure you have a fully charged battery before starting the process.

Follow these steps:

  1. Insert the ignition key into the key cylinder and turn it to the ON position. Leave it in that position for approximately 11 minutes.
  2. After 11 minutes, turn the ignition key to the OFF position for 30 seconds.
  3. Repeat steps 1 and 2 two more times, totaling three cycles of 11 minutes ON and 30 seconds OFF.
  4. For the final time, turn the ignition switch to the ON position and wait for 30 seconds.

If your engine starts and runs after these steps, it means the relearn procedure for the Passkey II system is complete. Your GMC vehicle is now ready to operate normally.

Key PositionsDuration
ON11 minutes
OFF30 seconds

Remember to follow the relearn procedure carefully to ensure successful completion. If you encounter any issues or have trouble starting your vehicle after attempting the relearn, it is recommended to consult a professional technician for further assistance.

Relearning Procedure for Passlock System

To relearn the Passlock system in your GMC vehicle, follow these instructions for turning the key and waiting for the security indicator light to turn off:

  1. Insert your ignition key into the switch and turn it to the ON position.
  2. Wait for approximately 10 minutes while the vehicle’s security indicator light remains illuminated.
  3. Once the security indicator light turns off, turn the ignition key to the OFF position.
  4. Repeat steps 1-3 two more times, allowing the security indicator light to turn off each time.

By completing this relearn procedure, the Passlock system in your GMC vehicle should be successfully reset. Once the procedure is finished, you can start your engine and resume normal use.

Please note that the Passlock system is just one of the three Vehicle Theft Deterrent (VTD) systems that GMC vehicles may have. It’s important to ensure you are following the correct relearn procedure based on the specific VTD system installed in your vehicle.

If you are unsure which system your GMC vehicle has or encounter any issues during the relearning process, it is recommended to consult the vehicle’s owner’s manual or reach out to a qualified mechanic for assistance.

VTD SystemRelearning Procedure
Passkey IITurn ignition key to ON position for 11 minutes, then OFF position for 30 seconds. Repeat three times, followed by turning the ignition switch to the ON position for 30 seconds.
Passkey IIIInsert master key into ignition switch and turn to ON position for 10 minutes, then OFF position. Repeat two more times.
PasslockTurn key to ON position, wait for security indicator light to turn off. Repeat twice.

Relearning Procedure for Passkey III System

If your GMC vehicle has the Passkey III system, you can relearn the procedure using a master key and following these step-by-step instructions:

  1. Insert the master key into the ignition switch.
  2. Turn the key to the ON position and wait for 10 minutes.
  3. After 10 minutes, the security indicator light will turn off.
  4. Turn the key to the OFF position and remove it from the ignition switch.
  5. Repeat steps 2 and 3 two more times, for a total of three 10-minute cycles.
  6. Once the security indicator light turns off after the third cycle, the relearn procedure is complete.
  7. You can now start your GMC vehicle using the newly relearned procedure.

By following these instructions, you can ensure that your Passkey III system in your GMC vehicle is properly relearned, allowing for smooth operation.

It’s important to note that if you have any trouble codes present, it is recommended to clear them using an automotive scan tool. Clearing any trouble codes will help ensure optimal performance and prevent any potential issues.

Remember, each relearn procedure will vary depending on the type of Vehicle Theft Deterrent system installed in your GMC vehicle. Following the specific steps for your system is crucial to ensure a successful relearn process.

SystemRelearning Procedure
Passkey IITurn the ignition key to the ON position for approximately 11 minutes, then turn it to the OFF position for 30 seconds. Repeat this process three times, followed by turning the ignition switch to the ON position for 30 seconds.
PasslockTurn the key to the ON position and try to start the engine. After 10 minutes, the security indicator light will turn off. Repeat this process twice.
Passkey IIIInsert the master key into the ignition switch and turn it to the ON position. After 10 minutes, the security indicator light will turn off. Repeat this process two more times.

Now armed with the knowledge of the relearning procedures for different VTD systems in your GMC vehicle, you can confidently make any necessary changes or replacements and relearn the procedures accordingly.

Resyncing the Crankshaft Position Sensor

If you’ve replaced the crankshaft position sensor in your GMC vehicle, you’ll need to resync it with the powertrain control module using an automotive scan tool. This procedure is necessary to ensure proper engine operation and performance. Here’s how you can resync the crankshaft position sensor:

  1. Connect the automotive scan tool to the diagnostic data port on your GMC vehicle. The data port is usually located under the dashboard on the driver’s side.
  2. Select the CKP Variation Learn procedure on the scan tool. This procedure allows the powertrain control module to learn the new crankshaft position sensor’s variation and adjust the engine timing accordingly.
  3. Follow the instructions on the scan tool to initiate the CKP Variation Learn procedure. Depending on the specific scan tool model, this process may take up to 10 minutes.
  4. Once the procedure is complete, turn off the engine and then restart it. The engine should now run smoothly with the newly replaced crankshaft position sensor synced to the powertrain control module.

Resyncing the crankshaft position sensor is essential to ensure accurate engine timing and optimal performance of your GMC vehicle. By following these steps using an automotive scan tool, you can effectively complete this relearn procedure.

ProcedureRequirements
Resyncing the Crankshaft Position SensorAutomotive scan tool with CKP Variation Learn capabilities

Remember, it’s crucial to carefully follow the relearn procedures specific to your GMC vehicle’s VTD system. Additionally, if you encounter any trouble codes during the process, be sure to clear them using the scan tool. Resyncing the crankshaft position sensor and performing the required relearning procedures will help maintain the optimal functioning of your GMC vehicle.

Clearing Trouble Codes and Conclusion

After completing a relearn procedure on your GMC vehicle, make sure to clear any trouble codes using a scan tool to ensure optimal performance. Clearing trouble codes is an essential step that shouldn’t be overlooked, as it allows the vehicle’s computer system to reset and accurately monitor its various components.

Using an automotive scan tool, connect it to the diagnostic data port, which is typically located under the dashboard near the steering column. Once connected, follow the instructions on the scan tool to access the trouble codes stored in the vehicle’s computer. The scan tool will provide a detailed list of any codes that need to be cleared.

To clear the trouble codes, select the option on the scan tool that allows you to clear or erase the codes. Confirm the action and wait for the scan tool to complete the process. It’s important to note that clearing the trouble codes will also reset the vehicle’s readiness monitors, so make sure all necessary repairs or maintenance tasks have been addressed before clearing the codes.

In conclusion, relearning a procedure on a GMC vehicle after making changes is crucial for its proper functioning. Whether it’s the Passkey II, Passlock, or Passkey III system, following the correct relearn procedure is essential. Additionally, resyncing the crankshaft position sensor, if replaced, is important for smooth engine operation. Lastly, don’t forget to clear any trouble codes using a scan tool, as this ensures optimal performance and prevents potential issues down the road.

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