How to Reset a GM Passlock for a Silverado

Written by john smith
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How to Reset a GM Passlock for a Silverado
Reset the GM Silverado Passlock system using your programmed ignition key. (Microchiped Car Key image by Christopher Meder from

The GM Passlock system was first introduced in the mid 1990s as a passive antitheft system. Over time it developed into the Passlock II and the Pass-Key systems, which keep your car engine from running should someone use the wrong ignition key. When the wrong key is put into the ignition in an attempt to crank the vehicle, the system prevents access to the gas. You can reset the Passlock system in your Silverado should this happen, allowing you to use your real key to start the car.

Skill level:
Moderately Easy

Things you need

  • Ignition key

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  1. 1

    Unlock and open the driver's door using the GM key or the key remote.

  2. 2

    Check the driver's side control panel behind the wheel to see if the security light is on or blinking. If you see the light on, someone has attempted to access your GM vehicle with a different key.

  3. 3

    Put the GM key into the ignition cylinder and turn the car to the "On" position. This is two clicks clockwise and is the setting where your car is on, but the ignition isn't being cranked.

  4. 4

    Leave the key in the ignition for two minutes to reset the system. At that point the light will stop flashing, and you can either exit the vehicle or start the engine.

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