How to Reset Passlocks on '98 Chevy Trucksby Kenyonda Bradley
Most '98 Chevy trucks came equipped with a General Motors passlock security feature that cuts the fuel supply to the engine if a key that's incompatible with the system is inserted into the ignition. Once the theft-deterrent security feature has been activated on your '98 Chevy truck, you will have to reset the passlock to start the engine. If you have the original key, you can reset the passlock easily.
Insert your registered key into the ignition. Try to start your Chevy truck. If the security feature was activated, you should not be able to start the truck.
Turn the key back to the "Run" position. The security light will start to flash off and on. Keep the key in the "Run" position until the security light stops flashing. This usually takes 10 to 15 minutes. Do not remove the key.
Turn your key clockwise to crank the ignition. Wait for your truck to start, which confirms that you have successfully reset the passlock on your '98 Chevy truck.