
Welcome to the Silverado forum. I hope I or someone else can help you out here. There is alot of good info in here for almost any subject.
I found this for someone else on this forum. This did not work for him. He may or may not of followed the procedure correctly, so its up to you if you want to try it. I personally do not know if this works. I will continue to look for an answer for you though.
This came from nelsonperformance.com This procedure should work for you. It looks time consuming, but ya gotta do what ya gotta do......
ATTENTION: Your vehicle may not start unless this procedure is performed.
GM introduced an anti-theft system in 1996 and newer vehicles. In order for your vehicle to start, you must perform the passkey relearn procedure. If your vehicle’s battery is low, it is recommended a battery charger be hooked up at this time.
This Procedure will take approximately 20-30 minutes.
After your PCM is installed, please perform the following.
You may want to be outside your vehicle so shut the door, roll down the window.
PROCEDURE:
1. Insert key, attempt to start the vehicle and leave the key in the ON position.
In some vehicles, the Battery and Security light will blink for several seconds, and then shut off. Then the Security light will then remain ON. Leave the ignition ON until the Security light goes OFF. This will take more than 5 mins.
2. When the Security light goes OFF, turn the ignition to the OFF position.
Leave ignition OFF for 20 Seconds.
3. Attempt to start the vehicle again and leave the key in the ON position.
In some vehicles, the Battery and Security light will blink for several seconds, and then shut off. Then the Security light will then remain ON. Leave the ignition ON until the Security light goes OFF. This will take more than 5 mins.
4. Turn the ignition to the OFF position for 20 Seconds.
5. Attempt to start the vehicle again and leave the key in the ON position.
In some vehicles, the Battery and Security light will blink for several seconds, and then shut off. Then the Security light will then remain ON. Leave the ignition ON until the Security light goes OFF. This will take more than 5 mins.
6. Once this entire procedure has been completed (three times) your vehicle will start on the fourth attempt.
Note: Some vehicles perform the relearn in a different sequence. You may notice your security light, battery light and abs light will alternate. Once the security light is left out of the sequence that is considered one step. Repeat the procedure two more times and on the fourth time your vehicle will start.
FAQs:
- The procedure was just completed now my car is making a clicking noise when I attempt to start it.
Your battery may have become too weak to crank the engine over.
- I performed the procedure and my vehicle still doesn’t start
Please repeat the procedure again.
210-626-0278
I hope this helps you out. Here is the link to the website, that I got this info from, if you would like to check it out.
http://www.nelsonperformance.com/faqs/passkey.htm