Question about 2003 Chevrolet Silverado 1500

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A light comes on that looks like a lock around a truck and the truck goes to start but wont

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This is the security lamp. Sound like the computer (BCM-Body Control Module ) does not recognize the ignition key. This could be from the key being worn enough so that the BCM thinks the vehical is trying to be started with the wrong key (theft!) The lock cylinder could be worn enough to cause this also. A newly cut key could also be an issue. The BCM uses a preset resistance value to identify the key. Each key is different. Most GM's can be programed to accept up to 10 keys.Some vehicals must be hooked to a diagnostics scanner to relearn the system. I am hesitant to post the learn procedure here for all to see! Have vehical taken to a good repair facility for proper diagnosis.

Posted on Jan 16, 2009

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