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check engine light/service engine soon light canbe anything. in order to read your codes, you need a reader...I think you can buy them at an autoparts store(or pay for a shop to tell you)
If you do buy one. there is a port under the driver side dash. plug it in and turn the ignition on(do not start your truck) your service engine light will flash a certain number of times. match the number in the book and you will find your problem. after you fix it, you will need to reset your computer.
here is an example of one: http://www.amazon.com/Equus-3123-GM-.../dp/B000EVU8C0
good luck
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-Cody
2001 Silverado LS 1500 Ext. Cab Z71 5.3 vortec
"Sittin on 35's w/ flowmasters"
Service Engine Soon Light
