Why isn't my check engine light coming on when I start my truck
I need help
Your check engine light will come on when you put the key on ON position. When you start the truck, the CEL should not be on. If it is ON, go to your local auto parts stores asking them to read the codes free of charge.
The bulb may be burned out. Do as Toitoine said to check it. If it's not working have the computer scanned. If you just bought this vehicle the light may have been on for a long time and burned out the bulb or, unfortunately an unscrupulous seller, may have removed it. HTH. -Jim
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