Can our trucks throw a code without the "check engine" light coming on?

 

if it is a pending code then yes

 

And if the light for the CEL is out. I know someone on here bought a truck and there was no CEL on when he bought it. Turned out it was throwing codes left and right but the bulb had burned out lol.

 

If it's not a major problem or has anything to do with emissions then yes.

 

Cool. Thanks fellas. I'll have to take it up to auto zone to see if anything specific needs attention.