One problem related to check engine light on has been reported for the 2004 Chevrolet 1500. The most recently reported issues are listed below.
The check engine light came on the first time I was accelerating going up a mountain highway ; it was not a very steep grade but the cruise control was not worth using. The engine is a v-8. I had it looked at at a dealership . They found nothing and could not get the light to come back on. After a few days it was back on. The check engine light would go out over night because it was not on when I started driving to work and then after a while it would come on. I have changed oil , air filters and had mechanics clean the sensor. It will go out for a few miles and then come back on. Once it has started coming on after a few miles it will come as soon as I start the engine every time. As I have driven the truck now for 109,000 + miles the light stays on. It does not seem to mean anything but, I always wonder in the back of my mind. . . "is this the time that the check engine light really is warning me?" I have read on some websites that this is a common thing for the 2004 1500 silverado but that Chevrolet charges $1,000 + to fix it. This is the only complaint I have about my 2004 chevy silverado. This is my 6th chevy truck.