One problem related to emission control has been reported for the 2004 Chevrolet Silverado 2500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Chevrolet Silverado 2500 based on all problems reported for the 2004 Silverado 2500.
At 35000 miles the check engine light came on and the dealer replaced parts with the gas tank/fuel line due to it being 'plugged'. 10,000 miles later it happens again but no warranty and after very dissatisfying service at dealer we opted to a new mechanic. He reset the check engine light but 1 week later it was on again. Then he replaced the emissions line and 3 days later the check engine light is on again. One dealer stated that excessive driving on gravel roads leads to this problem that the fuel system is not vented properly. (??) we are ranchers and the majority of our travel takes us on gravel roads. Hopefully someone figures this one out so it can be fixed. . . .