Two problems related to emission control have been reported for the 2005 Chevrolet Silverado 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Chevrolet Silverado 1500 based on all problems reported for the 2005 Silverado 1500.
Continuing problem with loss of acceleration/power but only when it is not raining or when the humidity is below 95%. This results in poor fuel economy. I also witnessed the evap purge solenoid making unusual/loud knocking sounds. Been to dealer 6 times for this performance issue. The only code found was for defective evap canister. It ran better but did not fix it. With my scanner, it takes almost a week to finish system testing on the evap circuit where it only takes one warm-up and cool-down to finish testing on all the other circuits. My suspicion is that the evap purge solenoid needs to be replaced. I'm tired of paying $100 diagnostic fees to be told "there's nothing wrong with the truck". I know better since I've driven and worked on my own trucks for more than 20 years now.
Evap emission failure.