99 Silverado check engine code P440
May 20th, 2005, 1:28 PM
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99 Silverado check engine code P440
Have replaced gas cap, purge valve, pcv and grommet. hoses look good. Any suggestions. Light is still coming back on. with same code.
February 16th, 2007, 10:05 PM
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RE: 99 Silverado check engine code P440
have u replaced the evap canister? we have a lot of problems with those at the dealership ppl drive down dirty roads alot and they get plugged with dust.
October 28th, 2010, 5:15 PM
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sometimes people forget that air filters and, fuel filters, fuel pressure regulators are all integral parts of the emission system.......... when did you change the air filter last? i would start there by checking it, then clear the code with a diagnostic tool.
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