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View Full Version : how to fix an evaporative emissions problem on a 1999 chevy silverado 5.3l engine?


jason c
12-03-2008, 07:27 AM
I connected a OBDII scanner to the truck and it showed code P0440 which is evaporative emissions fault.

junior
12-03-2008, 07:28 AM
This is usually a loose or faulty gas cap. The cap is tested during emissions tests,so the truck's computer must recognize a gas cap fault.