I have a active code p0499 on my Dakota and I'm getting real bad gas milage 11mpg. what is does this code mean and what do I have to do to fix it?
Nov 26, 2008 at 4:21 PM
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BLUELIGHTNIN6
CERTIFIED EXPERT
16,542 POSTS
Code means Evaporative Emission System Vent Control Circuit High .
The circuit consists of the PCM, wiring and the vent solenoid itself. The most likely culprit is the vent solenoid. The next possible issue would be a broken or corroded wire between the computer and the vent solenoid.