Code 449

2004 CADILLAC DEVILLE
V8
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PMASPKS
  • MEMBER
  • 7 POSTS
I have a code 449. What is this? Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction
Nov 29, 2010 at 12:30 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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FACTORYJACK
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 4,159 POSTS
It can relate to a faulty vent solenoid valve back near the tank, a control circuit fault, or even a control module. To test it efficiently, a scan tool would be best, one that has capability to control the solenoid. A simple test light in place of the solenoid will tell you if the circuit is capable of being controlled, and also test the solenoid for operation.
Dec 1, 2010 at 6:08 AM
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