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 28, 2010 at 4:30 PM
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FACTORYJACK
  • ✓Experienced Mechanic
  • 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.
Nov 30, 2010 at 10:08 PM
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