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need voltage at vent valve i.e. 5v/12v etc
Vehicle: 2006 buick lacrosse 3.8l
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1 Answer

HI there

This code does point to an issue at the vent control valve. The voltage at the valve should be battery voltage.

P0449 BUICK - Evaporative Emission Vent Valve Solenoid Malfunction

Read more: https://www.autocodes.com/p0449_buick.html

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