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I have a 1999 STS and the "Service Engine Soon" light is on. When i pulled the code it came up as .. Code P1646.. Evaporative emission (EVAP) vent Solenoid Control Circuit.

Does anyone have a clue as to what this is? And costs to repair?
 

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White Diamond '03 DHS (with DTS floor shift)
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The EVAP system takes evaporative gas fumes from the tank and burns them. The EVAP control valve and solenoid are on the rear cam cover I believe on a '99. It can be identified by an electrical plug on the solenoid and I think there are two vacuum lines to the valve. Cost should not be terribly high.
 
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