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P0499

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P0499 OBD-II Trouble Code: Evaporative Emission System Vent Valve Control Circuit High
P0499 code means the ECM has detected abnormal amounts of pressure in the evaporative emissions system due to clogging or faulty/broken valves.

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Question
I got a 05 pacifica and the head gaskets were bad so I changed them. I put it back together and changed oil and now it won't start.
Hi there. The codes are coming up for the Oxygen Sensor, Oil Pressure Sensor, Evaporative Emission System Vent Valve, and the Air Conditioning Clutch Relay. Since all of these conditions are separate circuits and in different locations, I suspect that...

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