2007 Dodge Durango P0412 Secondary Air Injection System Switching Valve

Question

My check engine light popped on yesterday with code P0412. I can hear a loud hairdryer-like noise for about a minute when I first start the truck in the morning. It seems to run fine otherwise, but I need to clear this for emissions testing next week.

Tom Patel · Accepted Answer

The issue was a failed Secondary Air Injection Solenoid (Part #53032822AA). I bench tested the old one and the internal coil had an open circuit. I replaced the solenoid and cleaned out some carbon buildup in the ports with carb cleaner. Total cost was about $85 for the Mopar part and 45 minutes of labor. CEL cleared and hasn't returned after three cold start cycles.

Rachel Nguyen · Answer

Usually P0412 is an electrical circuit fault. Check the connector at the solenoid valve for corrosion or backed out pins, as water often gets into those harnesses on the 4.7L engines.

Chris Donovan · Answer

If you hear that hairdryer noise, your pump is definitely running, but the switching valve might not be opening to let the air into the exhaust manifold. You should verify if you have 12V at the solenoid when the pump is active.

backyard_bart · Answer

Take a look at the vacuum lines leading to the diaphragm of the valve. If the vacuum solenoid isn't pulling the valve open, the pump will dead-head and make a lot of noise while the computer registers a flow or circuit error.

2007 Dodge Durango P0412 Secondary Air Injection System Switching Valve

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