P0415 Code - Secondary Air Injection System Switching Valve 'B' Circuit Malfunction

What Does P0415 Mean?

OBD-II Code Powertrain Control Module (PCM) failure is defined as a Secondary Air Injection System Switching Valve "B" Circuit

The Secondary Air Injection System pumps outside fresh air into the Exhaust System during cold engine start up. This additional air helps burn up the highly rich exhaust emissions that are produced when the engine is warming up. The Secondary Air System typically has an Air Pump and some tubes or plumbing to route the air. The system also has a solenoid and Check Valve(s) to control the airflow. When the engine control module (PCM) detects a faulty with the Secondary Air Injection System, it will set code P0415.

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What are the common causes of P0415 ?

This problem is most commonly triggered in cold weather conditions. When the one-way check valve which protects the secondary air injection pump goes bad, water in the form of condensation gets into the pump and locks it up. This can cause pump failure, or overload the electrical circuit, blowing the fuse.

Another possibility is that engine exhaust that has become too hot and has damaged the wiring and connections involved in the air injection system.

How do you troubleshoot P0415 ?

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. Look at the plug wires to make sure they are not burnt or laying on the exhaust. Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed.



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