The P0416: Secondary Air Injection System Switching Valve B Circuit Open code indicates that the engine control module (ECM) has detected an open circuit in the switching valve B of the secondary air injection system. The secondary air injection system reduces harmful emissions by injecting air into the exhaust stream. An open circuit in switching valve B can lead to increased emissions and potentially affect engine performance.
P0416 – Quick Overview
| Meaning | P0416: Secondary Air Injection System Switching Valve B Circuit Open |
| Is it serious? | Yes, this code can lead to increased emissions, engine performance issues, and potentially cause the vehicle to fail emissions tests. |
| Possible causes | – Open circuit in switching valve B – Faulty switching valve B – Wiring issues |
| How to diagnose? | – Test for open circuit in switching valve B – Replace faulty switching valve B if needed – Inspect and repair wiring issues |
P0416 Meaning
The P0416: Secondary Air Injection System Switching Valve B Circuit Open code means that the ECM has detected an open circuit in switching valve B. This valve controls airflow into the exhaust system to reduce emissions. If the circuit is open, the valve will not function properly, leading to poor air injection into the exhaust stream and higher emissions.
Step-by-step diagnostic guide
Follow these steps to diagnose and resolve the P0416 code by addressing potential causes one by one.
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for other related codes that might provide more information about the secondary air injection system or electrical malfunctions. | OBD-II Scanner |
| Test for Open Circuit in Switching Valve B | Use a multimeter to check for an open circuit in switching valve B. If the circuit is open, the valve or wiring may be faulty. | Multimeter, Manufacturer’s Specifications |
| Replace Faulty Switching Valve B if Needed | If switching valve B is faulty and causing the open circuit, replace it with a new valve to restore proper function. | Replacement Switching Valve B, Wrench Set |
| Inspect and Repair Wiring Issues | Inspect the wiring and connectors for switching valve B for signs of fraying, corrosion, or loose connections. Repair or replace any damaged wiring or connectors as necessary. | Flashlight, Wiring Repair Kit |
| Clear the Code and Test Drive | After completing repairs, clear the P0416 code using an OBD-II scanner. Test drive the vehicle to ensure the issue is resolved and the system functions correctly. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | After the test drive, re-scan the vehicle to confirm that the P0416 code has not returned. If the code reappears, further diagnosis may be required. | OBD-II Scanner |
This diagnostic guide will help you resolve the P0416 code by ensuring that switching valve B and its circuit are functioning properly, allowing the secondary air injection system to operate effectively and reduce emissions while maintaining engine performance.
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Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)