P0414 – OBD-II DTC

OBD-II DTC P0414 – Secondary Air Injection System Switching Valve A Circuit Open

DTC P0414 meaning

DTC P0414 refers to a problem with the Secondary Air Injection System, specifically indicating that the Switching Valve A Circuit is open. This system is designed to reduce emissions by injecting air into the exhaust stream during cold starts, helping to burn off excess hydrocarbons. When the circuit is open, it means that the Engine Control Module (ECM) has detected a fault in the electrical circuit that controls the switching valve, which can lead to improper operation of the air injection system.

DTC P0414 symptoms

Common symptoms associated with DTC P0414 may include:

• Illuminated Check Engine Light
• Increased emissions during vehicle operation
• Rough idling or stalling
• Decreased fuel efficiency
• Possible failure during emissions testing

DTC P0414 causes

Several factors can lead to the triggering of DTC P0414, including:

• Faulty secondary air injection switching valve
• Open or shorted wiring in the switching valve circuit
• Corroded or damaged connectors
• Faulty Engine Control Module (ECM)
• Vacuum leaks in the air injection system

DTC P0414 seriousness

The seriousness of DTC P0414 can vary. While it may not cause immediate drivability issues, it can lead to increased emissions and potential failure in emissions testing. Ignoring this code can result in further damage to the secondary air injection system or other related components, leading to more costly repairs in the future.

How to diagnose DTC P0414

To diagnose DTC P0414, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the P0414 code.
2. Inspect the wiring and connectors related to the secondary air injection system for damage or corrosion.
3. Test the secondary air injection switching valve for proper operation using a multimeter.
4. Check for vacuum leaks in the air injection system.
5. Examine the ECM for any faults or updates that may be necessary.

How to fix DTC P0414 step-by-step instructions

To fix DTC P0414, follow these step-by-step instructions:

1. Repair or replace any damaged wiring or connectors found during diagnosis.
2. If the secondary air injection switching valve is faulty, replace it with a new one.
3. Ensure all vacuum lines are intact and replace any that are cracked or leaking.
4. Clear the DTC using an OBD-II scanner.
5. Start the engine and allow it to reach operating temperature, then perform a test drive to see if the code returns.

How to erase DTC P0414

To erase DTC P0414, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the “Erase Codes” or “Clear DTCs” option on the scanner.
4. Confirm the action to clear the codes.
5. Disconnect the scanner and start the engine to ensure the code does not reappear.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.