P0413 low

Secondary Air Injection System Switching Valve A Circuit Open

The P0413 code means the vehicle's onboard diagnostic system has detected: Secondary Air Injection System Switching Valve A Circuit Open. This is a low severity code.

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Keep driving?: Yes, but fix soon
DIY difficulty: moderate
Estimated cost: $80 - $300 (parts and labor)

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Common Symptoms

Check Engine Light illuminated
No drivability issues during normal operation
Secondary air system does not activate on cold start
Failed emissions test

Probable Causes (Ranked by Likelihood)

Open circuit in switching valve wiring harness Very High
Disconnected or damaged switching valve connector High
Failed switching valve solenoid (open coil) Moderate
Blown fuse in secondary air circuit Moderate

Step-by-Step Diagnostic Procedure

Check the switching valve connector for disconnection or damage
Measure solenoid resistance -- an open reading (OL) confirms a burned-out coil
Check for continuity in the wiring from the ECM to the switching valve
Verify the secondary air system fuse is intact
Apply 12V to the solenoid to test -- no click indicates an open coil

Frequently Asked Questions

Can I drive with code P0413?

Yes. This code only affects the secondary air injection system which operates during cold starts. Normal driving is unaffected, but the code will cause an emissions test failure.

What does circuit open mean for P0413?

Circuit open means there is a break in the electrical path -- either a disconnected connector, a broken wire, or a burned-out solenoid coil that no longer conducts electricity.

Can a blown fuse cause P0413?

Yes. A blown fuse in the secondary air system circuit will prevent power from reaching the switching valve solenoid, which the ECM detects as an open circuit.