What is the difference between P0413 and P0414?

Both codes involve the same secondary air switching valve circuit, but they describe opposite electrical faults. P0413 is an open circuit — the path to the solenoid is broken, so it draws no current. P0414 is a shorted circuit — the control wire is shorted to ground or power, or the coil has shorted internally. With P0413 you focus on connectors, broken wiring, and an open solenoid coil.

Can I keep driving with P0413?

Yes. The secondary air system only runs briefly at cold start, so an open switching valve circuit has no effect on driveability. The reasons to fix it are emissions compliance and clearing the check engine light. There is no mechanical urgency from a daily-driving standpoint.

How do I tell if it's the solenoid or the wiring?

Disconnect the switching solenoid and measure its coil resistance with a multimeter. An infinite reading means the coil is open internally and the solenoid is bad. If the coil is in spec, the open is in the wiring or connector — inspect for a disconnected plug, corroded pins, or a heat-chafed wire near the exhaust, and confirm supply voltage and ground at the connector.

Will P0413 cause an emissions test failure?

Yes. P0413 is an emissions-related code, and an active secondary air fault prevents the cold-start readiness monitor from completing. A vehicle with a stored or active P0413 will fail an OBD-II emissions inspection until the fault is repaired and the monitor runs to completion.

OBD-II trouble code

P0413: Secondary Air Injection System Switching Valve A Circuit Open

The engine computer detected an open electrical circuit to the secondary air switching valve A — the wiring or connector is broken, or the solenoid has failed open. The pumped cold-start air can't be routed into the exhaust.

Quick facts

System: Powertrain
Category: Emissions / Secondary Air
Severity: Low severity
Drivable: Usually safe to drive short-term
Repair cost range: $100 – $700
DIY difficulty: Advanced DIY

What does P0413 mean?

The secondary air injection (SAI) system pumps fresh air into the exhaust for the first 30 to 90 seconds after a cold start so unburned fuel keeps combusting and warms the catalytic converter quickly. The switching valve 'A' directs that pumped air into the exhaust and then seals it off. On most systems an electric solenoid (or a vacuum solenoid the ECM energizes) operates the valve.

P0413 means the ECM has detected an electrical open in the switching valve A control circuit. When the module commands the solenoid and looks for the expected current draw, it sees none — the circuit is broken somewhere between the ECM, the wiring, the connector, and the solenoid coil. This is the more specific cousin of P0412 (general circuit malfunction); P0413 points squarely at an open, while P0414 points at a short.

The switching solenoid and its harness sit close to the exhaust manifold, where heat, vibration, and age take a toll. The most common real-world causes are a disconnected or corroded connector, a chafed or heat-damaged wire, or a solenoid whose internal coil has gone open. None of these affect how the car drives, but the open circuit stops the cold-start emissions monitor from completing and blocks emissions compliance.

Common causes

Disconnected, corroded, or loose switching solenoid connector
Open or heat-damaged wiring between the ECM and the switching solenoid
Failed switching solenoid with an open internal coil
Melted or chafed harness near the exhaust manifold
Blown fuse feeding the switching valve circuit
Damaged connector pins from heat or moisture
Poor ground in the switching solenoid control circuit

Symptoms

Check engine light is on
Often the light is the only symptom
Switching valve does not actuate when commanded on a scan tool
Pump may run on cold start but air never reaches the exhaust
Failed emissions inspection because the cold-start monitor will not complete
No driveability impact in normal operation

Diagnostic steps

1.Locate the air switching valve solenoid, typically near the exhaust manifold or on the SAI plumbing.
2.Inspect the connector first for corrosion, backed-out pins, or a loose lock, and reseat it. A disconnected connector is a frequent quick fix.
3.Use a scan tool to actively command the switching solenoid. No actuation and no current draw confirms a real open.
4.Disconnect the solenoid and measure its coil resistance with a multimeter. An infinite (OL) reading means the coil is open internally and the solenoid is bad.
5.Back-probe the connector and check for supply voltage and ground with the key on. Missing voltage points upstream to wiring or a blown fuse.
6.Perform a wiggle test on the harness from the solenoid back toward the ECM to find an intermittent open or a heat-chafed section.
7.If the solenoid coil and wiring test good but the circuit still reads open, inspect the ECM-side connector and the fuse before condemning the module.

Repair cost

$100 – $700

Reseating a connector or repairing a fuse can be under $100. Wiring or connector repair runs $100 to $250. Switching valve solenoid replacement is typically $200 to $600 in parts and labor depending on access near the exhaust manifold.

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DIY vs shop

This is an advanced DIY job. It typically requires specialty tools, scan-tool access, lifting equipment, or careful sequencing to avoid causing new failures. Plan for extended downtime and have a backup vehicle. Most owners are better served by a shop that has done this repair before.