AutoCodes – Subaru – P2440 Subaru

P2440 Subaru Code - Secondary Air Injection System Switching Valve Stuck Open Bank 1

Quick Answer

To accelerate the activation of catalyst when warming up the engine, the air injection system pumps the secondary air to the exhaust manifold by pressure. Common causes include Faulty Vacuum Switching Valve (VSV), Vacuum Switching Valve (VSV) harness is open or shorted, Vacuum Switching Valve (VSV) circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P2440 Subaru indicates Secondary Air Injection System Switching Valve Stuck Open Bank 1.
Common causes: Common causes include Faulty Vacuum Switching Valve (VSV), Vacuum Switching Valve (VSV) harness is open or shorted, Vacuum Switching Valve (VSV) circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 13,785

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2440 Subaru Description

To accelerate the activation of catalyst when warming up the engine, the air injection system pumps the secondary air to the exhaust manifold by pressure. The secondary air is supplied by the air pump and it is pumped to the exhaust manifold through the air switching valve. Open and close movement of the air switching valve is regulated by the Vacuum Switching Valve (VSV).The air pump and the air switching valve are observed by the Engine Control Module (ECM) and are used to detect malfunction in this system. The ECM monitors the secondary air injection system and detects malfunction using a pressure sensor located on the air switching valve.
The ECM observes the pressure in the secondary air passage using the pressure sensor located on the air switching valve in the secondary air injection system. The sensor detects an exhaust pressure in the secondary air passage.

OBDII Code P2440 Subaru - Secondary Air Injection System Switching Valve Stuck Open Bank 1 - AutoCodes.com — P2440 Subaru Code - Secondary Air Injection System Switching Valve Stuck Open Bank 1

What does this mean?

What are the Possible Causes of the DTC P2440 Subaru?

Faulty Vacuum Switching Valve (VSV)
Vacuum Switching Valve (VSV) harness is open or shorted
Vacuum Switching Valve (VSV) circuit poor electrical connection
Faulty Pressure Sensor
Faulty Air Switching Valve

How to Fix the DTC P2440 Subaru?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2440 Subaru code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P2440 Subaru code?

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Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2440 Subaru Code

1. What are the common symptoms of OBDII code P2440 in a Subaru related to the Secondary Air Injection System Switching Valve Stuck Open Bank 1?

- Common symptoms include rough idling, loss of power, increased emissions, and the illumination of the check engine light.

2. What are the possible causes of the P2440 OBDII code in a Subaru?

- The code P2440 typically indicates a malfunction in the secondary air injection system, often caused by a faulty air switching valve or a problem with the air injection pump.

3. How serious is the OBDII code P2440 in a Subaru?

- While the code may not cause immediate harm to the vehicle, it can lead to increased emissions and potential engine performance issues if left unresolved.

4. Can I continue driving my Subaru with the P2440 code present?

- It is not recommended to drive the vehicle with the P2440 code as it may lead to further damage to the engine or emissions system.

5. How can I diagnose the cause of the P2440 code in my Subaru?

- Diagnosis typically involves checking the secondary air injection system components, such as the switching valve and air injection pump, for proper operation and potential malfunctions.

6. What are some repair tips for resolving the P2440 code in a Subaru?

- Repair may involve replacing the faulty switching valve, repairing or replacing the air injection pump, or addressing any wiring or electrical issues in the system.

7. Is it possible to reset the OBDII code P2440 in a Subaru without repairing the issue?

- While clearing the code may temporarily turn off the check engine light, the underlying issue causing the code will persist until properly diagnosed and repaired.

8. How much does it typically cost to repair the P2440 code in a Subaru?

- Repair costs can vary depending on the specific issue causing the code and the labor rates of the repair shop, but it is advisable to budget for diagnostic fees and parts replacement.

9. Can a DIY enthusiast repair the P2440 code in a Subaru?

- Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair the P2440 code themselves, especially if the issue is a simple fix like a loose connection.

10. How can I prevent the recurrence of the P2440 OBDII code in my Subaru?

- Regular maintenance and inspection of the secondary air injection system, including checking for any signs of wear or damage, can help prevent the reoccurrence of the P2440 code in the future.