AutoCodes – Lexus – P2440 Lexus

P2440 Lexus 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 Lexus 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 13,056

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

What does this mean?

What are the Possible Causes of the DTC P2440 Lexus?

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 Lexus?

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 Lexus 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 Lexus 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 Lexus Code

1. What does the OBDII code P2440 mean on a Lexus?

P2440 indicates that the Secondary Air Injection System Switching Valve for Bank 1 is stuck open, which can cause improper air delivery to the exhaust system.

2. What are the common symptoms of the P2440 code on a Lexus?

Symptoms may include the check engine light turning on, rough engine operation during cold starts, reduced fuel efficiency, and possible failed emissions tests.

3. What causes the P2440 code in a Lexus?

Common causes include a stuck or damaged secondary air injection valve, clogged or damaged air hoses, a faulty air pump, or corroded electrical connections related to the system.

4. Can I drive my Lexus with the P2440 code?

While the car may still be drivable, prolonged operation with this code can lead to reduced performance and potential damage to the catalytic converter.

5. How is the P2440 code diagnosed in a Lexus?

A mechanic typically uses a scan tool to confirm the code, inspects the secondary air injection system components, and tests the switching valve, air pump, and related wiring.

6. What repairs are needed to fix the P2440 code?

Repairs may include replacing the stuck secondary air injection valve, cleaning or replacing air hoses, repairing wiring, or replacing the air pump if itâ€™s faulty.

7. How much does it cost to repair the P2440 code on a Lexus?

The repair cost can range from $300 to $1,200, depending on whether you're replacing the valve, air pump, or other components.

8. What is the purpose of the secondary air injection system in a Lexus?

The secondary air injection system reduces emissions by injecting fresh air into the exhaust during cold starts to help the catalytic converter reach operating temperature more quickly.

9. Can a faulty secondary air injection valve cause engine damage?

While it may not directly damage the engine, a stuck valve can lead to increased emissions, poor performance, and potential damage to the catalytic converter if left unresolved.

10. How can I prevent the P2440 code from recurring in my Lexus?

Regular maintenance, such as inspecting and cleaning air hoses and ensuring the secondary air injection system is free of debris or corrosion, can help prevent this code.