P2443Secondary Air Injection

Secondary Air Injection System Switching Valve Stuck Closed (Bank 2)

The control module has determined that the secondary air injection switching valve on bank 2 is stuck closed. The valve should open during cold start to route air into the exhaust. Stuck closed, the bank 2 secondary air system cannot function.

🚗 Yes, in most cases. This emissions fault mainly affects cold-start emissions. Repair it to pass inspection.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Switching valve stuck closed$100-$350

40%

Carbon or a failed solenoid holds the bank 2 valve closed.

#2Vacuum or control fault$50-$250

25%

Missing vacuum or electrical control prevents the valve from opening.

#3Carbon buildup$100-$300

20%

Soot seizes the valve in the closed position.

#4Failed air pump$200-$500

15%

A dead pump produces no flow, mimicking a closed valve.

🩺 Common Symptoms

Check engine light is on
Rough cold-start idle
Higher cold-start emissions
Air injection monitor incomplete

💰 Repair Cost: DIY vs Shop

DIY Cost

$100-$350

Shop Cost

$200-$550

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P2443

1Verify the air pump runs and produces flow at cold start.

2Check vacuum or electrical control to the bank 2 valve.

3Command the valve open with a scan tool and confirm operation.

4Replace the valve if it stays closed, then clear and retest.

❓ Frequently Asked Questions

How does this differ from P2441?

It is the same stuck-closed fault on bank 2 rather than bank 1. Diagnosis and repair are the same.

Is it safe to drive?

Yes, in most cases. It affects cold-start emissions rather than daily drivability.

Should I check the pump first?

Yes. Confirm the air pump runs before replacing the valve, since a dead pump can look similar.

🔗 Related Codes

P2440P2441P2442P0410P0491