P2442 Code: Secondary Air Injection System Switching Valve Stuck Open Bank 2

The secondary air injection (SAI) system reduces harmful emissions during a cold start. This system pumps air into the exhaust system to burn off any excess hydrocarbons that are created when the engine is warming up. If the powertrain control module (PCM) detects a malfunction in the SAI system, the vehicle’s computer will log a P2442 code on a scan tool.

What Does the P2442 Code Mean?

Diagnostic trouble code P2442 stands for “Secondary Air Injection System Switching Valve Stuck Open Bank 2.” This is a generic powertrain code that can apply to modern vehicles that have OBD-II.

The SAI system uses a pump to send pressurized air to exhaust ports through connecting hoses or an exhaust manifold. The extra air is then routed to the center of the catalytic converter where it can help oxidize unburned hydrocarbons and carbon monoxide into water vapor and carbon dioxide.

The PCM can control the check valves and solenoids in the SAI system. If the PCM detects a stuck open valve in the SAI system, on-board diagnostics (OBD) will register a P2442 code.

P2442 on Some Toyota Vehicles

Code P2442 may appear on some Toyota vehicles. On a 2007 Toyota Tundra 4.7L V8, for example, the code appears because of the following conditions:

• Vacuum switching valve has failed
• Vacuum switching valve control circuit is open or shorted
• Failed air switching valve
• Air pressure sensor has failed
• Damaged air pressure sensor connector (check pins for damage, moisture)
• Air pressure sensor signal circuit is open or shorted
• Failed PCM

Note: The definition of code P2442 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P2442 Code?

• Faulty switching valve
• Failed air injection pump
• Circuit issues, such as a damaged wire or poor connection
• A PCM issue
• Damaged vacuum lines

What are the Common Symptoms of the P2442 Code?

• Illuminated check engine light
• Rough running and misfiring due to improper fuel control

How to Diagnose the P2442 Code

The symptoms of a P2442 code might be too subtle to notice. That’s why we recommend that you take your vehicle to an auto repair shop to get a proper diagnosis.

However, if you feel confident about working on your vehicle, you should start by reviewing its repair manual. Some diagnostic steps might be different for your vehicle. What might work to resolve a P2442 code for a Toyota Tundra might not work for a Ford F-150. Here’s a helpful video to get you started on your DIY journey.

How to Fix the P2442 Code

One of the primary causes of the P2442 code is a failed secondary air injection pump. In some vehicles, this is also called the smog pump. One possible way to fix the code is to replace the faulty secondary air injection pump.

Before you replace this part, make sure you’ve verified that the secondary air injection pump is the main cause of the P2442 code. Otherwise, you might replace a functioning secondary air injection pump.

Find your vehicle’s owner’s manual and download the necessary repair manuals online. Before you start working on your vehicle, make sure to disconnect your battery’s plug from the terminal. You can also wrap one of the terminals with a rubber glove.

Depending on your specific vehicle model, you might need to remove several components before you’re able to access the secondary air injection pump. The intake manifold of some vehicles will need to be completely removed.

The secondary air injection pump of some vehicles will be powered by the vehicle’s serpentine belt, while some air injection pumps might have an independent motor. If your vehicle’s secondary air injection pump is powered by the serpentine belt, then remove the belt by releasing the belt’s tension by inserting a ratchet into the tensioner.

Remove the belt by pushing the tensioner and sliding the belt off the pump’s pulley. Remove clamps around the hoses connecting them to the pump and remove the hose.

Remove any vacuum lines and electrical connections from the pump. Then, you can start loosening the pump’s mounting bolts with a wrench. Once you’ve removed the pump from the vehicle, you can move the new pump into position.

Reinstall the pump’s mounting bolts and tighten them. Afterward, reconnect any wires and vacuum pumps that you might have removed. Then, reconnect the air hose, making sure that the ends are clamped. Reconnect the serpentine belt by pushing the tensioner in a way that allows the belt to slide over the pump’s pulley.

Diagnosing and fixing this error code might involve more steps since every problem is different. Check your manual or look for online resources to help you. This can be a challenging procedure. If you aren’t confident when it comes to DIY repairs, then ask a mechanic to make the repairs for you.