P2432 Code: Secondary Air Injection System Airflow / Pressure Sensor Circuit Low Bank 1

The secondary air injection (SAI) system in your vehicle is in charge of supplying the air needed during the oxidizing process in the catalytic converter or exhaust manifold. This system is commonly called AIR or air injection reaction. 

Like any other system inside a vehicle, it can malfunction over time. P2432 is one of the trouble codes related to a fault in the secondary air injection system. 

What Does the P2432 Code Mean? 

Diagnostic trouble code (DTC) P2432 stands for “Secondary Air Injection System Airflow/Pressure Sensor Circuit Low Bank 1.” 

Bank 1 refers to the bank of cylinders that contain cylinder #1. 

The SAI system injects fresh air from the outside into the exhaust system during cold engine start up. The air pulled by the SAI pump helps in burning highly rich exhaust gasses that are produced when the engine warms up.

The powertrain control module (PCM) monitors the condition of this system using an air pressure sensor. This sensor monitors the pressure in the air control solenoid valve inlet, which opens and closes at certain temperatures and pressures.

The air pressure sensor uses voltage to send signals to the PCM. Once the PCM detects a voltage or resistance that’s too low or below the normal range that’s set by your vehicle’s manufacturer, it’ll trigger the P2432 code.

Note: The definition of code P2432 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 P2432 Code?

• Bad secondary air injection pump
• Faulty one-way check valve
• Defective air control solenoid valve
• Malfunctioning air pressure sensor
• Wiring and/or connector issues
• An issue with the PCM, such as software in need of an update

What are the Common Symptoms of the P2432 Code?

• Illuminated check engine light
• Stalling
• Rough idle
• Hard start
• SAI system noise
• Poor engine performance

How to Diagnose The P2432 Code

The P2432 code is a generic trouble code that different vehicles can log. While affected cars might exhibit similar symptoms, the steps to determine the underlying cause of the code can vary between different makes and models.

If you’re not confident about diagnosing the problem on your own, it’s a good idea to take your ride to an auto repair shop for a proper diagnosis. Otherwise, you can go ahead and diagnose the issue yourself. To help you get started, here is a video that can give you an idea of what the process might involve:

How to Fix the P2432 Code

Trying to fix a P2432 code can be a complicated task if you don’t have the right tools and know-how. We recommend leaving the job to professionals. However, if you’re a DIYer with advanced technical knowledge and hands-on experience, you can resolve the P2432 code on your own. Be sure to read up on this error code and consult the appropriate repair manual or refer to an online repair database. Vehicle-specific guides are the best resource for this type of issue.