Some vehicles have a secondary air injection system that provides the air needed for the oxidation process that limits tailpipe emissions. The process takes place in the exhaust manifold or inside the catalytic converter. For this problem there is a code, which is the P2440 fault code , we suggest you read it and find out.
The secondary air injection system has a smog pump or thermactor pump that is electric or belt driven from the crankshaft pulley. The pump draws fresh air through a filter and pushes the air to each exhaust port through connecting hoses or a manifold. If the powertrain control module (PCM) detects a problem with the secondary air injection system, a P2440 code will set.
What does the P2440 code mean?
Diagnostic Trouble Code (DTC) P2440 means “Secondary Air Injection System Switching Valve Stuck”.
The secondary air injection system pumps fresh air into the exhaust system to help burn exhaust emissions when the engine warms up. Depending on the vehicle, the system may supply air to the exhaust manifolds, the catalytic converter, or both at different times. The additional air helps reduce harmful exhaust gases through oxidation . Also, the catalyst heats up faster when air is added to the exhaust manifolds.
The secondary air injection system has check valves and solenoids that are turned on and off by the vehicle’s computer. Once the PCM detects a problem with the secondary air injection system that could point to a stuck open valve, the on-board diagnostics (OBD) will log a P2440 code.
Note: The definition of the P2440 code may vary depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact definition of the code.
What are the common causes of the P2440 code?
A good way to avoid the problem is to know what are the causes that can lead you to a P2440 fault code:
What are the common symptoms of the P2440 code?
Even knowing the causes, sometimes avoiding it is out of our hands, so you can also prevent the problem from becoming even worse if you treat it in time knowing the symptoms:
How to diagnose the P2440 code?
DTC P2440 is a generic powertrain code that can be recorded by various vehicles. While this may be the case, keep in mind that the steps for diagnosis and repair may vary depending on a vehicle’s specifications.
If you are not familiar with the process of diagnosing trouble codes yourself, it is best to take your vehicle to a certified mechanic. But if you think that you have enough experience in auto repair, then you can go ahead and do it yourself.
How to fix the P2440 code?
Trying to fix a P2440 code can be a frustrating and confusing task without the right tools and automotive knowledge. If you’re still unsure of your DIY skills, it’s best to take your vehicle to a professional to have the job done.
If you plan to fix this trouble code yourself, make sure you have the proper manuals before proceeding. Guides like Chilton’s or an ALLDATA subscription contain vehicle-specific repair information, so you may want to refer to them before you begin.