How to fix code P2440?

Code P2440 is an OBD-II diagnostic trouble code that typically points to issues with the secondary air injection (AIR) system or with catalyst-related readings. The exact meaning varies by vehicle, so start by checking your owner's manual or OEM service information via a scan tool to confirm the precise definition for your model.

What P2440 Means in Your Vehicle

In general, P2440 signals a fault in the vehicle's emission control system related to air management or catalyst readouts. Different makes use the code to flag different problems; some use it for the secondary air injection system (AIR) and its controls, others tie it to catalyst-system efficiency pending a diagnosis. Because of these variations, always refer to your car's service manual or a vehicle-specific code reference when diagnosing.

Common interpretations

Here are the two most common roots behind P2440 across many models:

• Air Injection System Malfunction: problems with the secondary air injection pump, bypass valve, hoses, or wiring that could prevent fresh air from reaching the exhaust stream.


• Catalyst-Related Readouts: signals indicating the catalytic converter’s efficiency is below expected levels (often alongside related P0420/P0430 codes) or a misread from sensors around the cat.

Manufacturers also sometimes pair P2440 with other codes that guide the technician to a specific subsystem, so always review freeze-frame data and related codes for a conclusive path.

Diagnostics: Step-by-Step Approach

Use a systematic approach to verify which subsystem is at fault. Start with meager visual checks and progress to live data and tests supported by a scan tool.

1. Verify the code with a trusted OBD-II scanner and check for related codes (P0410, P0420, P0430, P244X variants) and freeze-frame data to understand driving conditions when the fault occurred.


2. Perform a thorough visual inspection of the secondary air system: belts and pump (if belt-driven), the AIR pump fuse, wiring harnesses, solenoid or valve, and all AIR hoses for cracks or disconnections.


3. Inspect for exhaust leaks, particularly near the catalytic converter and around the exhaust manifold, since leaks can skew O2 sensor readings used by the air-injection system.


4. Check the operation of the AIR system: start the engine and observe whether the AIR pump runs during the cold-start cycle or when the engine is at operating temperature; listen for abnormal noises indicating a seized pump or seized valve.


5. Test electrical components: verify the AIR relay and fuses are good, test the solenoid/valve with a multimeter or by applying controlled voltage, and check for corroded connectors.


6. Inspect sensors that influence air management: downstream O2 sensor, upstream O2 sensor, MAF/MAF/MAP if applicable, and vacuum lines that could cause lean/rich conditions affecting the codes.


7. If the AIR system appears healthy, review OEM bulletins or perform the manufacturer’s official AIR-system self-test; some vehicles require a specific drive cycle to reset readiness tests and run the AIR self-check.


8. Finally, if the fault persists, consider professional diagnostics to rule out PCM software issues or intermittent faults that are not easily reproducible on the street.

Careful documentation of findings and test results will help determine whether the fix is mechanical, electrical, or software-related and whether a professional is needed.

Repairs: How to Fix P2440

Once you’ve pinpointed the faulty subsystem, these are the typical repair steps, in order of likelihood and impact.

1. Repair or replace faulty AIR pump or functioned by a seized pump; replace any damaged belts or defective tensioners if the pump is belt-driven.


2. Replace or repair the AIR bypass valve/solenoid if it is stuck, stuck open, or not actuating; fix wiring harness/connector problems or corrosion in the control circuit.


3. Replace leaking or damaged AIR hoses and check valves; ensure vacuum lines are intact and free of cracks or disconnections.


4. Repair or replace damaged exhaust leaks near the catalytic converter; fix loose connections or cracked manifolds to ensure proper sensor readings and airflow.


5. Replace failing oxygen sensors if readings are out of spec and are contributing to erroneous P2440 readings; in some vehicles, replacing only a downstream sensor may be insufficient if the cat is failing.


6. In rare cases, reflash or update the vehicle’s PCM software if a known bug affects AIR-system diagnostics; this requires dealer tools.


7. Clear the codes and perform a drive cycle to verify the repair; ensure readiness monitors pass for emissions testing.

Costs vary widely depending on the vehicle and the exact fault; simple hose replacements or a pump plus valve can range from a few hundred dollars, while a faulty catalytic converter or major electrical fault may run into the thousands in worst cases. Always request a labor estimate before work begins.

When to Seek Professional Help

If you are uncertain about diagnosing AIR-system components, dealing with electrical harnesses, or if the car fails an emissions test after a repair, professional help is advised. A qualified mechanic can perform advanced diagnostics, verify the correctness of the fix, and ensure the vehicle passes inspection.

Summary

P2440 is a catch-all OBD-II code that typically involves the secondary air injection system or catalytic efficiency readings. A careful, model-specific diagnosis is essential. Start with a visual check of the AIR system, electrical components, and exhaust, then verify operation with live data before carrying out parts replacement. After repairs, clear codes, complete a drive cycle, and confirm readiness for emissions testing.

How to fix code P2440 chevy?

What repairs can fix the P2440 code?

1. Replace faulty air injection valve.
2. Replace faulty one-way check valve.
3. Replace faulty air injection pump.
4. Replace faulty pressure sensor.
5. Repair or replace frayed, broken, or shorted pressure sensor wiring.
6. Repair or replace damaged or corroded pressure sensor connector.

Can you drive with a P2440 code?

WARNING: Repeatedly clearing P2440 and continuing to drive the vehicle with a” Valve Stuck Open” code can cause damage to the Pressure Sensor. Further neglecting this code can even result in damage to the ECM.

Where is the secondary air injection system located?

The secondary air injection system is typically located in the engine bay, with components like the air pump often found in the front passenger side fender well or on the frame rail, and hoses that run to a valve set located under the intake manifold. The exact location can vary depending on the vehicle's make and model. 
This video shows the location of the secondary air injection pump on a Toyota Tundra: 59sTimmy The ToolmanYouTube · Apr 12, 2022

• Air Pump: The electric pump is a major component and can be located in several places, including the fender well on the passenger side or mounted to the frame rail on the driver's side. Some systems may have a pump near the engine itself or on the oil pan.
• Hoses: Rubber hoses connect the pump to the rest of the system, typically running under the intake manifold.
• Valve Set: The hoses connect to a valve set, which is often found in the valley of the engine, under the intake manifold.
• Air Intake: The pump draws air from the engine bay, sometimes through a one-way fitting near the pump itself. 

You can also watch this video to learn about the location of the secondary air injection pump on a GMC Terrain: 56sGT FlipsYouTube · Feb 17, 2025

What is the cause of the code P2440?

The code is logged once the PCM detects an issue with the secondary air-injection system that could point to a valve that's stuck open. The common causes of a P2440 code include a bad secondary air injection valve, a disconnected vacuum hose, a wiring issue, a malfunctioning secondary air pump, and a PCM malfunction.