P2440 Possible Causes
- Faulty vacuum switching valve (VSV)
- Vacuum switching valve (VSV) circuit open or shorted
- Poor electrical connection in vacuum switching valve (VSV) circuit
- Faulty pressure sensor
- Faulty air switching valve
How to Fix Code P2440
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
When is Code P2440 Detected?
If the engine control module (ECM) receives the pulsation signal from the sensor despite the ECM commanding the VSV to close the air switching valve, or if the ECM did not receive the sensor signal despite the ECM commanding the VSV to open the valve, the ECM interprets this as a fault in the secondary air injection system and the code is set.
P2440
Possible Symptoms
Illuminated engine light (or service engine soon warning light)
P2440 Meaning
To accelerate catalyst activation during engine warm-up, the air injection system pumps secondary air into the exhaust manifold by pressure. The secondary air is supplied by the air pump and is pumped to the exhaust manifold via the air switching valve. The opening and closing movement of the air switching valve is regulated by the vacuum switching valve (VSV). The air pump and air switching valve are monitored by the engine control module (ECM) and are used to detect malfunctions in this system. The ECM monitors the secondary air injection system and detects malfunctions using a pressure sensor located on the air switching valve.
The ECM observes the pressure in the secondary air passage using the pressure sensor located on the air switching valve in the secondary air injection system. The sensor detects exhaust pressure in the secondary air passage.