P0440 Code - Evaporative Emission Control System Malfunction

What Does P0440 Mean?

This indicates that a portion of the EVAP control system is no longer functioning properly. The EVAP system consists of components including (but not limited to) the gas cap, fuel lines, charcoal canister, purge valve, system pressure and flow sensors, electrical wiring and connectors, vacuum lines, the fuel tank, and fuel vapor hoses.

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What are the common causes of P0440 ?

• Some aftermarket accessories and performance modifications
• A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
• A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

How do you troubleshoot P0440 ?

There are currently two main types of cylinder deactivation used today, depending on the type of engine. P0440 code for the pushrod design which uses solenoids to alter the oil pressure delivered to the lifters. In their collapsed state, the lifters are unable to elevate their companion pushrods under the valve rocker arms, resulting in valves that cannot be actuated and remain closed.

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