P0456 Code - EVAP Control System Leak Detected Very Small Leak

What Does P0456 Mean?

P0456 is an OBD-II generic code that the engine control module (ECM) has detected a very small leak in the evaporative system during the vehicle off testing. The test has to fail twice in a row to cause the code to be activated by the ECM.

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What are the common causes of P0456 ?

• Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
• Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
• Defective ECU strategies or components will prevent proper regeneration

How do you troubleshoot P0456 ?

There are currently two main types of cylinder deactivation used today, depending on the type of engine. P0456 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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