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What is p0456 code?

What the P0456 code means. 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.

What is a p0456 code?

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.

What is p0456 engine code?

The P0456 engine code means that the pressure has decreased in the Evaporative Emissions System (EVAP system), which is potentially caused by fuel vapors escaping the fuel tank and entering the atmosphere. The Powertrain Control Module (PCM) is responsible for monitoring the fuel tank pressure (FTP).


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