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Home >> Chevrolet >> 2017 >> City Express LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 2.0L >> Diagnostic Information And Procedures >> DTC P0456 >> Circuit/System Description
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Circuit/System Description

This diagnosis detects leaks in the EVAP line between the fuel tank and the EVAP Canister Purge Volume Control Solenoid Valve, using the negative pressure caused by the decrease of fuel temperature in the fuel tank after turning the ignition switch OFF. If the ECM judges there are no leaks, the diagnosis will be OK.

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