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Home >> Dodge and Ram >> 2012 >> Journey SE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (3.6L - DTCS P0160 To P0480) >> Diagnosis And Testing >> P0457-Loose Fuel Cap >> Theory Of Operation

Theory Of Operation

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Fuel level is recorded when the ignition key is turned off and is compared to the fuel level when the ignition key is turned back on. The Powertrain Control Module (PCM) recognizes an increase in fuel level and will fail the Large leak test because the fuel cap is broken or not installed properly. GAS CAP will be displayed to inform the owner that the cap is off of loose.

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