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Home >> Jeep >> 2025 >> Compass Trailhawk >> Repair and Diagnosis >> Engine Performance >> System >> 2.0L - DTCS P0440 To P0463 >> DTC Troubleshooting >> P0456 EVAP System Small Leak >> Possible Causes
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Possible Causes

Possible Causes
EVAP SYSTEM PLUMBING LEAK
CHARCOAL CANISTER LEAKING
FUEL TANK OR FUEL PUMP SEAL LEAKING
ESIM SWITCH OR WIRING ISSUE
ESIM MOUNTING SEAL LEAKING
ESIM INTERNAL CHECK VALVES LEAKING
ESIM MOUNTED INCORRECTLY ON THE CANISTER
PURGE SOLENOID LEAKING
RESTRICTION IN THE CANISTER TUBE BETWEEN THE FUEL TANK AND CHARCOAL CANISTER

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to:  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  .