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Home >> Jeep >> 2024 >> Wagoneer Carbide, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 33 (3.0L - DTCS P0355-00 To P0449-00) >> DTC Troubleshooting >> P0440-00-Evaporative Emission System >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2024 Jeep Grand Wagoneer L and 2024 Jeep Grand Wagoneer. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes
EVAP PURGE SOLENOID VACUUM SUPPLY
EVAP PURGE TUBE OBSTRUCTION
OBSTRUCTION IN THE VENT HOSE OR FILTER
ESIM ORIENTATION OR INSTALLED INCORRECTLY
LARGE EVAPORATIVE EMISSION LEAK
ESIM SIGNAL CIRCUIT OPEN
ESIM GROUND CIRCUIT OPEN
EVAPORATIVE SYSTEM INTEGRITY MONITOR (ESIM) SWITCH STUCK OPEN
EVAP PURGE SOLENOID
POWERTRAIN CONTROL MODULE (PCM)

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