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Home >> Jeep >> 2008 >> Commander Base, 4.7 N, RWD >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0339 To P0507 >> P0452-EVAP Pressure Switch Stuck Closed >> Possible Causes
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Possible Causes

Possible Causes 
EVAP PURGE HOSE/TUBE OBSTRUCTION
FRESH AIR FILTER OBSTRUCTION
(K52) EVAP PURGE SOLENOID CONTROL CIRCUIT SHORTED TO GROUND
(K107) ESIM SWITCH SIGNAL CIRCUIT SHORTED TO GROUND
ESM SWITCH
EVAP PURGE SOLENOID
POWERTRAIN CONTROL MODULE (PCM)

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.