Possible causes
– Faulty stop lamp switch
– Blown stop lamp bulb
– Brake switch harness open or shorted
– Brake switch circuit poor electrical connection
– Blown stop lamp bulb
– Brake switch harness open or shorted
– Brake switch circuit poor electrical connection
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P0504 JEEP Description
The Engine Control Module (ECM) has detected a fault in correlation between the two brake switch circuits
JEEP Technical Service Bulletins for P0504 code
2005 JEEP LIBERTY ELECTRICAL SYSTEM
2006 JEEP LIBERTY ELECTRICAL SYSTEM
2005 JEEP GRAND CHEROKEE ELECTRICAL SYSTEM
2006 JEEP GRAND CHEROKEE ELECTRICAL SYSTEM
2005 JEEP LIBERTY ENGINE AND ENGINE COOLING:ENGINE
2006 JEEP LIBERTY 4X4 ENGINE AND ENGINE COOLING:ENGINE
2006 JEEP GRAND CHEROKEE ENGINE AND ENGINE COOLING:ENGINE