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Home >> Jeep >> 2007 >> Commander Base, 4.7 P, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0581 To P0643 >> P0627-Fuel Pump Relay Circuit >> Possible Causes
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Possible Causes

Possible Causes 
(A916) FUSED B+ CIRCUIT
(F942) FUSED IGNITION SWITCH OUTPUT CIRCUIT
(K31) FUEL PUMP RELAY CONTROL CIRCUIT
(K31) FUEL PUMP RELAY CONTROL CIRCUIT SHORTED TO GROUND
FUEL PUMP RELAY
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .