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Home >> Jeep >> 2019 >> Renegade Trailhawk >> Repair and Diagnosis >> Engine Performance >> System >> 1.3L - DTCS P1E09 To U0121 >> DTC Troubleshooting >> U0109-Lost Communication With Fuel Pump Control Module >> Possible Causes
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Possible Causes

Possible Causes
FPCM FEEDBACK RETURN CIRCUIT OPEN/HIGH RESISTANCE
FPCM FEEDBACK RETURN CIRCUIT SHORTED TO GROUND
FPCM FEEDBACK RETURN CIRCUIT SHORTED TO VOLTAGE
FUEL PUMP CONTROL OUTPUT CIRCUIT OPEN/HIGH RESISTANCE
FPCM GROUND CIRCUIT OPEN/HIGH RESISTANCE
FUEL PUMP CONTROL MODULE (FPCM)
POWERTRAIN CONTROL MODULE (PCM)

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