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Home >> Jeep >> 2021 >> Grand Cherokee Trackhawk >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> 6.2L - DTCS P2628 To U1504 >> DTC Troubleshooting >> U0109-Lost Communication With Fuel Pump Control Module >> Possible Causes

Possible Causes

Possible Causes
FPCM PWM FEEDBACK CIRCUIT OPEN/HIGH RESISTANCE
FPCM PWM FEEDBACK CIRCUIT SHORTED TO GROUND
FPCM PWM FEEDBACK CIRCUIT SHORTED TO VOLTAGE
FPCM MOTOR FEED 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  .