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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 >> U016C-Lost Communication With Fuel Pump Control Module B >> Possible Causes

Possible Causes

Possible Causes
FPCM 2 PWM FEEDBACK CIRCUIT OPEN/HIGH RESISTANCE
FPCM 2 PWM FEEDBACK CIRCUIT SHORTED TO GROUND
FPCM 2 PWM FEEDBACK CIRCUIT SHORTED TO VOLTAGE
FPCM 2 MOTOR FEED CIRCUIT OPEN/HIGH RESISTANCE
FPCM 2 GROUND CIRCUIT OPEN/HIGH RESISTANCE
FUEL PUMP CONTROL MODULE (FPCM) 2
POWERTRAIN CONTROL MODULE (PCM)

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