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Home › Jeep › 2018 › Grand Cherokee Trackhawk › Repair and Diagnosis › Engine Performance › System › 6.2L - DTCS P2504 To U1504 › DTC Troubleshooting › U0109-Lost Communication With Fuel Pump Control Module › Default Action

Default Action

When this DTC is active, The FPCM will continue to run the Fuel Pump assembly at 100% duty cycle.
MIL is illuminated.