U0109 Diagnostic Trouble Code Discussion for December 2025
Lost Communication with Fuel Pump control module
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| Help Request | Posted | |
| 2008 Mercedes-Benz C300 4Matic Sport 3.0L No Start VIN: WDDGF81X78 U0109: Lost Communication with Fuel Pump control module. This C300 has had a bit of work done to it over the past few months, intake assembly, spark plugs, vacuum pump, rear cam plugs, LED headlights, new wheels and tires. I have continuity tested all fuses in the front SAM and Rear SAM, have not found one poppe... |
December 28, 2025 | |
| 2008 Mercedes-Benz C300 4Matic Sport 3.0L No Start VIN: WDDGF81X78 U0109: Lost Communication with Fuel Pump control module. This C300 has had a bit of work done to it over the past few months, intake assembly, spark plugs, vacuum pump, rear cam plugs, LED headlights, new wheels and tires. I have continuity tested all fuses in the front SAM and Rear SAM, have not found one poppe... |
December 30, 2025 |
