U0109: Lost Communication With Fuel Pump Control Module A
What Does U0109 Mean?
U0109 is a diagnostic trouble code indicating: Lost Communication With Fuel Pump Control Module A. This code relates to the network communication system. It has been reported in NHTSA complaints across 4 different vehicle models.
Symptoms of U0109
- ⚠️ Check engine light illuminated
- ⚠️ Engine stalling or dying
- ⚠️ Vehicle won't start
Common Causes
- 🔍 Weak or failing fuel pump
- 🔍 Sensor or control module malfunction
U0109 Reports by Year
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"I HAVE THIS ERROR CODE FROM A OBD-2 CODE READER FROM AUTOZONE. DEALERSHIP DIDN'T GIVE ME ANY FEESBACK ON THE CHECK ENGINE ISSUE WHEN I HAD IT IN FOR A FUEL TANK ISSUE. ERROR CODE IS 'U0109 LOST COMMUNICATION WITH FUEL PUMP CONTROL MODULE (FPCM)' THE CAR SAT IN THE DRIVEWAY ALL SUMMER LONG WITH A FUL"
— Ford Focus owner, 08/01/2018
"SEVERAL STALLS FOLLOWED BY CRANK NO START CONDITIONS OVER SEVERAL MONTHS WITH NO ASSOCIATED CHECK ENGINE LIGHT, CODE P0627 WHILE VEHICLE IN MOTION. 4M AUTO SERVICE CENTER ABILENE TX PERFORMED FUSE 27 RELOCATION TO FUSE 73 ACCOMPLISHED. VEHICLE RETURNED TO SERVICE. SEVERAL STALLS FOLLOWED BY CRAN"
— Ford Expedition owner, 01/08/2020
"ADDITIONALLY, A SMALL NUMBER OF 2007-2012 MODEL YEAR VEHICLES THAT INCLUDE; 2008-2013 CHEVROLET AVALANCHE, 2008-2009 CHEVROLET COLORADO VEHICLES; 2007-2013 CHEVROLET SILVERADO, 2008-2014 SUBURBAN, AND TAHOE VEHICLES; 2008-2013 GMC SIERRA AND 2009-2012 YUKON VEHICLES; 2008-2009 GMC CANYON VEHICLES; 2"
— Chevrolet Silverado owner, 04/15/2019
Source: NHTSA Complaints Database
Most Reported Vehicles for U0109
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | CHEVROLET SILVERADO | |
| 2 | FORD FOCUS | |
| 3 | FORD EXPEDITION | |
| 4 | CHEVROLET CRUZE |
U0109 Reports by Vehicle
Detailed NHTSA complaint analysis for each vehicle model.
Frequently Asked Questions
What causes communication codes?
Can a bad battery cause network codes?
What To Do Next
Possible Fixes
- 🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
- 🔧 Test the relevant sensor(s) with a multimeter before replacing
- 🔧 Check battery voltage and ground connections; inspect CAN bus wiring
- 🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)
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1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.