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U1800 Diagnostic Trouble Code Discussion for January 2007

Lost Communication With Fuel Injector Control Module

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Trouble Ticket Help Requests for DTC U1800
Help Request Posted
2003 Chevrolet C5500 Kodiak C5C042 6.6L No Start VIN: 1GBE5E1113
U1800: Communication loose with injector control module. This truck is making me crazy, no start cold or hot without either. With scanner monitered Rail pressure, and found pressure lower than spec cranking. Replaced filter and monitered pressure, cranking went to 10 and fired. Cut open fuel filter, found black cove...
January 31, 2007