U1800

Zmanhaus

Dirty
Mar 4, 2020
2
0
0
Tennessee
My 03 Duramax just died/quit going down the road today just like you switched the key off. Pulled code and it is U1800. Failure to communicate with fuel injector control module. Anyone had this before and what was the fix? checked fuses relays and all wires are good. Is my FICM toast? Thanks!!!
 

zakkb787

<that’s not me...
Sep 29, 2014
2,133
2
38
Granite Falls NC
It’s been a while since I messed with an LB7, but check the harness at the alternator bracket. Notorious for wearing through the insulation and causing issues.
 

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