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If you own a 2004 Chevy 6.6L Duramax diesel truck or are in the market for replacement parts, you’ve probably encountered questions about the Fuel Injection Control Module (FICM). The confusion typically arises because 2004 was a transitional year for this vehicle, with General Motors shifting from the LB7 engine to the LLY engine mid-year. These two engines require different FICMs, and understanding the differences is critical for ensuring compatibility and maintaining your truck’s performance. …