There are 9 choices

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Compressed Natural Gas (CNG)
- (Passenger Side front engine compartment)
Electronic Control Module
- (left hand front under battery)
  - diesel
    - VIN 1 (8th digit)
    - VIN 2 (8th digit)
  - gasoline
    - 6.0L
      - ID 12586242
      - ID 12602802
    - 8.1L
Fuel Injection Control
- (6.6L turbo diesel)
  - (on Passenger Side valve cover)
    - VIN 1 (8th digit)
    - VIN 2 (8th digit)
Throttle Control
- (left hand firewall)

Engine Computer for 2004 GMC Sierra 2500 HD

Fits: Electronic Control Module left hand front under battery diesel VIN 1 8th digit (change)

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