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Compressed Natural Gas (CNG)
- (Passenger Side front engine compartment)
Electronic Control Module
- (left hand front under battery)
  - diesel
  - gasoline
    - 6.0L
    - 8.1L
Fuel Injection Control
- (6.6L turbo diesel)
  - (on Passenger Side valve cover)
Throttle Control
- (left hand firewall)

Engine Computer for 2005 GMC Sierra 3500 HD

Fits: Electronic Control Module left hand front under battery gasoline 8.1L (change)

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