There are 6 choices

Choose One

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 2003 GMC Sierra 3500

Attention!

There are 6 choices for the 2003 GMC Sierra 3500 Engine Computer !!!
Choose Your Option

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

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