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SILVERADO 1500 PICKUP
- Electronic Control Module
  - (left hand front under battery)
    - hybrid option (opt HP2)
      - below PCM cover
      - on PCM cover (interface)
    - Without hybrid option
      - 4.3L
      - Without 4.3L
        ID 12586242
        ID 12602802
- Hybrid-Electric
  - (Passenger Side rear engine compartment)
    - (drive motor control)
- Throttle Control
  - (left hand firewall)
SILVERADO 2500 PICKUP
- 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)
SILVERADO 3500 PICKUP
- 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 Chevrolet Silverado

Fits: SILVERADO 2500 PICKUP Electronic Control Module left hand front under battery gasoline 8.1L (change)

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