There are 25 choices

• 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)