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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)

Engine Computer for 2004 GMC Sierra 1500 HD

Fits: Electronic Control Module left hand front under battery Without hybrid option Without 4.3L ID 12602802 (change)

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