• Front view of the 2004 Sierra 3500 ECM, part number 12586242, showing the main electrical connectors.
  • A pre-programmed 2004 Sierra 3500 PCM, part number 12586242, ready for installation.
  • Programmed 2004 GMC Sierra 2500 PCM Engine Computer Module 12586242
  • Front view of a 2004 Sierra 2500 PCM Powertrain Control Module with service number 12586242, showing the main electrical connector ports.
  • Pre-programmed 2004 Sierra 2500 PCM, part number 12586242, ready for installation.
  • Programmed 2004 Sierra 2500 PCM with service number 12586242, ready for installation.
  • A pre-programmed 2004 Sierra 2500 PCM, part number 12586242, ready for installation.
  • Pre-programmed 2004 Sierra 2500 PCM, part number 12586242, ready for installation.
  • A VIN-programmed 2004 Sierra 2500 PCM, part number 12586242, ready for installation.
  • 2004 Sierra 2500 PCM 12586242, pre-programmed and ready for installation.
  • Programmed 2004 Sierra 2500 PCM Engine Computer Module 12586242, front view with connectors.
  • Programmed 2004 Sierra 2500 PCM, part number 12586242, showing the main connectors and housing.
  • Programmed 2004 Sierra 2500 PCM part number 12586242, ready for installation.
  • Programmed 2004 Silverado 2500 PCM with service number 12586242 shown on a white background.
  • A close-up of the 2004 Silverado 2500 PCM, part number 12586242, showing the main connectors for installation.
  • A VIN-programmed 2004 Silverado 2500 PCM, part number 12586242, ready for installation.
  • Programmed 2004 Silverado 2500 PCM 12586242 installed in the engine bay.
  • A pre-programmed 2004 GM Truck ECM, part number 12586242, ready for installation in a Silverado or Sierra.
  • Programmed 2004 Silverado 2500 PCM, part number 12586242, ready for installation.
  • A pre-programmed 2004 Silverado PCM, part number 12586242, ready for installation in a GM truck.

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