• VIN-programmed 2004 Silverado 1500 Engine Control Module 89017739, showing the main computer unit and connectors.
  • Programmed 2004 Trailblazer EXT PCM 12586242 Engine Computer Module, showing the main connectors and part number label.
  • Pre-programmed 2004 Sierra 1500 PCM with service number 12586242, showing connectors.
  • Programmed 2004 Sierra 1500 PCM with service number 12586242, ready for installation.
  • Programmed 2004 Silverado 2500 PCM with service number 12586242 shown on a white background.
  • Front view of the 2004 Silverado 2500 PCM with service number 12586242, showing the main electrical connectors.
  • Programmed 89017739 PCM Engine Control Module with connectors visible.
  • 2004 GM PCM 89017739 Engine Control Module, front view showing connectors.
  • Pre-programmed 2004 Corvette PCM 89017739 Engine Control Module, front view showing connectors.
  • Programmed 89017739 PCM for 2004 GM vehicles, showing the main connectors and housing.
  • Front view of the 2004 GTO PCM 89017739 Engine Control Module with connectors visible.
  • Programmed 89017739 PCM Engine Control Module for 2004 GM vehicles, front view.
  • Front view of the 89017739 PCM for a 2004 Chevrolet Express 2500, showing the main connectors.
  • Programmed 2004 Sierra 1500 PCM with part number 12586243, ready for installation.
  • Front view of the 2004 Avalanche 1500 PCM, part number 12586242, with its three main connection ports clearly visible.
  • Programmed 2004 GM Truck ECM for Silverado, Sierra, and Tahoe, part number 12586242.
  • Programmed 2004 Chevrolet Avalanche 1500 PCM Engine Computer with service number 12586242.
  • Front view of the 2004 Avalanche 1500 ECM 12586242 with its three main electrical connectors visible.
  • Programmed 2004 Avalanche 1500 PCM 12586242 Engine Computer Module, showing the main connectors.
  • Programmed 2004 Trailblazer EXT PCM with service number 12586242, ready for installation.

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