• Programmed 2011 Sierra 3500 ECM, part number 12656958, ready for installation.
  • Programmed 12656958 Engine Computer for a 2011 GMC Sierra 2500 with 6.0L engine.
  • Programmed 12656958 Engine Control Module for a 2011 Sierra 3500 6.0L, showing the main connectors.
  • Programmed 2011 Sierra 2500 ECM, part number 12656958, ready for installation on a workbench.
  • Pre-programmed 2011 Silverado 3500 ECM, part number 12656958, ready for installation.

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