• Pre-programmed Engine Control Module (ECM) for a 2018 GMC Sierra Denali 1500, part number 12680656.
  • Programmed 12704475 Engine Control Module for 2018 GM vehicles like the Express 2500, showing the main connectors.
  • Programmed 2018 Express 3500 ECM showing the main connector and part number label for 12704475.

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