06 TRAILBLAZER SSR 5.3L PCM ECU ECM ENGINE COMPUTER 12604791 VIN PROGRAMMING Featured Products 6L3A-12A650-CDC

6L3A-12A650-CDC

56044551AN

AC3A-12A650-UB

Unit opened up and gears were inspected

06 TRAILBLAZER SSR 5.3L PCM ECU ECM ENGINE COMPUTER 12604791 VIN PROGRAMMING Featured Products 6L3A-12A650-CDCPart Number Service NO: 12596679 and Part Number: 12604791 Please match both of these! ECU has security and requires programming before installation. We offer FREE VIN programming so the ECU arrives and your vehicle will start once a key relearn process is completed. We will send instructions on how to complete this. During chekcout, be sure to put your VIN in the "notes to seller" field, otherwise we'll message after the purchase for your VIN. A