17-21 CHEVROLET GMC SIERRA SILVERADO 3500 6.6 ENGINE COMPUTER ECM ECU 12711509

Here we have a good used engine computer removed from a 2021 Chevrolet 3500hd with the 6.6 duramax. Fully functioning condition with no issues or damage but will need programming to your truck, will come exactly as shown in the images. Should fit most 17-21 GMC 2500/3500 trucks and maybe newer, but please confirm fitment BEFORE buying!