I have collected many TPI parts over the years. Most were purchased 15 +years ago and have been stored inside. This is for the sale of one ECM #1226870, One has a prom installed one does not. I have not tested it. Both have stickers that state they were reconditioned by GM. That work happened before I received them. The one shown in the picture has been sold. Last two are similar. I will refund your purchase price plus $15 for shipping if you decide to return it. I will have a security sticker in place which must be intact for a return.