Fits: 2006 Dodge 3500 5.9 diesel using p/n CM849B. Used in good shape. This is the engine computer from a 2006 Dodge 3500 5.9 diesel. Other part numbers CM849B. Our inventory number 4903T16. ECU will need need to get reprogrammed by dealership or locksmith before use or a no start situation will occur because of the factory immobilizer. Pictures shown are actual item you will receive. Parts are used so wear and tear is expected. We try to point out any imperfections and use pictures to determine condition. Any wear and tear items such as brake pads, bearings, gaskets etc. Our interchange is only used as a guideline and not a guarantee. We suggest you use the actual year of the listed part to determine if it will fit your application. If you don’t see an engine part listed don’t hesitate to ask; we have plenty in stock! You need to have a return authorization by contacting us before you return the item. No return on electrical items.