This E.C.M. fits the following vehicles: 2003 4.8/5.3/6.0L GMC Sierra (1500, 1500HD, 2500, 2500HD, 3500). This is for one service number 12582605 ECM (Engine control module) that is programmed for your vehicle using the la software updates using your V.I.N. (Vehicle identification number) to exactly match your vehicle. After you purchase the E.C.M. you will need to provide us with your V.I.N so that we can program the E.C.M.
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