Engine Control Module (ECM) – GM (12721177)

GM Genuine Parts builds this Engine Control Module to the same footprint as the original; the catalogue number is ECM) – GM (12721177. It replaces a module that has lost communication or an output driver. Catalogue application notes: 5.5L, z06. Confirm the number on the part you are removing matches ECM) – GM (12721177 before ordering; superseded numbers are the same component under a later release. Shipped from our US warehouse with tracking.