Chassis ECM Communication Onstar Opt UE1 Fits 15 SIERRA 2500 PICKUP 4277801
SIERRA 1500 PICKUP 14 Communication; (OnStar, opt UE1), (center dash, behind radio), w/o voice recognition. SIERRA 2500 PICKUP 15 Communication; (OnStar, opt UE1), (center dash, behind radio), ID 23115625.