Here we have a used engine bay wiring harness removed from a 2023 GMC 3500hd with the 6.6 L5P Duramax and allison transmission. This is the harness that runs around the engine, NOT the one that sits right on the engine and plugs into the injectors. This is used, but removed from a running and driving truck, may have cosmetic deficiencies and is missing one plug end. This will fit most 19-23 trucks with the L5P engine but please compare it to your existing harness plugs to ensure its the one you need, these are non returnable. if you need any parts just inquire.