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05 silverado can't program ecm error codeE4399
Posted to Technical Discussion Forum on 2/26/2024 18 Replies

2005 silverado 5.3 t engine, reman ecm and original ecm can read codes, can see data on old ecm. When I try and connect gm sps I get an error code E4399 tried 3 different usb wires and a different pass through box same on both boxes and 3 wires. Now I do have ... Login to read more.

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