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Re: 05 silverado can't program ecm error codeE4399
Posted to Technical Discussion Forum on 2/26/2024 6 Replies

Hi Dave,

E4399 is a communications failure error. It can be caused by anything that results in SPS not seeing an expected response from the module. Can you read codes AND data from the replacement module? Do the part numbers on the modules match? Does it hav... Login to read more.

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