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Shawn Posted on Jan 03, 2017
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I have 20-codes pulled on my 2003 GMC Yukon, does that mean a harness issue could be the problem?

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bigdawg7299

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  • Posted on Jan 04, 2017
bigdawg7299
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Depends on the codes but it is a good indicator that either a harness or ecm has failed.

Lawrence Oravetz

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  • GMC Master 10,558 Answers
  • Posted on Jan 04, 2017
Lawrence Oravetz
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Depends on the codes. More likely the ECU is toast.

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