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Re: GMC C7500 Speedometer Issue
Posted to HD/Fleet Forum on 12/18/2013

Have you tried IDSS with it? I just did a 5.2 Npr that was dropping out the VSS 2, I didn't realize that it used 2 VSS signals.

With the IDSS I was able to graph out both signals during a test drive and watched the VSS 2 drop out. Login to read more.