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Error Code SPN707 Auxdig1. Any help

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I have a 2015 Malibu 23LSV. I am a ways away from service so I would like to rounle shoot this myself first.

At low rpms ( idle) I get an error code ( SPN:707 FMI:3 auxdig1 voltage above normal or shorted. ). Any idea what to check to see if I can fix this. As soon as you give it some gas the error code goes inactive. 

Any help would be appreciated as it is a couple hours to local service

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