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  1. Problems, Driver Warnings or DTCs - Gen 1 Volt
    2012 Volt was running fine on the generator when I made a quick stop. After starting it again, I noticed unusually loud noise (generator?) coming from under the hood. Upon driving 2 blocks home, I noticed the check engine light on, but the OnStar button was "dead" so I couldn't check for codes...
  2. Generation 1 Chevy Volt (2011-2015)
    Long story short -- does anyone know the exact proper procedure and codes to upgrade the OnStar module when upgrading from the old Gen 1 base stereo to the Navigation head unit? Apparently the procedure on here is missing something. (Also one of the needed cable parts has been discontinued...
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