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  1. Problems, Driver Warnings or DTCs - Gen 1 Volt
    I just tried to install the OBD reader for the Verizon Hum program. I advise against it. My vehicle is undrivable while the Hum Reader is installed. Upon plugging in the OBD reader and starting the car, I received a reduced propulsion error message and engine not available message. All error...
  2. Generation 1 Chevy Volt (2011-2015)
    I mentioned in another post that I signed up for OnStar's "Protection" package (at a "promotional" rate) when my initial free 3-year period ended. Now I'm researching the somewhat-similar gizmo/service that Verizon sells called Hum. Hum's costs include a one-time $20 activation fee and a $30...
  3. Generation 1 Chevy Volt (2011-2015)
    From day one my CT-500 made a slight hum when under load. About six weeks ago it began to intermittently hum/buzz more loudly during charging. The buzz sounds very much like a loose transformer lamination. I contacted SPX who, in turn, contacted Coulomb. Coulomb policy is to replace...
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