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  1. Mystery CEL & S1E98, P1EC4 error codes

    Generation 1 Volt (2011-2015)
    I suppose it was bound to happen sometime. My 2011 with 70k miles has been 99.9% flawless. But recently I had a mystery CEL that OnStar could not diagnose. I soon experienced the following: With an empty battery charging at 240v would be interrupted within about 15 minutes of starting. My...