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  1. Problems, Driver Warnings or DTCs - Chevy Volt
    I’ve had the WOT defeat plug installed for over a year now and I just started getting the SHVCS error again. I’ve reflashed HPCM2 with SPS, but I still get P1FFF (System/Isolation Coolant Level Sensor Fault Hybrid Battery Charging System Disabled) every other day with POAA6 (Hybrid/EV battery...
  2. Problems, Driver Warnings or DTCs - Chevy Volt
    I was at SFO and attempted to charge from one of the Chargepoints there. Nothing happened, just a "Waiting for Vehicle" on the Chargepoint screen. My dash light went yellow and the dreaded Service High Voltage Charging System" is now a semi-permanent part of my DIC screen. Coolant level is...
  3. Chevy Volt General Discussion, News, and Events
    Hi, I just wanted to let Volt owners in on a simple trick and perhaps save a trip to the dealer. Today after my morning surf i get into my car and see "Service High Voltage Charging System." I called onstar immediately and they ran a few tests. They tell me to go schedule a service at the...
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