GM Volt Forum banner


  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...