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  1. Problems, Driver Warnings or DTCs - Gen 1 Volt
    After having to get my 2014 Volt (130K miles) car towed twice: once as car transitioned from battery to engine & got reduced propulsion & died once when I left home with a dead HV battery; after about 5 miles, lost gas engine; "reduced propulsion" & died Second time I decided to have the car...
  2. Generation 1 Chevy Volt (2011-2015)
    Hello, today I went out for a drive, parked my car, and when I came back I was met with the lovely "Service High Voltage Charging System" message, which I have never received before. My OBD scanner pulled 3 codes: P1e00, P0aa6, P1fff. All coolant levels appeared to be good and it drives well on...
  3. Problems, Driver Warnings or DTCs - Gen 1 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...
  4. Problems, Driver Warnings or DTCs - Gen 1 Volt
    After hpcm2 and bcm were reprogrammed, my charging time was reduced to 5hours on 10Amp and 8hours on 6amp. What are your times of charging?
  5. Problems, Driver Warnings or DTCs - Gen 1 Volt
    I started some discutions but nobody answer this simple question. I get the SHVCS message 2 weeks ago and the only solution offered by my dealer service was to update the battery module software and another one. I don't get more than 9.3kwh maximum and as low as 8.9kwh, did your kwh used were...
  6. Problems, Driver Warnings or DTCs - Gen 1 Volt
    All, I apologize for throwing another SHVCS post into the mix, but have had challenges locating a parallel on this forum to my current issue. If someone with experience here can point me to an existing thread suggesting how to resolve this issue, I'll happily look there and delet this post to...
  7. Use, Care & Maintenance - Gen 1 Chevy Volt
    I'm new to this forum but I've owned my 2012 Volt for almost 4 years now. It's been a fantastic car, one that I've thoroughly enjoyed. Some time ago, I received the dreaded "Service High Voltage Charging System" warning message. I did some research and took it in, aware that it was probably...
  8. Problems, Driver Warnings or DTCs - Gen 1 Volt
    Hey there, Happy owner of a 2013 Volt here. Well, happy until last weekend. I'd never had any problems with this car, but on Saturday it showed the "Service High-Voltage Charging System" message. Thankfully it was in my garage at home, so I was able to troubleshoot stuff over 2 days. I pored...
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