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  1. Chevy Volt Engineering and Design
    Hi Folks, first post for me! (2012 Volt) Has anyone found a schematic or mapped the pins on the two HPCM2 connectors? I have the service high voltage charging system message and my dealer replaced the coolant sensor, which I verified is at 24kohm installed. They told me after the sensor...
  2. Problems, Driver Warnings or DTCs - Gen 2 Volt
    I have a two-month old 2019 Premier. Everything has been working great. Last Thursday night, I was getting ready to leave for a 4-day weekend trip. I was taking another (older) car to leave at the airport and so put the car cover on the new Volt and locked it. Battery was at about 40%...
  3. Li-Ion Battery, Charging, Mgmt System - Chevy Volt
    As Sent to GM in both countries, will be very interesting to see the responses. Hi technical service issue: Hybrid battery coolant maximum levels are DIFFERENT between Australia & USA. GM USA No longer recommend filling the tank to max for a number of years, only to the mid seam and have...
  4. Problems, Driver Warnings or DTCs - Gen 1 Volt
    Today is Dec 19th. One week ago I had routine preventative service on my 2014 Volt. It has about 35K miles on it. Today the "Service High Voltage Charging System" light came on at 2PM PST. OnStar says codes are P1E00, P1FFE, P1FFF. I looked under the hood and the Battery Coolant is...
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