The “Service High Voltage Charging System” message is a common problem on first generation Volts. Often, the only way to fix the error is to reprogram the BECM and HPCM2 modules (even if nothing is inherently wrong with the vehicle). Before you reprogram the modules, you should see if clearing the codes fixes the issue. Also, make sure the battery coolant is not low. If clearing the codes does not permanently fix the problem, you most likely need to reprogram the modules. This can be accomplished by purchasing a VCX Nano and SPS2 subscription from ACDelco TDS.
GM recently discontinued SPS and replaced it with SPS2, so many of the guides are outdated. I recently reprogrammed the BECM and HPCM2 modules on my Volt and made a video and guide. Hopefully, it will be useful for anyone with the same problem.
GM recently discontinued SPS and replaced it with SPS2, so many of the guides are outdated. I recently reprogrammed the BECM and HPCM2 modules on my Volt and made a video and guide. Hopefully, it will be useful for anyone with the same problem.