2013 Chevrolet Volt
For those who are unaware, the only way to fix the “Service High Voltage Charging System” error is to reprogram the BECM and HPCM2 modules (even if nothing is inherently wrong with the vehicle). 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 GM recently discontinued SPS and replaced it with SPS2, so many of the guides are outdated.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.