I have a 2013 Volt that is getting the Service High Voltage Charging System warning. I've checked all the normal causes for this light and everything is pointing to needing to reprogram a couple modules in the car. I have purchased the GM Vcx Nano and will be buying a TSI2Web subscription in order to flash the modules.
Any advice from the smart electrical wizards on this forum? I'm not the most computer literate person but it doesn't seem out of bounds for something I could do.
Here is a link to the write up on how to do the reflash.
https://www.vxdiagshop.com/service/chevy-volt-hpcm-programming-with-vxdiag-sps.html
This write up seems to be better and will be the one I use.
https://docs.google.com/document/u/0/d/e/2PACX-1vRQdXtoFc9J5SRZWRX6bAe7oEMJLWq7oBMMVLPqf1UJ3gqFbbP_c09g8QgAenJZu1Ia-8j25RiRyWqQ/pub?pli=1
The VX manager is unable to find the vcx nano device for some reason. The virtual machine is able to see the vcx nano plugged into my computer but the vx manager is not.
Want solid advice from a ev tech.....take it to chevy and get proper diag. Tis2web is a E36 M3 program and doesn't even work right at a GM dealer and cars are rarely repaired by software so just keep that in mind.
I'm not sure what problem you have with your Volt, and I'm no expert on this, but I have updated the HPCM2 and the BECM back when I found an issue with isolation test resistance. I did use a VCX Nano and AC Delco TDS to tap into the car and complete the updates on each module. The software that came with the VCX was not safe, as I expected, and I wound up formatting a laptop and starting fresh after I did the work. I don't recall much since it was three years ago that I did the work, but here is a link to a post on Reddit that helped me get the car all fixed up.
My Volt has a “Service High Voltage System” alert after the power outages and freeze in TX. Did the outage hurt my car?
I also saved this link from a Facebook group called "Chevy Volt DIY repair and modding group" which might be useful.
https://www.facebook.com/groups/chevyvoltdiy/permalink/834895737290790/
In reply to Nitroracer (Forum Supporter) :
Thank you for replying. I was able to get everything working by uninstalling the vx manager version 1.9 and using the earlier 1.8.6 version instead. After that the reprogramming was pretty straight forward.
In reply to RonnieFnD :
This is a pretty common problem with first gen volts and there is even a tsb about reprogramming the modules. Everything is reprogrammed now and the car is back to operating properly.
Blunder said:
In reply to RonnieFnD :
This is a pretty common problem with first gen volts and there is even a tsb about reprogramming the modules. Everything is reprogrammed now and the car is back to operating properly.
I absolutely get that but fixing these for a living I don't deal in pretty common, I deal in certainty. I just dont wanna see anyone chasing their tail trying to interweb fix their car. Did you find the reason the software corruption occurred in the first place?
In reply to RonnieFnD :
It isn't about software corruption, especially if it is a common problem. More likely there are programming issues that improperly address the graceful aging of equipment, and the reflash corrects that.
I repaired a Colorado with 110k miles with a stalling problem with a reflash. The original programming did not properly alter fuel trims during evap purge after a refueling, so when the purge solenoid would open and get a bunch of fuel vapors instead of relatively fresh air, the engine would flood and stall. Why didn't it occur earlier? My experiences with other vehicles fixed with a reflash suggests that there are some adaptives that the programming does not have a reset/decrementing procedure for, so it can go up but it can never go down, and at some point this causes issues and the only way to reset them is a reflash. Maybe the reflash has corrected programming, maybe just the act of completely wiping the adaptives fixes things.
Not all adaptives can be cleared with a software reset or a battery disconnect, either. Clean a dirty throttle body in a 2001 Northstar engined car, for example, and you'll find that the only way to reset the over-5mph idle speed is a reflash. You can get the idle at a stop to come down, but as soon as you go over 5mph it switches to a different map and suddenly the car wants to idle at 2000 and there is no way it can unlearn that by itself.
And then there's TRANSMISSIONS....
