GM Volt Forum banner

1 - 12 of 12 Posts

·
Registered
Joined
·
168 Posts
Discussion Starter #1
Hello

Does anyone know how can you downgrade the ecu software calibration?
I "updated" my Battery Charger Control Module and now it won't work anymore

I want to downgrade it to previous software version

thanks
 

·
Registered
Joined
·
2,336 Posts
Hello

Does anyone know how can you downgrade the ecu software calibration?
I "updated" my Battery Charger Control Module and now it won't work anymore

I want to downgrade it to previous software version

thanks
GM SPS offers no downgrade option as only the latest calibrations are avail and any previous calibrations for modules would have already been removed.

You could attempt to push the latest calibration avail from SPS onto your module again but if this isn't successful this module is more than likely 'bricked' and would have to be replaced.

A reminder in TIS2WEB service programming will prompt the user to only flash the BCCM while the vehicle is plugged in and charging
 

·
Registered
Joined
·
168 Posts
Discussion Starter #3 (Edited)
How can I push the update again?
I can connect to the module and it appears to be alive, just not working properly

I red that article and that is why I did the update, sometimes I would get the errors if I would not disconnect the cord properly
 

·
Registered
16,17 volt
Joined
·
663 Posts
were there other upgrades between the calibration you had and the one you upgraded to for that module
might be a bug fix built on a previous bug fix
 

·
Registered
Joined
·
168 Posts
Discussion Starter #5
Maybe. But the latest calibration should have contained all the fixes

I wonder if maybe I should update another module too.
I can't access the inverter, it asks for key code
 

·
Senior Member
Joined
·
1,027 Posts
you need to call TAC and have them reset it. happens a lot with gm's flaky servers.
 

·
Registered
Joined
·
678 Posts
You may have no choice but to get a dealer involved...
 

·
Registered
Joined
·
168 Posts
Discussion Starter #11
Some progress today:
The local dealer, although not certified for this vehicle, was able to help me and he requested a VCI code in order to be able to reflash the BCCM module
The VCI form did not seem to be meant for this, but mostly for retrofits or other module tasks like installing a used one
They had to select "other" and write down the request by hand

Hopefully they will get a VCI code from GM soon and we can solve it. They told me it takes 1-2 days for the VCI code to arrive

I'm glad that we are making progress but at the same time it's so silly that even the dealer must ask "GM, please let me reprogram this module, pretty please?"
 

·
Registered
Joined
·
168 Posts
Discussion Starter #12
Problem FIXED

The VCI code arrived very quickly

When programming, normally you get a table with calibrations installed on the module and new calibrations to be flashed.
With the VCI programming code entered, all the part with the installed calibrations was blank, to force it to flash the "new" calibrations

The process completed successfully at the dealer (when I flashed it it gave an error after 100%)

Now charging works fine!

Thanks all for the help, hopefully my experience and fix could help someone in the future
 
1 - 12 of 12 Posts
Top