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 Post subject: Reduced EV range with BCCM update (recall 93M2)
PostPosted: Sun Dec 19, 2021 12:03 pm 
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Joined: Sun Dec 19, 2021 11:54 am
Posts: 1
I recently brought my car in for service and to get the tires replaced. While I was there, the technician mentioned that there was a new recall 93M2 to update the software of the Battery Charging Control Manager (BCCM). Since I had had persistent issues with the green charging light not turning off when the car was fully charged, I said sure, let's go ahead.

We immediately noticed a dramatic difference with the EV only range. Today I did my typical Sunday morning drive to take my son to practice, and noted that where we were previously reliably able to get about 8.5 miles (San Francisco hills, sigh) on EV only, we were now down to just 6 miles. That's a 30% drop in range!

Has anyone else experienced this?

I don't know the details behind the recall and haven't been able to find anything online. Until we know more, I would encourage A3 e-Tron drivers to refuse the recall as it does nothing to improve performance. Maybe there is some alleged safety improvement, but it's likely an edge case with a guaranteed drop in range. I am going to see if I can get the "update" rolled back since it sucks so bad.

Dave in San Francisco


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 Post subject: Re: Reduced EV range with BCCM update (recall 93M2)
PostPosted: Mon Dec 20, 2021 12:48 pm 
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Joined: Sat Dec 18, 2021 1:15 pm
Posts: 1
I recently brought my car in for service and to get the tires replaced. While I was there, the technician mentioned that there was a new recall 93M2 to update the software of the Battery Charging Control Manager (BCCM). Since I had had persistent issues with the green charging light not turning off when the car was fully charged, I said sure, let's go ahead.

We immediately noticed a dramatic difference with the EV only range. Today I did my typical Sunday morning drive to take my son to practice, and noted that where we were previously reliably able to get about 8.5 miles (San Francisco hills, sigh) on EV only, we were now down to just 6 miles. That's a 30% drop in range!

Has anyone else experienced this?

I don't know the details behind the recall and haven't been able to find anything online. Until we know more, I would encourage A3 e-Tron drivers to refuse the recall as it does nothing to improve performance. Maybe there is some alleged safety improvement, but it's likely an edge case with a guaranteed drop in range. I am going to see if I can get the "update" rolled back since it sucks so bad.

Dave in San Francisco[/quote]

Hola buenos días, hace poco compre un cable vag com, con el VCDS, y empezar a mirar todo, y en la centralita de control de carga de la batería de alto voltaje, la carga mínima de la batería estaba en 60% y la carga máxima al 100% algo sin sentido. Asi que cambié el valor a 25% de carga mínima, y de momento he conseguido 6km más de autonomía, y parece ir a más con cada carga, ya iré informando si la autonomía cambia.

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Audi A3 Etron Sline 2016


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 Post subject: Re: Reduced EV range with BCCM update (recall 93M2)
PostPosted: Thu Jan 06, 2022 4:08 pm 
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Joined: Thu Nov 12, 2020 3:48 pm
Posts: 3
Recall 93M2 2021-12-09 - Battery Charging Control Manager Module - Has anyone received a plain language explanation of what this service action consists of? Does this govern the interface between the 12 volt battery and the high voltage battery? Hoping that I'll be able to discontinue my weekly trickle charge to top up the 12 volt (already replaced once as it was not charging properly and died prematurely).

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 Post subject: Re: Reduced EV range with BCCM update (recall 93M2)
PostPosted: Fri Jan 07, 2022 8:59 am 
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Joined: Thu Oct 24, 2019 12:34 pm
Posts: 39
I had the 93M2 update a few week back on my 2017 A3 E Tron. After reading the first post, I've been monitoring it to see if I am getting less EV miles. I have noticed a slight drop but it is also much colder in the AM (40 degrees) so I'm not sure if it's caused by the update. I think the update makes it so the green and red charge lights at the plug turn off when fully charged. They used to intermittently stay on even though charging was completed.


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