Unknown Error BMS_a066

[AlexUA]

Also got an error BMS_a066, scheduled appointment in 3 weeks, service did confirmed that battery will be replaced.
M3P
6 Nov 2021 with Panasonic pack
15k km.

For now lost around 10% for last 2 month

So Warsaw service confirmed battery is toast and needs to be replaced.
Worst part is that it will take unknow time, instead of promised 2 days...

 

[seangoggin]

I got the BMS_a066 recently with 88k km on my 2021 Model Y LR and booked an SC appointment. I lost about 80km range with the error.

The Service Centre ran battery balancing for about 18 hours in the hope that was a bad balancing or a software glitch, but today they concluded, that the HV pack needs to be replaced.

I am outside Toronto, they say it is running 2-4 weeks for shipping HV replacement packs currently.
They got me a loaner car (2018 M3). They feel it is best to not drive the car with the battery issue and drained the battery to about 150km.

I have not got an estimate, but assume it will be mostly covered under the HV Battery warranty.

Here is the history of the battery and with the big drop at the end.

View attachment 967379

HV Battery has been replaced with tesla battery 1234422-10-A. They provided a loader.
They charged a $250 diagnostic fee since I am at 88k and my main warranty is done, but covered the HV under the battery warranty.

 

[shevjn]

So Warsaw service confirmed battery is toast and needs to be replaced.
Worst part is that it will take unknow time, instead of promised 2 days...

@AlexUA , could you contact me(097 640 2698) when you have time. Today got same error and planning visit Warsaw service. But have lot questions. Thanks

 

[AlexUA]

So battery replaced. Took 4 working days, instead of promised 2.
Will pickup car in end of week...

 

[kingofl337@gma]

I have a 2021 Model 3 Performance that just popped up yesterday, 72k miles. Appointment on the 14th in Peabody MA.

 

[Dranoel]

2019 M3LR 33K. Got the same error code last week. Service could not tell me the severity of the problem for some reason. Brought the car in Friday and was immediately informed that a new battery was needed. A replacement battery will be installed, ETA Sept 30. Driving their loaner S now.

 

[Dranoel]

2021 M3LR 33K. Got the same error code last week. Service could not tell me the severity of the problem for some reason. Brought the car in Friday and was immediately informed that a new battery was needed. A replacement battery will be installed, ETA Sept 30. Driving their loaner S now

Picked the car up on Tuesday. The warranty replacement was done in a day.

 

[Sj-trekhaak]

Picked the car up on Tuesday. The warranty replacement was done in a day.

Did you need to pay anything? Or where all the cost covered under warranty?

 

[AlexUA]

Did you need to pay anything? Or where all the cost covered under warranty?

under warranty

 

[Dranoel]

Did you need to pay anything? Or where all the cost covered under warranty?

Covered under warranty

 

[iqviewfinder]

2018 M3 LR with ~75k miles. Got the error code last week. Still have a lot of contacts at Tesla so I had one of them do remote diagnostics on my car and confirmed the error. One of the bricks in the pack had around 15% SOC discrepancy compared to rest of the pack. I noticed that when I charged to ~85%, the error went away, and came back when at ~70%. So I suspect that a wire bond broke or something which leads to this brick not discharging with the rest of the pack. This also explains why it’s still safe to drive but with depleted range.

Took it in today, service rep at Fremont factory said all replacement packs are reman, not new. We’ll see if PN/description are on the invoice (no charge - under warranty). Also, my replacement pack was already at the service center, so they said my car should be ready in 2-3 days.