Wiki Sudden Loss Of Range With 2019.16.x Software

[ran349]

Thanks. So, the calculation is:

"Estimated Range at 100%" = "Battery Range" / "Charge %"

Is the "Battery Range" value the same as the Rated Miles the car shows?

Yes, with some extra decimal point precision.

 

[Dave46]

Does anyone know how Teslafi calculates the "Estimated Range at 100%"?

It is possible that Teslafi just reads the 100% estimated range that is stored in the car. No calculation needed. I can see that value from the diagnostic OBD2 port. The value in the car calculated by Tesla.

 

[Dave46]

Yes, mid May, the curve changed, here’s my data.

Your car has half the miles as mine. The 100% range on both cars had slowly declined to about 240 miles. Yet on or about May 16 with the same new software version, both car batteries started degrading rapidly. Coincidence? It doesn't feel like it. We need more data from more cars.

 

[faughtz]

View attachment 419378 With data, it doesn’t look like degradation, looks like manipulation.

On 02 Feb 2017 at 100% and 76.4kWh of 76.4kWh remaining capacity, module voltages were about 4.19v.

Today, 14 June 2019, At 97% (where charging halted) and 64.3 kWh out of 66kWh capacity, module voltages are about 4.07v.

Only charged to 97%, after 1hr and 51 minutes on a supercharger.

This looks a lot like the max battery fiasco.
and 691 and 762 hp.
And 85kWh batteries, and ...

 

[sorka]

Lost 20km of max charging within 2 weeks on my S85D. At the 12th of May I was able to charge to 399km at 100% charge. 2 days ago the max charge has dropped to 379km all of a sudden. Temperatures at both charge times were around 18 degrees Celsius.

Called Tesla and they’re telling me the car logs show battery degradation and saying this is “normal”. Has anyone on this forum ever had such a steep loss of max range in such a short period? 5% loss of the max capacity in 2 weeks seems a bit much...
View attachment 415328

What do the relative voltages of each of the 96 strings show on a CANBUS scan with TM-SPY?

 

[sorka]

You could also send a message to [email protected] about the issue and let them know specifically that you have a 13% range loss. They can do diagnostics remotely.

Please keep us posted.

I've sent [email protected] 5 emails in the last several months and they are no longer responding.

 

[sorka]

I’m seeing the same story on a 2014 P85DL.

So glad I'm still on V8.

 

[sorka]

That's pretty close to what Tesla told me on the phone. I understand the range degradation as it's expected. What is unknown is the sudden and drastic range loss after 2019.16.x many owners are experiencing. It almost looks as they have shrunk our usable battery capacity to avoid 100% charging. In other words, If the charging now completes at 100%, it might be only 90% in reality. If true, the question is what's the reason behind it? A poster in another thread stated the 2019.16.x has increased the reserved portion of the pack by 1kW on his car.

There are other possibilities for this sudden range loss. We just do not know.

Would be easy to verify if only someone with tm-spy and a canbus cable would look at what the BMS reports as SOC vs what is displayed on the dash....and what the kwh capacity reported by the BMS is.

 

[sorka]

My capacity was at about 74kWh before the s/w update. I’m now seeing about 63kWh. So my drop was not about 1kWh, but in fact about 10KWh.

How are you reading this number?

 

[sorka]

In response to scheduling an appt, I received the following. My response is below Tesla’s assessment.

How do they explain the sudden loss of range. Gradual reduction in range is or can be normal but I don't know how they can say a sudden drop-off-the-cliff in range is normal or gradual.

Did they ever respond to your last message shown?

 

[faughtz]

And here is 6 January 2018

How are you reading this number?

both tm spy and remote s


I think they are further protecting the battery, expecting no one would notice.

Or it’s like max battery,

Both are trust issues.

 

[Jays200]

I use scan-my-Tesla app and after 2019.6.3.2 update the battery buffer went from 4kWh to 5kWh thereby "stealing" 4kms of range pic in tweet

Jays on Twitter

 

[sorka]

I use scan-my-Tesla app and after 2019.6.3.2 update the battery buffer went from 4kWh to 5kWh thereby "stealing" 4kms of range

When my wife gets home with my elm327, I'll go out and use scan my tesla to record what it is currently. I'm still on v8 and will stay on v8 as long as possible. If Tesla actually takes away range with a software update, I will be suing them without delay.

I removed all wifi aps and turned off wifi. Hopefully they'll only download software while on wifi. The staged software I've had for the last 6 months finally went away and no more yellow clock.

At this point, it's probably time to root the car.

 

[Droschke]

Yes, with some extra decimal point precision.

Ok. That's exactly what I did yesterday manually based on the IC data and during the same ride, but was getting two different results for the total range:

135 RM @55% ==> 135/0.55 = 245.5 miles total range
120 RM @50% ==> 120/0.50 = 240 miles total range

Something not right ...

 

[ran349]

Ok. That's exactly what I did yesterday manually based on the IC data and during the same ride, but was getting two different results for the total range:

135 RM @55% ==> 135/0.55 = 245.5 miles total range
120 RM @50% ==> 120/0.50 = 240 miles total range

Something not right ...

Rounding errors can cause the discrepancy you are seeing there. The ranges of those two calculated values overlap if you take rounding into account. You will get more repeatable numbers if you do the calculation when at a higher percentage charge, like 80 to 90%. Even better, if you take the readings shortly after charging, say to 80 or 90%, you should get pretty repeatable numbers, at least over the short term. But you will still have some rounding uncertainty with the RM value.
That is what I have experienced with data from charging my car.

 

[Droschke]

Rounding errors can cause the discrepancy you are seeing there. The ranges of those two calculated values overlap if you take rounding into account. You will get more repeatable numbers if you do the calculation when at a higher percentage charge, like 80 to 90%. Even better, if you take the readings shortly after charging, say to 80 or 90%, you should get pretty repeatable numbers, at least over the short term. But you will still have some rounding uncertainty with the RM value.
That is what I have experienced with data from charging my car.

Thanks for the feedback. Very helpful.

 

[faughtz]

How are you reading this number?

Remote S and TM Spy. See my note on manipulation above.

 

[faughtz]

How do they explain the sudden loss of range. Gradual reduction in range is or can be normal but I don't know how they can say a sudden drop-off-the-cliff in range is normal or gradual.

Did they ever respond to your last message shown?

No, but it has only been a day.

 

[Droschke]

... it doesn’t look like degradation, looks like manipulation.

That's how I view it.

 

[faughtz]

That's how I view it.

Since the cell/module/battery voltages are reduced, I wonder what the performance impacts are from this theft.