Weird dc-dc output current in Scan My T3sla

[dawidgora]

Today, I connected the S3XY Buttons bundle and ran Scan my T3sla. I noticed something strange during the installation of the 12V - I am attaching a video.

Is this something I should worry about, or is the negative current/power related to the fact that the 12V battery was being charged from the high-voltage battery?


Video: RPReplay_Final1698748354

 

[KenC]

Interesting. I'd maybe contact the SMT developer, perhaps they would know.

 

[Mike1080i]

Today, I connected the S3XY Buttons bundle and ran Scan my T3sla. I noticed something strange during the installation of the 12V - I am attaching a video.

Is this something I should worry about, or is the negative current/power related to the fact that the 12V battery was being charged from the high-voltage battery?


Video: RPReplay_Final1698748354

I see the same thing here. I'm quite sure the DC-DC converter isn't actually acting that weird. As I recall it started after a Tesla software update (but I don't remember which version) to the car a few months ago and the DC-DC CANbus values SMT is looking for must have changed. So the app is likely seeing some other data in that spot now. The SMT developer will have to update the app to fix the issue.

 

[dawidgora]

Good to know I’m not alone I think I will try to contact SMT. I tried their Discord server but no one replied so far.

 

[dawidgora]

Reply from the developer:

„
Hi,

Yes it's broken, changed from the car side after a firmware update. I don't have a fix, yet. (The SOC expected however I have found the fix for, but I have to fix some Apple technical stuff before I can release a new version, but it should come soon).

- Amund
scan my tesla developer”

 

[GtiMart]

Makes sense. I believe Tesla sometimes change the CAN bus signals / channels and SMT and other scanners need to adjust their mapping tables. That's what it looks like here.