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Discussion Starter #1
Hi all,

Got my new Bolt yesterday, and as so many of you are really disappointed at GM lack of technical improvment over the years.

I was inspired by @Pigwich in OK Google, Start the RED CAR!

My plan would be to ditch completly the OnStar stuff and implement via OBD2 a LTE IOT that could report all the needed data in real time, and also precondition the car remotely.

A few use cases:
  • get battery usage data and efficacy based in temperature, and speed.
  • look, unlook and remote start the car.
  • get live battery status and charge ( instead of 30 seconds OnStar refresh delay)
  • connect everything with Google Assistant
  • display car status on Google Nest Hub ( battery charge and range )


Does anybody know what data is available from OBD2 or other data port ? Is data still going through even if the car is powered off ?

I'll keep updating this post with my findings

I am also looking for other developers to join me on a GPL open source GitHub project.
 

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Hi all,

Got my new Bolt yesterday, and as so many of you are really disappointed at GM lack of technical improvment over the years.

I was inspired by @Pigwich in OK Google, Start the RED CAR!

My plan would be to ditch completly the OnStar stuff and implement via OBD2 a LTE IOT that could report all the needed data in real time, and also precondition the car remotely.

A few use cases:
  • get battery usage data and efficacy based in temperature, and speed.
  • look, unlook and remote start the car.
  • get live battery status and charge ( instead of 30 seconds OnStar refresh delay)
  • connect everything with Google Assistant
  • display car status on Google Nest Hub ( battery charge and range )


Does anybody know what data is available from OBD2 or other data port ? Is data still going through even if the car is powered off ?

I'll keep updating this post with my findings

I am also looking for other developers to join me on a GPL open source GitHub project.
There are a whole mess of CAN busses in the car. And none of the really juicy stuff is available on the one by the hood release except the standard fare OBD2, which is still plenty useful. I don't think it stays on long after the car is shut down however. Try a Pi zero with a GSM radio and a CAN hat. There's some company out there peddling vaporware of just such a device. There's a huge Google sheets spreadsheet out there somewhere with all of the PIDs (register locations as we say in the industrial world) and how to format them into useful data.
 

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Discussion Starter #3
Ok, great to know! I was mentioning OBD2 because it's an easy access, but I am also fine connecting directly to a CAN bus too, even if its mean we have to splice some connectors :)

Do you know if there is any docs/ICD that exists on what data bus carry which data ?
 

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I've mentioned in this forum before, but such a product already exists in Korea by a 3rd party precisely because GM does not provide OnStar service in the country. And it apparently does hook onto the OBD-II port, although it might tap into other ports as well. Obviously, the maker isn't disclosing the details but at least I can tell you that it's completely doable. Stuff like monitoring traction battery and remote lock/unlock are all available over LTE using their own smartphone app. There'a a photo of the module about halfway through this page:

 
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