Mods for your Chevrolet, GMC, Cadillac and Buick

Cars, trucks and SUVs from Chevrolet, GMC, Cadillac and Buick.

All 13 mods

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What owners want

Charge with your surplus solar power
Improve the infotainment system

Available mods

Start with one of these

OnStar2MQTTSelf-hosted server

Bring OnStar readings and controls into Home Assistant

Example Bolt EV Home Assistant dashboard with battery, range, tires and charging readings

48stars on GitHubActive. Last commit 6h ago.

Best if: You have US or Canadian OnStar access and an MQTT server
Catch: Eligible connected services are still required, and login may need a Firefox token helper

Volt TrackerAndroid app

Keep Volt battery readings and trips on your phone

0stars on GitHubActive. Last commit 6d ago.

Best if: You have a Volt and want Android logging without OnStar
Catch: The author tests a 2017 Volt; some readings and controls remain unverified

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Open Vehicle Monitoring SystemFirmware mod

Keep vehicle and battery data on your own system

873stars on GitHubActive. Last commit 1w ago.

Devices: CTS 2008–14 and CT5 2020–26; Bolt EV 2017–18, Volt, Corvette C6Also works with Multiple manufacturers, BMW, MINI, BYD, Maxus, Hyundai, Kia, Jaguar, Mercedes-Benz, MG, Nissan, Renault, Citroën, Fiat, Opel, Peugeot, Subaru, Tesla, Toyota, SEAT, Škoda, Volkswagen, Energica, Mitsubishi, NIU, and smart
Needs: OVMS module + vehicle cable

AudioWagonAndroid app

Play your USB music through the car's media screen

80stars on GitHubActive. Last commit 3d ago.

Devices: Sierra with Google built-inAlso works with Google and car makers, Polestar, Volvo, Renault, Lincoln, Honda, and Nissan

Shadetree AIMCP server

Let an AI assistant read a local diagnostic scan

24stars on GitHubActive. Last commit 3w ago.

Devices: Early-2000s truck with J1850 VPWAlso works with Multiple manufacturers and Honda

NorrklangAndroid app

Play your self-hosted music in the car

23stars on GitHubActive. Last commit 2d ago.

Devices: Blazer EVAlso works with Google and car makers, Polestar, and Volvo

OnStar for Node-REDPlug-in

Build car automations with visual Node-RED flows

18stars on GitHubActive. Last commit 2d ago.

Needs: Node-RED
Data: General Motors's unofficial API. Signs in with your General Motors password the way General Motors's own app does, so it can stop working when General Motors changes it.Needs an OnStar Connect
Subscription: Needs an OnStar Connect

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What you can change

Available mods

Start with one of these

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What you can change

Available mods

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