Unsupported GM Support
Enables openpilot on GM Global A vehicles with LKAS but no ACC that stock openpilot ignores.
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GuideOPGM
OPGM is an openpilot fork built specifically for GM owners whose cars are not supported by stock openpilot. It targets GM Global A vehicles that have LKAS but no ACC, while keeping a minimal, clean-code approach that avoids touching non-GM code.
Hardware Compatibility
OPGM currently supports comma 3 and comma 3X. comma 4 support is not confirmed.
| Device | Supported |
|---|---|
| comma 3 | Yes |
| comma 3X | Yes |
| comma 4 | Not confirmed |
Install URLs
Use the installer URL that matches your desired update channel.
| Channel | URL |
|---|---|
| Stable release | installer.comma.ai/opgm/release |
| Nightly | installer.comma.ai/opgm/nightly |
Features
OPGM focuses on targeted GM functionality while staying close to upstream openpilot.
Pedal Long
Adds full longitudinal control via pedal interceptor and enables full regenerative braking on Bolt EV and Bolt EUV.
CC Long (Redneck ACC)
Uses stock cruise control buttons as adaptive cruise control. Cannot go below approximately 24 mph.
Stop-and-Go
Adds stop-and-go support for upstream-supported GM cars.
Lower Min Speed
Reduces the minimum engagement speed for supported vehicles.
Clean Codebase
Non-GM code is never modified, keeping changes surgical and targeted.
Minimal Philosophy
Stays as close to stock openpilot as possible while adding GM-specific support.
Official Links
Safety Disclaimer
OPGM is an unofficial openpilot fork and is not affiliated with or endorsed by comma.ai. You are responsible for your vehicle at all times. Stay fully attentive with hands on the wheel and be ready to take over immediately.