OPGM

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.

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Target use case

GM Global A

Focused on LKAS-without-ACC vehicles that stock openpilot does not support.

Supported hardware

comma 3 / 3X

The current page lists comma 3 and 3X as supported, with comma 4 unconfirmed.

Install channels

Release + Nightly

Stable and nightly installers are both published under the OPGM org path.

Features

OPGM focuses on targeted GM functionality while staying close to upstream openpilot.

Unsupported GM Support

Enables openpilot on GM Global A vehicles with LKAS but no ACC that stock openpilot ignores.

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.

External Links

GitHub ↗OPGM Discord Channel ↗