Match the equipment
Year and model alone are not enough. Your car needs the listed package or driver-assist option.
Will comma work with my GMC?
One GMC model is listed. Find yours, then check the years and the required package.
1model listed
1exact year and package combinations
0where openpilot controls gas and brakes
1where the car’s cruise control keeps speed
Choose your exact match
Listed GMC models and years
Tap your model, then pick the years. Check the package too, even when the year matches.
Sierra 15002020–2021
Counts describe this list, not every GMC ever made. Checked 2026-09-02.
Before you buy
Three things to check first
Read the driving limits
Each car page shows steering, gas and brake control, and minimum speeds.
Confirm the harness
The car page lists the connector. Check comma's current list before ordering.
Quick answers
Common GMC questions
Does comma work with every GMC?
No. This page covers the 1 configurations comma lists. Other models, years, or packages are not included.
My GMC year is missing. Can I use the closest one?
No. A nearby year is not confirmation. Check comma's current list for your exact year before buying.
Does this make my car self-driving?
No. openpilot is driver assistance. You watch the road and stay ready to take over at any moment.
Next steps
Sources
Car listings checked 2026-09-02. This guide does not extend support beyond those exact configurations.
The GMC mark identifies the make and belongs to its owner. CommaGuide is an independent guide.