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Setup Guide
Difficulty: Moderate
Devices: comma 3 / 3X

StarPilot Installation Guide

How to install StarPilot on your comma 3 or comma 3X. One install URL works for all vehicles: .

StarPilot ChannelStarPilot WikiStarPilot Features Guide
Compatibility
GM vehicles only
Supported devices and vehicles
Install URL is the same across supported GM setups.

Comma Devices

  • comma 3X — fully supported, recommended
  • comma 3 (C3) — supported
  • comma 4 — not yet (interim: firestar5683/SunnyPedalUpdate)

Supported Vehicles

  • Chevrolet Bolt EV (2017–23, with LKAS)
  • Chevrolet Bolt EUV (no SuperCruise)
  • Chevrolet Volt (with ASCM/SDGM setup)
  • Other GM ASCM/SDGM cars (ask in Discord)
  • SuperCruise-equipped vehicles

Install Methods

Use the standard installer for normal setup. The second tab covers recovery and switching from another fork.

Step 1

Power off your car

Engine or EV system fully off. Plug your comma device into the windshield mount if it isn't already.

Step 2

Connect to WiFi

On first boot, the comma asks for a WiFi connection. If you don't have WiFi at your car, bring it inside and power it via USB-C near your router.

Step 3

Select Custom Software

Once connected to WiFi, the device shows a software prompt. Tap 'Custom Software' to enter a fork URL.

Step 4

Enter the install URL

Type and confirm. The StarPilot installer will load with three options.

Step 5

Choose Install (recommended for most)

Tap "Install" to install the main StarPilot branch. This is correct for almost everyone — Bolt, Volt, and other GM cars.

Step 6

Wait for download and install

StarPilot downloads and installs. Takes a few minutes. Don't interrupt power during this step.

Step 7

Complete setup and verify fingerprint

After install, go through the setup screens. Verify your vehicle fingerprint in Vehicle Controls — especially important for Bolt owners. Each Bolt model year has its own lateral tuning profile.

Step 8

Configure essential settings

Follow the Essential Settings: turn off Human Like Following and Acceleration. For radar-less / non-ACC Bolts, enable CEM with 'Slower Lead' and 'Stopped Lead' turned on. Set 'openpilot Wants to Stop In' to 8 seconds.

Available Branches

All branches use and are chosen inside the installer.

Stable / Main
Select "Install"

Recommended for daily use — Bolt, Volt, all GM cars.

Special Branch
Select "Choose a special branch"

Advanced users and testers only.

Deep Nuke Params
Select "Deep Nuke Params"

Recovery option — stuck on boot logo after switching from FrogPilot or old branch.

Bolt Owners
Fingerprint check required
Verify your Bolt fingerprint after install

Each Bolt model year has its own lateral tuning profile. The 2017 Bolt supports 4.5 Nm of steering torque — higher than other years. Auto fingerprint usually selects the correct profile, but if steering behavior looks wrong after install, manually verify your fingerprint in Vehicle Controls. Do not select the 2017 fingerprint on other model years.

22-23 Bolts: Sport mode decreases available steering torque — keep it in normal mode while using openpilot.

Bolt Hardware Setup

Hardware needed depends on whether your Bolt has factory ACC. Harnesses available from BearTechWorkshop (tinybear) — recommended source. Comma Power cable is not needed for GM vehicles.

Bolt EV / EUV — No ACC (Non-ACC)
  • comma 3X (recommended)
  • GM Harness + Harness Box (from BearTechWorkshop / tinybear)
  • Comma Pedal — strongly recommended

Without a pedal, openpilot uses 'Redneck ACC' (CC Long) to control speed — functional but limited. With a pedal: full throttle, regen braking (L mode), and stop-and-go support.

Bolt EV / EUV — With Factory ACC
  • comma 3X (recommended)
  • GM Harness + Harness Box
  • Comma Pedal — optional (adds stop-and-go and regen; tradeoff: loses friction brakes)

ACC Bolts allow openpilot to use friction brakes and have auto resume from stop via the ACC system. Adding a pedal switches to regen-only braking mode.

Volt Hardware Setup

Volt setup is more complex than Bolt — configuration depends on model year and whether your car has factory ACC. SASCM overrides the factory ACC and gives openpilot full longitudinal control.

2017-18 Chevy Volt — With Factory ACC
  • comma 3X
  • ASCM Harness Plus + Harness Box
  • SASCM (enables openpilot longitudinal control)
  • OBD-C Cable — 15 ft
  • Comma Pedal (optional — adds stop-and-go for 2018+)
2019 Chevy Volt — With Factory ACC
  • comma 3X
  • SDGM Harness + Harness Box
  • SASCM
  • OBD-C Cable — 10 ft
  • Comma Pedal (optional — adds stop-and-go)
Volt — Without Factory ACC
  • comma 3X
  • OBD-II Harness (or GM Harness if you have stock LKAS)
  • Firmware flash for ACC (recommended — contact pinballben in Discord)
  • or: Comma Pedal (untested on Volt, limited to L-mode regen)
Volt firmware flashing: For Volts without factory ACC, flashing the car's ECU to add ACC is the recommended path for the best experience. pinballben in the StarPilot Discord is the community expert — DM via the member list for instructions and hardware (fee required).

Troubleshooting and Community

Recovery steps, install help, and the main community links.

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