Who this is for
Anyone with a comma device that is out of warranty or behaving strangely.
comma fourcomma 3Xcomma threecomma two
openpilot hardware user group (ophwug)Fix a problemSome effort
comma hardware fixes from the community
Search the case list for your symptom; each case gives the likely cause and what other owners did.
You need
- Your symptom in plain words
- A browser; the page is over fifty printed pages
- Basic tools if a case calls for opening the device
In plain words
Why this guide matters
When a comma device stops booting, loses its screen or its fan dies, the fix is often a known part failure. The ophwug case book collects those fixes from Discord in one searchable page for comma two, three, 3X and four. You get a likely cause and what other owners did, so you can repair or decide to replace.
The short version
What the full guide walks you through
Open the table of contents and find your device family.
Read the case that matches your symptom.
Try the listed fixes in order, cheapest first.
Report back on GitHub or Discord if it worked.
Before you start
- Unofficial and not endorsed by comma.
- Some fixes open the device and void your warranty.
- Some product links are affiliate links.
The full project page belongs to openpilot hardware user group (ophwug). Checked on September 10, 2026. Their last update was September 8, 2026.
Quick answers
Questions people ask
Is this an official comma page?
No; it is written by volunteers and comma does not endorse it. It is free to read under a CC-BY licence.
Which problems does it cover?
Bad cables, blown fuses, dying screens, fans, GPS, stuck registration, flashing trouble and the comma two Wi-Fi problem, among others.
Will a fix void my warranty?
Opening the device can. If your comma four or 3X is still under warranty, use comma support first.
Related
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Check your exact car first, then choose software and hardware.
Photos: comma.ai. Guide content belongs to openpilot hardware user group (ophwug). CommaGuide is an independent guide and is not affiliated with comma.ai or openpilot hardware user group (ophwug).
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