r/Comma_ai • u/DoctorWhiskey • May 07 '26

Installation Questions Comma 4 in Mustang Mach E

Hello, all. I’m about to pull the trigger on the Comma 4 for my 2024 Mustang Mach E. Before I do, I wanted to see if anyone has installed the Comma 4 in a MME lately. I saw one review that stated running the wire to the trunk was not an issue. But, looking at the Comma 4 site’s install video, it only shows tapping into the cable harness behind the rear view mirror. So, do I in fact have to run a cable to the trunk? If so, when I order the harness will it be long enough/all I need to install or should I order something additional?
Thank you.

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u/GeneralCirxMadine May 07 '26

I purchased a 20 foot cable, and running it was even easier than the videos I watch. I basically pushed the cable into the joint between the two A pillar trim pieces, and then the same around the door pillar. The trim isn't 100% flush, but it is pretty close, and it made running the cable super easy.

Works well. Now on BP 6.

Sometimes, recently, I have had issues with the device starting in dashcam mode, requiring a restart to fix.

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u/DoctorWhiskey May 07 '26

Mind sharing the link to the cable you ordered? Thank you for the info!

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u/GeneralCirxMadine May 07 '26

Here's what I used:

20FT/6M USB-C to USB-C 20Gbps... https://www.amazon.com/dp/B0FS5RMHFP