car harness

car harness

Connect to your car


Development Vehicle
Hyundai A Development
Hyundai B Development
Hyundai C Development
Hyundai D Development
Hyundai E Development
Hyundai F Development
Hyundai G Development
Hyundai H Development
Hyundai I Development
Hyundai J Development
Hyundai K Development
Hyundai L Development
Hyundai M Development
Hyundai N Development
Hyundai O Development
Mazda Development
MQB Development
Nissan A Development
Nissan B Development
OBD-II Harness (For GM)
VW J533 Development


The car harness is our universal interface to your car. Use the car harness to connect your comma device to your vehicle. We designed it to be almost invisible in your car while being easy to install and use. Car harness includes comma power v2 with ECU fingerprinting capabilities, a harness adapter with automatic switching to stock, 1 RJ45 cable (7 feet), and 1 USB-C to USB-C cable (1.5 feet).

If you are using the car harness with an EON, you must also purchase the black panda with high precision GPS and OBD-C (the new standard port for comma hardware).


  • Stealth install; car parts remain in place, no messy cables
  • Easy to set up; watch us do it in 3 minutes here
  • Advanced relay technology ends cruise fault & warning lights

What's in the box?

  • 1 harness box
  • 1 harness connector
  • 1 comma power v2
  • 1 RJ45 cable (7 ft)
  • 1 USB-C to USB-C cable (1.5 ft)

Developer Notes

  • No switches!
  • Auto shutoff to protect your car battery
  • Easier to develop new car ports
  • OBD-C is the new standard port for comma hardware
  • For harness without connectors, choose "Development vehicle"

Harness compatibility based on the US car market.

Free US shipping, $30 flat rate internationally.

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