Is the V2 ODB2 cable an active or passive device?

[FeetDry]

I've seen comments about not leaving the ODB2 cable plugged in, but these seem to be related to older non-V2 devices.
I'm wondering if just the V2 -> ODB2 cable (without the V2 connected) will drain the battery.

[Happy Jim]

Nope, the cable is just a cable. Once you plug the V2 onto the end of it, it will drain the batt.

Rgds

Jim

[joecar]

If you leave the cable plugged in by itself, just be sure nothing shorts the RJ end of it.