alt Hacker NewsMaybe it's just the Uconnect infotainment system. The PDF I linked above is the in-depth Jeep hack run-down, and a huge huge huge part of it is playing around with the many many many many DBus services.
Is QNX just a kernel, no userland for it? I would have assumed it might include higher level offerings, including I would guess, to be helpful, some cross-system messaging options. Until now it's been impossible to guess. But yeah, it's quite likely this DBus stuff is just Dodge's repurposing of (not fantastic but reasonably ok and well known) messaging tech, DBus, layered atop.
QNX does provide a DBus implementation (based on the Linux one, so not a full reimplementation or anything) as part of the larger userland package, but it's in no way a core component of QNX itself and as far as I remember not used by any of the other services it ships with, so its purely there in case someone wants to use it for their application, e.g. because they also have a Linux version and don't want to use QNX-specific APIs if they can avoid it.
So yes, that was just a choice of whoever made the Jeep infotainment system.