We are using an OBD device (https://freematics.com/products/freematics-one-plus/) for some research work. We tested on several cars like Honda 2006, Subaru 2018, VW Golf 2013, Mercedes GLK 2017, etc. and it works fine.
Recently we had problems with 2 different Honda models - 2015 Accord and 2016 Civic.
The device is not able to connect to either of these. We see a booting event, but the OBD does not initialize.
Moreover, on the Accord, plugging in the adapter causes the Forward Collision Warning and Lane Departure Warning systems to fail -- it sets off the systems failed warning lights. (I can send photos).
We connected other adapters like Torque and another cheap Bluetooth one and they both worked fine.
Any ideas what could be happening? The OBD port (CAN bus) is set to auto detect the protocol which I think on the Honda is the 500kbps CAN.