Multi-channel diagnosis method and device and vehicle

The embodiment of the invention discloses a multi-channel diagnosis method and device and a vehicle. The method comprises the following steps: in response to a received diagnosis message, obtaining a channel source of the diagnosis message; if the channel source is not the DCAN channel, determining whether the channel source is a TCAN channel; if the channel source is the TCAN channel and the diagnosis task from the DCAN channel is not being executed at present, obtaining the content of the diagnosis message so as to execute the diagnosis task corresponding to the diagnosis message; if the channel source is not the TCAN channel, determining whether the channel source is a PCAN channel; and if the channel source is the PCAN channel and the diagnosis task from the DCAN channel is not being executed at present, obtaining the content of the diagnosis message so as to execute the diagnosis task corresponding to the diagnosis message. Through the above mode, the priority of the diagnosis task executed by the DCAN c