The controller that the diagnostic belongs to. Controllers could be ABS controller, suspension controller etc. The available controllers are listed in the KnownId.
Properties
Code
The controller diagnostic code (if applicable).
CodeId
The message identification code for the controller of the diagnostic (if applicable).
Id
The unique identifier for the specific Entity object in the Geotab system. See Id.
Name
The name of this entity which identifies it and is used when displaying this entity.