@Thiago, welcome to ColdBox and welcome to the list!
Let’s start by figuring out where your cfc is that you wish to inject and how are you making WireBox (which is in charge of injecting it) aware of it’s location?
Also, if you drop your minimum logging level (in config/coldbox.cfc) for the coldbox.system category down to “debug” you should get some info in the logs from WireBox that might help us figure out why it’s not injecting your dependency.
Additionally, can you show us the cfproperty tag you are using in your plugin so we can confirm the syntax is correct?
And lastly, can you show us the code you are using to create your plugin?