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Hello, thanks for your question.
"DTC´s" are supported parameters in our OBD trackers (FMX001, FMX002 and FMB003).
Please note that parameters availability may depends on your own vehicle.
Our devices can send: "Number of DTC" through AVL ID: 30 and the "Fault Codes" through "AVL ID: 281".
In the following link you can find supported AVL param ID's:
https://wiki.teltonika-gps.com/view/FMB003_Teltonika_Data_Sending_Parameters_ID#OBD_elements
Let us know if any doubt left.