J1979 DBC

The SAE J1979 DBC file contains decoding rules for converting raw J1979 data to 'physical values' (MPH, %, etc.). This file lets you easily decode data from passenger vehicles and heavy-duty vehicles that employ the J1979_2 protocol.

This DBC file download includes:

The SAE J1979 DBC file includes 250+ single-frame PIDs and 2250+ Signals defined in the J1979 DA released in October 2025.

One legal license (1 user, 1 PC) matching the DA license, based on an annual subscription. 
DECODE J1979: Convert J1979 data in wide range of software/API tools
REVIEW FIRST: Use our CAN ID converter to check if your PIDs are covered
CROWD INPUT: Benefit from free corrections based on large user base
SAVE HOURS: Avoid manually constructing the DBC file from scratch for improved Accuracy & Reliability.

The file will be kept up-to-date as new J1979DA additions are approved.

A standardized DBC file ensures accurate signal decoding, eliminating errors and ensuring reliable data interpretation.

 Partnership with DG Technologies

Developed by DG Technologies, this dbc is seamlessly compatible with many different software stacks, enabling frictionless adoption and significantly expanding market reach.

 What is a DBC file?

A DBC file is a standardized method for storing the "rules" on how to interpret raw CAN bus data. It contains the details needed to fully decode the signals, including names, descriptions, positions, lengths, offset and scaling are included in the DBC.