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DECODE DTCs
Convert J1939 diagnostic messages via software/API tools
50+ DM
The DBC contains 50+ DM messages split into signals
DEMO OFFER
Send us a CANedge log file for a free sample decoding
CROWD INPUT
Benefit from free corrections based on large user base
SAVE HOURS
Avoid manually constructing the DBC file from scratch
LEGAL LICENSE
Includes J1939-73 PDF + license (price: 167$)
What is a DBC file?
A DBC file is a standardized method for storing the "rules" on how to interpret raw CAN bus data. In particular, it contains details on what 'signals' (e.g. RPM, Vehicle Speed, …) are contained within which 'messages' (i.e. CAN IDs).
In the J1939 standard, messages are referred to as Parameter Group Numbers (PGN) and signals as Suspect Parameter Numbers (SPN).
Further, a DBC file includes names, descriptions, positions and lengths of the signals - as well as how to offset and scale them.
This DBC file download includes:
- A J1939-73 DBC file with details for DM1, DM2, ..., DM52
- The J1939-73 standard PDF
- One legal license (1 user, 1 PC) matching the J1939-73 license
When is the database useful?
The J1939 protocol is used across most heavy-duty vehicles, including commercial trucks, tractors, transit buses etc. Because the protocol is standardized, you can use our J1939 DBC file to decode data across the majority of heavy-duty vehicle brands/models.
The J1939-73 DBC file complements our J1939 DBC by adding decoding information on the J1939 diagnostic messages, also known as DM1, DM2 etc. These messages contain critical information on potential issues in a heavy-duty vehicle through warning lamp statuses and Diagnostic Trouble Codes (DTC). The latter contain information on which part of the vehicle has issues (through an SPN identifier) and e.g. what type of failure is present (though a failure mode identifier).
| GENERAL | |
|---|---|
| Standard(s) | J1939-73 (2022-08) - PDF is included in download |
| #Messages | 50+ |
| #SPNS | 2000+ |
| Multipacket | Multipacket syntax is used for the multipacket PGNs included in the DBC |
| Descriptions | Partial message/SPN descriptions included in DBC (full included in PDF) |
| Value tables | Some value tables are included |
| Network nodes | Not included |
| DTC methodology | DTCs are split into SPN, SPN_High, Failure Mode Identifier, Occurrence Count, Conversion Method |
| Version | The DBC only supports the 1996 February Version 4 encoding of DTCs (CM = 0) |
| 15+ DTCs for each relevant DM (actual number depends on number of active DTCs in vehicle) |
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