OBD2 to 9 Pin J1939 Y Cable for Heavy Duty Trucks
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Allows our Performance Modules to be connected to a 9-pin (J1939) Heavy Duty Truck Diagnostic Port. Approximately 12 inches long.
Diagnostic ports are generally located below the steering wheel on the left side. This adapter allows you to connect your 16 pin OBD2 device or cable to a 9-pin Deutsch diagnostics connector found on medium and heavy-duty trucks and equipment. Compatible with both Type 1 (black) and Type 2 (green) 9-pin J1939 ports.
Vehicle Diagnostic Port Guide
| Make/Type | Year | Engine | Diagnostic Port |
| Freightliner | 2005 & older | All | 6-pin |
| 2006–2015 | All | 9-pin | |
| 2015 & newer* | All | 9-pin Type II (green) | |
| Kenworth | 2005 & older | All | 6-pin |
| 2005–2015 | All | 9-pin | |
| 2015 & newer* | All | 9-pin Type II (green) | |
| Peterbilt | 2005 & older | All | 6-pin |
| 2006–2015 | All | 9-pin | |
| 2015 & newer** | All | 9-pin Type II (green) | |
| International | 2006 & older | Cummins | 6-pin |
| 2006–2015 | Cummins | 9-pin | |
| 2005 & older | CAT | 6-pin | |
| 2005–2014 | CAT | 9-pin | |
| 2015 & newer* | All | 9-pin Type II (green) | |
| Volvo | 2000 & older | Volvo | 6-pin |
| 2001–2014 | Volvo | 9-pin | |
| 2014 & newer | Volvo | OBDII Plug (16-pin) | |
| 2006–2016 | Cummins | 9-pin | |
| 2016 & newer* | Cummins | 9-pin Type II (green) | |
| Mack | 2000 & older | Volvo | 6-pin |
| 2001–2014 | Volvo | 9-pin | |
| 2014 & newer | Volvo | OBDII Plug (16-pin) | |
| Western Star | 2006–2016 | Cummins | 9-pin |
| 2016 & newer* | Cummins | 9-pin Type II (green) | |
| 2010–2015 | All | 9-pin | |
| 2015 & newer* | All | 9-pin | |
| Light/Medium Duty Vehicle | 2008 & newer | All Diesel and Gas | OBDII Plug (16-pin) |
*Ensure that the diagnostics port on your truck does have a 9-pin connection
**Peterbilt and International trucks manufactured from 2017-2018 will require a special 9-pin cable
Provides power, ground, CAN/J1939 and J1708/J1587 data found on factory 9 Pin connector
Common Questions
What does this OBD2 to 9-Pin J1939 Y cable do?
It adapts a factory 9-pin J1939 Deutsch heavy-duty truck diagnostic port to a standard 16-pin OBD2 connection, providing power, ground, CAN/J1939, and J1708/J1587 data for performance modules and OBD2 devices.
How long is this adapter cable?
The cable is approximately 12 inches long.
Where is the 9-pin diagnostic port located on my truck?
On most medium and heavy-duty trucks, the 9-pin diagnostic port is located in the cab below the steering wheel on the left side.
Will this fit a truck with a 6-pin diagnostic port or a 16-pin OBD2 port?
This adapter is built specifically for trucks equipped with a 9-pin J1939 diagnostic port. Trucks that already have a 16-pin OBDII plug (such as 2014 and newer Volvo-engine Volvo and Mack trucks) connect directly to 16-pin OBD2 devices without this adapter.
Does this work on 2017-2018 Peterbilt and International trucks?
Per the diagnostic port guide, Peterbilt and International trucks manufactured from 2017 to 2018 require a special 9-pin cable configuration.
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