CAN Plug InformationUpdated 3 months ago

The L5P CAN plugs are used to keep the CAN network functional after removing the emissions equipment.  These CAN plugs use very thin terminals to match the factory harness and require extreme care to be taken when installing them. 

Any time the CAN plugs are installed or removed, the batteries must be disconnected to avoid CAN communication codes. 

We recommend ensuring the contacts on the truck's connectors are completely clean, using Electrical Contact Cleaner is advised as is using Dielectric Grease when installing them.  

Once you have your SOTF tune flashed on, you can save some potential headaches by first installing the CAN plugs and then reconnecting the batteries and scanning for codes, this way if there are issues with the connection, you will still have your emissions installed to clear the codes.

The black 6-pin plugs are used to replace the NOx modules that are removed with the sensors when removing the factory exhaust, the 2017-2019 models will use 3 NOx plugs, and the 2020+ will use two. 

The larger 16-pin (2017-2019) or 30-pin (2020+) CAN plugs replace the DEF connector.  Their only purpose is to keep the CAN line connected with the factory modules removed and can be substituted with the factory modules for testing, the DEF connector can be left plugged in without issue, and the NOx modules can be left plugged in but the sensors will likely fail after some time. 

You will spot the NOx modules as you are removing the exhaust, otherwise follow the sensors from the exhaust to the module which will look like this:

You will install the NOx CAN plug on the harness that was plugged into the connector seen on the left side of the module pictured above. One of these modules will be located in the engine bay, near the driver-side corner of the firewall as seen below:

^2017-2019^

^2020+^

The remaining modules are located underneath the truck, the DEF connector will be found on the passenger side frame rail on the 2017-2019 models and the driver side frame rail on the 2020+:^2017-2019^

^2020+^