Before you start!
Make sure you have the correct Can Bus plugs for your trucks year. We HIGHLY, extra emphasis on HIGHLY, recommend getting your plugs from a trusted manufacturer. Yes there are some available for cheaper on sites like Amazon or eBay, but you really do get what you pay for. Our recommendation for your 17-19 Duramax is the FISH Tuning Can Bus plugs available here. These are the plugs we use for our customers and in the photos below.
Plug 1
Located in the top right of the engine bay
Plug 2 (Large Plug)
Located inside the frame on the front passenger side
Plug 3
Located outside of the frame on the passengers side
Plug 4
Located inside the frame behind the read passenger wheel
1 comment
Saved me so much time with this. Thanks for actually posting clear instructions.