1. Twist the tan and yellow wires so that there is at least one twist every two inches.
2. Carefully, remove the OBDII connector from the dash by depressing the tabs on the sides.
3. Remove the two grey pin retainers from the back of the connector.
4. One at a time, remove & replace the yellow and brown wires from locations 6 & 14. For a 2018 truck, replace the yellow with yellow and the brown with tan. For the 2019, 2020 and 2021s, replace the yellow with tan and the brown with yellow. NOTE: If you install the cable and can’t connect to the truck, try swapping the wires. We've heard that some trucks don't have tan and yellow wires in 6 and 14, but no matter the wire colors, the pins go in 6 and 14.
Note: A 1.5mm wide flat terminal release tool or a pointed sewing needle works for removing pins.
OBDII Connector
5. Reinstall the two grey pin retainers.
6. Locate the green “Star” connector above the parking brake. For 2018 plug the harness into any empty space, for 2019-2021 plug the harness into the fifth position from the left at the bottom.
2018 Star Connector
2019/2020/2021 Star connector
7. Cover & insulate the pins you removed from the OBDII connector.
8. Reinstall the OBDII connector into the factory location.
The bypass cable will also likely be needed in the following scenarios:
Huge THANK YOU to Kyle Ensley at X-Ploit Diesel Performance for letting us use his original instructions for the 2018 as well as to Jarid Vollmer at Breakout Tuning for their assistance in designing this cable.
Part Number: FT2018-2021BypassCummins
Fish Tuning is now on Instagram, Facebook and YouTube! Follow us and find out about the latest and greatest of what we are up to at Fish Tuning. To find pictures, videos, sneak peeks, etc.
