Cummins Bypass Cable Installation 2018+
2018/2019/2020 Cummins Bypass Cable Installation
Installation Steps
- Twist the tan and yellow wires so that there is at least one twist every two inches.
- Carefully remove the OBDII connector from the dash by depressing the tabs on the sides.
- Remove the two grey pin retainers from the back of the connector.
- 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 and 2020, 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.
- Note: A 1.5mm wide flat terminal release tool or a pointed sewing needle works for removing pins.
OBDII Connector
Locate the Star Connector
- Reinstall the two grey pin retainers.
- Locate the green “Star” connector above the parking brake.
- For 2018, plug the harness into any empty space. For 2019 and 2020, plug the harness into the fifth position from the left at the bottom.
2018 Star Connector
2019/2020 Star Connector
Final Steps
- Cover & insulate the pins you removed from the OBDII connector.
- Reinstall the OBDII connector into the factory location.
Important: The bypass cable will likely be needed for the following scenarios:
- Changing the tire size
- Adding an aftermarket remote start
- Using a Snap-on or other OBDII scanner
- Adding AMP Steps
