1. Included with Purchase
2. Step by Step Instructions
3. How The Selector Switch Works
4. Check Engine Light Troubleshooting
5. Remove Module Before Service
2001-2004 6.6L Duramax LB7 Installation
Index
Step by Step Instructions
Be sure your truck has been off, with the hood unlatched and key fob located away from the vehicle for at least 15 minutes before installing the module. Key fob needs to continue to stay away from the vehicle for the entire installation process. This allows the computer to 'sleep' and for your engine compartment to cool down. It also helps mitigate your ECM from detecting an interruption in a sensors electrical circuit.
Step 1
Locate the fuel pressure sensor on the fuel rail. It’s found below the boost tube pipe near the center of the engine. Removing large plastic intake resonator can make it easier gaining access.
Step 2
Disconnect the fuel pressure sensor from the factory plug. Install the female fuel pressure plug to the truck’s fuel pressure sensor. Plug in the male connector to the engine’s female connector.
Step 3
Install the 4-position switch on the module’s harness. It can be mounted inside the cab for easy access or most often, left under the hood near the module.
Step 4
Ensure all connections are tight - all plugs should be snap closed when installed properly. Gently tug on all connections to make sure they are secure especially the fuel pressure plug.
The module and switch must be installed away from heat and moving parts.
How The Selector Switch Works
The dial going clockwise:
Stock - Low - Medium - High
Low: Towing heavy and low traction situations.
Medium: Moderate towing and ideal for everyday driving situations.
High: Maximum performance - ideal for empty highway cruising.
The switch must remain plugged in to stay in the desired setting. You can run the switch into the cab or leave it tied up under the hood. Leave in one setting as much as possible.
Everyone has different driving preferences, it’s suggested that you try each setting for at least a week to see what you prefer.
If You Get a Check Engine Light or Hard Start Upon Installation
Please check the connection between the truck’s wire harness and the module’s female plug and ensure it was connected properly. Improper installation will cause a CEL/hard starting.
Remove The Module Before Service Work
If you need to take your vehicle in for service work, REMOVE the module before work is performed.
If you have any issues, please call (800) 406-5257 and one of our techs will be happy to help you!