Installation Instructions for Chevy/GMC Duramax LML 6.6L Stealth Module (2011-2016)

Included With Purchase

(1x) Stealth Module
(1x) Wire Harness with Fuel Pressure Connections and MAP Connections
(1x) Selector Switch

 

Video Installation

 

BEFORE INSTALLING:

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 fuel pressure and MAP sensor connections above.

STEP 2

Pull back gray locking tab on the MAP sensor, depress the black clip and disconnect the factory plug. Referenced above.

STEP 3


Plug the module's MAP connection into the MAP sensor and factory harness. Tug the connector to ensure it's properly connected.

STEP 4

Disconnect the fuel pressure connection located on the driver side valve cover all the way in the back.

STEP 5

Plug the module’s longer clip (male connector) into truck’s fuel sensor that you just unclipped (female connector). Next, plug the module’s shorter clip (female connector) into the truck’s fuel rail (male connector).

STEP 6


Tug on all connectors to ensure they are properly secured.

Turn Dial Clockwise

Stock - Low - Medium - High


Low - Low traction.
This setting has the least performance gain

Medium - Normal driving.
This setting has mid level performance gains

High - Fastest acceleration and max torque.
This setting is great for open highway cruising, high demand, and burning rubber

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 and do not switch power levels while pressing the accelerator.

Everyone has different driving preferences. It's suggested that you try each setting for at least a week to see what you prefer.

Check Engine Light or Hard start on Install?

The most common reason for a check engine light on install is due to the truck not being asleep. If the Stealth Module has already been removed, please start the installation process over while giving special attention to the instructions above step 1. If the Stealth Module is still installed, verify connections and disconnect the negative terminals on your battery for a hard reset. Events that will wake the truck up: Not letting it sit for 15 minutes, opening/closing the vehicle door, having the key near the truck during install.

The most common reason for a hard start on install is due to improver connection. Please verify that all connections are straight and pushed in all the way. Be sure the harness is pushed in tight to the Stealth Module as well.

If you are still having trouble, please give our 24/7 tech support a call at (888) 613-4304

Remove the Stealth Module Before Service

Before going in for service, please remove the Stealth Module so that the truck is back to stock. This allows the technician to have a fresh base line when performing any work.