Installation Instructions for Chevy/GMC Duramax L5P 6.6L Stealth Module - 2500/3500 (2024-2025)

Included With Purchase

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

 

Video Installation

 


Step by Step Instructions

It is important to put your truck to sleep so it is not aware you're unplugging sensors. To do this you must open your hood all the way up and wait a few minutes until your dash lights shut off and your vehicle is not making any sounds. Leave your key fob away from the vehicle and do not open the doors or disturb the truck in a way that will cause it to wake up for the duration of the install. If you this step is not done properly you will need to clear the codes with a code reader or disconnect the negative terminals on both batteries for 30 seconds.

 Step 1:

Please disconnect the negative battery terminals on both batteries during install.

 Step 2:

Locate the sensor connections shown below.

Sensor Connections


Step 3:

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

Sensor Connections


 Step 4:

Connect the module wire harness connectors to the factory connectors. Push in both red tabs to lock both connectors. Tug each connector gently to ensure they are properly latched.

Sensor Connections


Step 5:

Locate the fuel rail pressure sensor, to the right side of the MAP sensor. Pull back the red locking tab, depress the black locking tab to unplug the sensor connection.

Sensor Connections


 Step 6:

Plug the module connectors into the factory connectors. Push in red locking tab, gently tug on each connection to ensure they are securely connected.

Sensor Connections

 

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.