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Install the Truck Edition Module on Your 6.6L GM Duramax Engine

When you drive a big, bad truck that's stocked with an LML Duramax diesel engine, a funny thing happens. All that power grabs ahold of you, leaving you longing for more, more, more. Around the shop at Area Diesel, our crew has a term for drivers who have become consumed by that need. We call them the power hungry. We consider it a gift, not a curse. Of course, the fact that we carry the fix they need might color our perception on the matter.

What's the secret to maxing out the power in your Duramax? The Truck Edition Module. Keep reading for some useful background info or skip straight to the installation instructions.

This LML Duramax Engine is ready for installation of the Truck Edition Module.

The Truck Edition Module is proven to improve performance on nearly any diesel engine—including the LML Duramax. First introduced in ’01 3/4-ton and 1-ton GMs, the Duramax engine (LB7 at the time) is the innovative result of a collaboration between engineers at General Motors and Isuzu. As of 2011, the LML is factory shipped with a high-pressure common rail and direct-injection fuel system that deliver an extraordinary 397 hp and 765 lb-ft of torque at 1,600 rpm. That makes the Chevy Silverado HD and GMC Sierra HD a couple of burly SOBs.

Just like you, though, our diesel specialists say all that power still isn't good enough. So we use the 21200 and 21500 Truck Edition Modules for 2011 – 2014 and 2015 LML Duramax engines, respectively. Installing a Truck Edition performance module can unleash your truck's full potential, increasing power by up to 90 hp while improving fuel efficiency by 3 to 4 mpg—all without bypassing important emission control devices.

As you'll see in the instructions below, the module is a breeze to install and takes only minutes.

Truck Edition Module Kit Contents

First, let's make sure you've got everything from the Truck Edition Module kit ready to go:

  • The Module Itself
  • Adjustable Switch Connector
  • Male Fuel Pressure Connector
  • Female Fuel Pressure Connector
  • Female MAP Sensor Connector
  • Male MAP Sensor Connector 
  • Zip Ties

Have these two tools handy, too:

  • Flathead Screwdriver
  • Drill with 1/4" Bit

Module Installation

Let's get started:

  1. On the driver's side of the engine, locate and disconnect the fuel pressure sensor connector—mounted to the valve cover near the firewall.
    Find the fuel pressure sensor connector for the Truck Edition Module installation.
  2. On the module, locate the fuel pressure plugs—closest to the case on the new harness. Then, connect both sets of plugs, ensuring the connectors snap into place:
    • Insert the stock Duramax male connector into the female connector of the module.
    • Insert the male connector of the module into the stock Duramax female connector.
      While installing the Truck Edition Module, find the fuel pressure plugs.
  3. Just to the driver's side of the air box, locate and disconnect the stock Duramax MAP Sensor.
    For installing the Truck Edition Module, disconnect the MAP sensor.The Truck Edition Module requires the MAP sensor to be disconnected.
  4. At the end of the module harness, furthest from the case, grab the MAP sensor plugs. Then, connect both sets of plugs:
    • Insert the stock MAP sensor male connector into the MAP sensor female connector on the module.
    • Insert the MAP sensor male connector on the module into the stock MAP sensor female connector.
  5. Select your preferred location for the module switch—controlled from inside the cab. Then drill 1/4" holes in both the dashboard and the corresponding spot in the engine firewall.
  6. From inside the cab, route the connector end of the switch cord through the dashboard and firewall, leaving the black switch mounted securely to the dash.
    Control your Truck Edition Module from the cab.
  7. Back under the hood, finish routing the switch cord to the module box and insert the male plug of the switch connector into the female plug.
    Connect the Truck Edition Module switch.
  8. Select your preferred location and mount the module box, using the zip ties to secure the wires and module away from any extreme heat and moving parts.
    Mount the Truck Edition Module safely.

That's that. Shut the hood and you're all set.

Fully Controlled Power

The Truck Edition Module is built with four power levels and designed to leave you in complete control: Stock, Low, Med, and High.

You can adjust the power levels on the fly. For stock-level power, turn the switch counterclockwise as far as she'll go. To increase power, turn the switch clockwise as needed to Low, Medium, and High.

Table 1 Power Levels

Switch Position Power Level Horsepower Increase
1 (Completely Counterclockwise)  Stock (STK) 0
2 Low Up to 30 hp
3 Medium Up to 60 hp
4 (Completely Clockwise) High Up to 90 hp

If you've got any questions or need tech support, Area Diesel is here to help. Just fire off an email or give us a call: (855) 343.7680 or (812) 618.9166