BULLY DOG Triple Dog GT Diesel View larger

Bully Dog 40420 GT Platinum Diesel

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Bully Dog GT Platinum Diesel 


1999-2016 7.3L/6.0L/6.4L/6.7L Powerstroke | 2001-2016 6.6L Duramax | 2003-2016 5.9L/6.7L Cummins

2013-2016 Cummins tuning requires part# (42213)

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The Bully Dog GT 40420 is a downloader AND a monitor all in one compact electronic device!  Considering all the features contained within the GT it is amazing that installation is as easy as plugging the unit into the OBDII port and performing a simple download to the vehicles ECU. What's more convenient is that the Bully Dog GT 40420 works on almost all late model diesel pickups and even some commercial applications.

The Bully Dog GT 40420 features the all new patent pending Driving Coach feature. According to outside research studies, drivers can save up to 37% on their monthly fuel bill simply by adopting better driving habits. The Driving Coach feature shows people specifically where their current losses are coming from so they can make adjustments to correct their inefficiencies. In doing so, the Coach provides audio and visual feedback to instruct a driver on how to learn better driving habits. Read more about the driving coach feature below.





The Driving Coach is a special feature designed to help drivers drive more efficiently. It coaches drivers into better driving habits by providing real time visual and audio feedback as to how efficient a driver is driving. The driving coach also provides the driver with a "grade," on how efficiently they drove during a particular trip. This makes driving efficiently, constructive, and fun! Drivers can use the Driving Coach to coach themselves into improved driving habits. Every driver can challenge themselves to be "The perfect driver."
Bully Dog GT 40420 Features:
  • Added horsepower and torque
  • Improved fuel economy
  • Safety Defueling
  • On-the-fly power level adjustment
  • Four different power levels to choose from
  • Easy installation (20-40 minutes)
  • Free internet updates and upgrades
  • Monitor and display vehicle parameters (PIDs)
  • Full Color display with multiple color themes
  • User set daytime and night time driving modes
  • Display current gear on vehicles with auto trans.
  • Vehicle specific download features
  • Initiate DPF burnoff on ‘09 GM and Dodge diesel
  • Defuel based on user set safety parameters
  • Read and Erase Diagnostic Trouble Codes
  • Display instant fuel economy and trip fuel economy
  • Exclusive Driving Coach feature, Patent Pending
  • Universal Suction Cup Mount included
  • Holds up to 10 custom tunes (not included)

Performance Gauge Functions:

  • Real Time Fuel economy
  • Average Fuel economy
  • Trip Fuel economy
  • Load %
  • Coolant temperature
  • Fuel rail pressure (diesel vehicles)
  • Manifold absolute pressure
  • Engine RPM
  • Speed
  • Timing position
  • Air intake temperature
  • Mass Air Flow (grams/sec.)
  • Throttle position
  • Fuel level
  • Battery voltage
  • Ambient air temperature
  • Transmission temperature
  • Pyrometer #1 & 2 optional (diesel vehicles)
  • Boost (diesel vehicles)
  • IPW: injection pulse Width (diesel vehicles)
  • Barometer (diesel vehicles)
  • Oil temperature (diesel vehicles)
  • ICP: injection control pressure (diesel vehicles)

NOTE: 40384 Sensor Station with Pyrometer Probe is required to read EGT's on all non-DPF equipped pre-2007.5-2008 models. (sold separately)
Applications Include: 
  • 1999-2015 F-Series 250-550 7.3L/6.0L/6.4L/6.7L Powerstroke (Excludes 2013+ Cab & Chassis & Manual Xfer Case)
  • 1999-2005 Ford Excursion 7.3L/6.0L Powerstroke
  • 2003-2015 Dodge Ram 2500-5500 5.9L/6.7L Cummins  (2013-2015 models require 42214 Unlock Cable)*
  • 2001-2015 GM 2500/3500HD 6.6L Duramax
  • 2006-2010 GM Kodiak/Topkick 4500/5500 6.6L Duramax
  • 2006-2014 GM Savannah/Express 2500/3500 6.6L Duramax

Bully Dog GT application chart/ vehicle info sheet


2013-2014 GT Unlock Cable

Previous to the release of this simple to use cable, you were required to remove your PCM from the truck and send it in for modification in order to allow you to tune your Cummins, obviously leading to down time for your truck.  This simple cable allows you to use a Bully Dog GT (PN:  40420) to tune your, and any other 2013-2014 Cummins that also has a GT Tuner.  This is a one time use cable, thus once you've originally installed the tuner using the cable, your truck is now permanently unlocked, even if you are to return it to stock, so you can tune your buddy's truck or anyone else's (as long as they have their own GT Tuner).


  • Purchase a GT Diesel Tuner and the Cummins Unlock Cable
  • Install the GT Diesel Tuner and follow on-screen instructions
  • Install the Unlock Cable and follow on-screen instructions on the GT
  • Install Tuning from the GT Tuner


Your Bully Dog Triple Dog GT is a powerful tuner and monitor as well. Its gauge function lets you view over 20 parameters and functions. If you're riding on oversized tires, the included speedometer calibrator compensates for your tire size for proper readouts. The Triple Dog GT has multiple power tune options, including tunes custom-programmed for your vehicle. You can read and erase DTCs, engage speed and rev limiters, DPF burn-off and safety defueling, and tune your transmission.