The best technical support and full Performance Chip installation instructions. Lowest price 2500 Performance Chip guarantee and expert service. Ram 2500, 2012 Performance Chip by Bully Dog are available from For expert service call 800-298-8924 to order your Bully Dog Triple Dog GT Gauge Tuner - Color Screen - Diesel - Dodge part number BY40420D, or order online at
Select Your Vehicle

View Cart

Performance Chip Tuners > 2012 > Ram > 2500

Bully Dog Performance Chip for the 2012 2500 by Ram

Bully Dog Performance Chip

(6 reviews)

Code:   BY40420D



Shipping Special

Shipping Weight: 2 pounds


Bully Dog Triple Dog GT Gauge Tuner - Color Screen - Diesel - Dodge - 2012 2500 by Ram

Boost the power output of your diesel engine with this tuner, monitor and diagnostic device in one. Choose from 4 different levels to get gains of up to 130 hp and 260 ft-lb of torque. Unique Driving Coach program helps you maximize fuel economy.


  • Lets you choose from 4 power levels - on the fly - to boost horsepower and torque
    • Stock - factory default settings
    • Tow - gains up to 50 hp and 100 ft-lb of torque
    • Performance - gains up to 75 hp and 150 ft-lb of torque
    • Extreme - gains up to 130 hp and 260 ft-lb of torque
  • Displays vital engine data - shows up to 4 parameters at a time, with more than 15 to choose from
    • 2.4", Full-color LCD screen is flanked by touch-sensitive buttons
  • Maximizes fuel economy with Driving Coach program
    • Helps you to analyze driving habits and track effects of aftermarket accessories
  • Alerts you to changes and problems in engine function and performance
    • Set audible and visual alerts for engine protection
      • Monitor engine coolant temperature and transmission temperature
      • Use aftermarket pyrometer kit (sold separately) to monitor EGT
    • Run diagnostic checks and clear trouble codes
  • Can be transferred between different cars and trucks with diesel engines
    • Use it in your towing rig while taking your car to the track, then transfer it to your car to race
  • Records, displays and saves 1/4-mile performance testing times
    • Download free programs to compare runs and to further analyze data
  • Installs quickly and easily
    • Connects to Ram 2500's computer via the OBD-II port for real-time monitoring of vital engine data
    • Guides you through initial setup process with Setup Wizard
  • Includes universal suction-cup mount
    • Custom mounts (sold separately) available for certain applications for a from-the-factory look


  • Application: diesel engines
  • Monitor dimensions: 2-1/4" tall x 3-1/2" wide x 3/4" deep
  • 1-Year warranty

Note: This performance module is not legal for sale or use on pollution-controlled vehicles in the state of California.

Easily tune your diesel engine on the fly and monitor vital data with the Triple Dog Gauge Tuner. The full-color, customizable screen lets you monitor up to four different parameters at once. In addition to these parameters, the screen also features a large display that can be customized to show one of three different gauge styles (analog, analog with mini-graph, or full graph) or the Driving Coach display.

Engine Tuning

Get more horsepower and torque with the press of a button. On-the-fly adjustment means that you can go from OEM settings to extreme power in a moment's time. Choose from four different power levels to fit your driving needs.

Power LevelGainsApplication
StockNoneMaintains factory default settings
TowUp to 50 hp
Up to 100 ft-lb
Boosts power
Great for everyday towing
PerformanceUp to 75 hp
Up to 150 ft-lb
Dramatically increases power
Best for heavy-duty towing and driving through hilly terrain
ExtremeUp to 130 hp
Up to 260 ft-lb
Maximizes power
Intended mainly for racing

Monitoring Your Engine

The GT tuner lets you monitor more than fifteen different parameters so that you can be aware of the function and performance of your Ram 2500 at all times. Set parameters quickly and easily through the Gauge Setup Menu. Note: Not all of the following are available for all applications.

  • Real-time fuel economy
  • Average fuel economy
  • Trip fuel economy
  • Exhaust gas temperature (EGT)
  • Coolant temperature
  • Fuel pressure
  • Manifold absolute pressure
  • Engine RPM
  • Speed (mph or kph)
  • Timing position
  • Intake temperature - at point where OEM sensor is installed within air intake stream
  • Mass airflow (grams/second) - amount of air entering air intake stream
  • Throttle position - idle position = 0 percent; full throttle = 100 percent
  • Fuel level
  • Ambient air temperature
  • Air fuel ratio

You can monitor up to four parameters at a time, with each displayed along the left side of your screen. To view detailed information about any one of those factors, touch the button next to it, and the large gauge area on the right will display the information for that parameter.

Maximize Fuel Economy

Running the Driving Coach program turns your gauge display into an information hub for tracking your fuel economy. Monitoring the information presented here will give you a good indication of how your driving habits affect your fuel economy and overall engine performance.

Bully Dog Driving Coach Display

The Instant Fuel Economy graph shows real-time fuel usage. This can be displayed in either miles per gallon or kilometers per liter. The Wasted Energy graph shows your acceleration and deceleration in relation to a base centerline. The centerline represents zero wasted energy. If you accelerate or decelerate too quickly, a color bar will extend out from the centerline, so you can see how much energy that move just cost you.

The Report Card graph indicates your overall engine performance and fuel economy, and it ranges from "A" for optimal performance to "Epic Fail," indicating the need for a tune-up, as well as a change in driving habits.

Bully Dog Driving Coach Report Card

If you're not interested in fuel economy and are really only in this for the extra horsepower and torque, you can remove the Driving Coach from your monitor and instead view a large gauge of any chosen data.

Special Features for Dodge

The Triple Dog GT has several features that are unique to Dodge diesel applications. You can, for example, set up your GT to control when the door locks engage and disengage on your Ram 2500. The headlamp delay (the amount of time that the headlights remain on after the engine is turned off) can be adjusted to suit your preferences. Set certain audible or visual notifications, such as the seat belt reminder chime or the chirp emitted when you remotely lock your Ram 2500, as you see fit. And you can limit or extend the amount of time that accessories, such as the radio, stay on after the engine has been turned off. Note: These features may not be available for all models and years.

40420 BullyDog Triple Dog GT Multi-Gauge and Performance Module - Diesel - Dodge

Video of Bully Dog Triple Dog GT Gauge Tuner - Color Screen - Diesel - Dodge

Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.

Video Transcript for Bully Dog Triple Dog Performance Chip Installation - 2005 Dodge Ram

Today on our 2005 Dodge Ram with the 5.9 Cummins Diesel well be installing the Bully Dog Triple Dog GT Gauge Tuner part number BY40420D. Now this performance chip will boost the power up whatever your vehicles diesel engine as well as monitor and diagnose all in one. Youll be able to get gains and horsepower and torque. The unique driving coach program helps you maximize fuel economy. Now to begin our installation, well need to run our power wire. Well run it through the firewall here in this grommet where this cable passes through.

Now that were out here in our engine compartment, well run it up and out of the way following our factory harness to the fuse panel here. Now that we found the fuse, it powers up when the key is turned on, well use our inline fuse circuit tap kit part number F2526. Well remove the fuse, install the two fuses into the fuse holder and reinstall the holder into the fuse location that will enable this wire here coming out of our fuse block to be energized. We can then connect the power wire for our Bully Dog programmer to it. With that done, well simply take off the excess wire here in the engine compartment leaving enough wire to plug in to our DLC3 connector here under the dash.

Well then route it up towards the top of the dash. Well use the suction cup mount to mount the program or monitor in place. We can attach our bully dog programmer monitor into the other side. Now, with our monitor in place, were now ready to turn our key to the on position. Youll notice the Bully Dog programmer then comes on.

It will walk you through downloading the programming to the vehicle. That completes our installation of the Bully Dog Triple Dog GT Gauge Tuner with colored screen part number BY40420D on our 2005 Dodge Ram with 5.9 Liter Cummins Diesel.

2012 2500 by Ram Owners Who Purchased this Performance Chip Also Bought...

Replacement parts available for this product

Ram 2500 Accessories

Customer Reviews

Bully Dog Triple Dog GT Gauge Tuner - Color Screen - Diesel - Dodge - BY40420D

Average Customer Rating:  4.5 out of 5 stars   (6 Customer Reviews)

Boost the power output of your diesel engine with this tuner, monitor and diagnostic device in one. Choose from 4 different levels to get gains of up to 130 hp and 260 ft-lb of torque. Unique Driving Coach program helps you maximize fuel economy.

- BY40420D

by: Ben B.05/28/2013

I would give this an excellent but the power cord had a loose connection on the positive side, it took a while to figure it out with an ohm meter. I went to Radio Shack and bought a power adapter for a cell phone $17, as I was on the road and had no soldering iron. I am amazed that you can get more power and better fuel economy at the same time. I made the same trip with the same load from Florida to Maine with about a five mpg increase and no need to be in the right hand lane going up the mountains. I am impressed! 82217

- BY40420D

by: Chris H07/16/2014

this is well worth the price. can't believe the power change it's like having a new truck. And the increase in fuel mileage is great! 2012 6.7 cummins went from 13.2 to an unbelievable 19.9. WOW is all I can say. 141607

- BY40420D

by: Jim Goertz06/29/2015

Love the product my truck went from almost no power to great power and awesome fuel milage.!!!!!!!!! 208088

- BY40410D

by: Toby03/29/2012

Review from a similar Bully Dog Triple Dog GT in Performance Chip

Product got to me super fast they guys at E Trailer up my shipping to priority at no charge...... very pleased with their service. I Will definitely be ordering more products with them.!!! Product installed very easy with no problems on 2006 dodge ram. I'm very pleased with everything product and service. Mainly the service... 35535

- BY40410GMC

by: Kevin H.07/25/2012

Review from a similar Bully Dog Triple Dog GT in Performance Chip

Awesome!! 49320


I purchased the bully dog gt tuner new for my 2011 Chevy Silverado 5.3 engine,,, I just recently sold the 2011 Silverado and purchased a 2014 Chevy Silverado w5.3 engine,, can I use the same programmer on the new truck without problems to truck or programmer?

comment by: justin r - 01/31/2014


Both the 2011 and 2014 Silverados with 5.3L V8 use the Bully Dog GT number 40415. When a tuner flashes a program onto a truck, that programmer and truck become married. This is to prevent accidentally overwriting the saved stock file that is moved from the truck to the tunner when you first flash the new performance tune. A tuner can only store one stock file at a time. If you returned the 2011 truck back to the stock tune before you sold it then you should be able to use it on the 2014. If you are not sure whether or not you returned to stock, or you know that you did not, you can contact Bully Dog to reset the tuner but there is a fee involved typically to do so.

Patrick B - 2/5/2014

- BY40410NI

by: Michael A04/23/2015

Review from a similar Bully Dog Triple Dog GT in Performance Chip

i like it I think it is a great product 187725


Ask the Experts about this Bully Dog Performance Chip
Do you have a question about this Performance Chip?

Do you have a question about this Performance Chip?

Info for this part was:

Expert Research:
Michael L

Written by:
Lindsey S

Expert Research:
Michael H

Expert Research:
Jameson C

Expert Research:
John H

Video Edited:
Andrew L

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.

Stay Connected

Subscribe to email newsletter


privacy - we don't send unsolicited email reviews

All images, layout and content copyright