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GM Flashcal For Truck - 2545

Suggested retail: $222.95
Your Price: $199.95
Orders over $100 ship free. Orders placed before 2 PM MT will ship same day.
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Saves factory setting and returns easily to stock

Please note: Flashpaq PN 2545 covers up to the 2016 model year GM only.For2017+ GM coverage please refer to PN 2547.If you are a GM truck owner who is looking for a device to help calibrate for your large aftermarket tires, read/clear trouble codes, adjust your speed limiter and more, then look no further. The Flashcal for Truck is a product designed to give features and calibration tools to truck owners at a great price. The days of clunky, outdated calibration tools are over. Flashcal has trucks covered and the market cornered with quality and pricing that can't be matched. Covers 1999-2018 GMC/Chevy gas trucks and 2001-2016 GMC/Chevy diesel trucks.


Corrects speedometer for tire upgrades between 26 - 38 *
Speedometer recalibration for gear /axle swaps *
Speed/Rev Limiter Options *
TPMS Options *
Reads and clears diagnostic trouble codes
Digital Battery Voltage Display
Real-time Data Logging
Real-time Data Monitoring
Upgradeable to Flashpaq Tuning


Please note: Flashpaq PN 2545 covers up to the 2016 model year GM only.For2017+ GM coverage please refer to PN 2547.


*Features may vary based on year, make, & model.


*E-assist and hybrid vehicles not supported*

Corrects speedometer for tire upgrades between 26 - 38 *
Speedometer recalibration for gear /axle swaps *
Speed/Rev Limiter Options *
TPMS Options *
Reads and clears diagnostic trouble codes
Digital Battery Voltage Display
Real time Data Logging
Real Time Data Monitoring
Upgradeable to Flashpaq Tuning

*Features may vary based on year, make, & model.

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Questions about buying this product? Our experts are available from 8 AM – 5 PM MT. Call today at 888-227-2447. Our sales team would be happy to answer any questions you have.
GM Flashcal For Truck is rated 4.2 out of 5 by 17.
Rated 5 out of 5 by from Worth the money I bought this to turn off the afm 4 cyl mode and it did the trick with no complication. Now I can calibrate my tire size when I get bigger tires and clear codes for the same price as the competiors that just turn off afm. I am very happy with this purchase. Wasn’t wanting to tune or add power just couldnt stand the helicopter noise that my exhaust made in 4 cyl mode. This is worth every cent.
Date published: 2018-08-02
Rated 5 out of 5 by from Works as described and really easy and reliable I use this on my Hummer H2 and it works great!! Instant results you can feel and see. Easy to upgrade and lots of options for your vehicle. Thanks!!
Date published: 2017-05-02
Rated 5 out of 5 by from Works great I bought the flashcal to correct my speedometer after getting bigger tires. In less than 10 minutes it was corrected and I was back on the road. Definitely going to upgrade it to the flashpaq.
Date published: 2017-07-18
Rated 5 out of 5 by from Great product I bought to recalibrate tire size and disable AFM. Did a great job and plan to upgrade to tuner in the near future!!
Date published: 2018-02-13
Rated 5 out of 5 by from Works Well Thus tool does exactly what I need it to do. I recommend it.
Date published: 2017-12-24
Rated 5 out of 5 by from GM 2545 Flash Cal I bought this Flash Cal to update the tire size on my 2015 GMC Sierra 1500 Denali. Worked as described and very easy and quick to install. Got lucky and had a local police department who had a speed limit sign up giving you your speed. It corrected the speedometer to within 1 mph in reference to their speed device. Great product. Will be looking into upgrading to the FlashPaq at some point.
Date published: 2018-10-18
Rated 4 out of 5 by from Excellent Tech support I bought this product two weeks ago to adjust the spedo in my 2006 2500 HD. I had multiple issues with configuration and several error messages not allowing me to make any changes to my truck. After 4 tech support calls I got the correct tire size collaboration for the tires. Tech support was the highlight of the process. Thanks for doing a great job and refusing to give up.
Date published: 2018-03-12
Rated 5 out of 5 by from Works as described Followed the instructions and checked for software updates before plugging into my 2016 Chevy 1500, 5.3L. Programmed the truck for the tire size I have on. Truck shifts much better now. I’ll reprogram when I go to the next tire size. Wish I could use it on my father in laws truck. He runs 35” tires and we drive the same year/model except his is an LTZ 4X4.
Date published: 2018-06-22
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2006 gmc sierra/ 4l60e fully built, will I be able to adjust torque management for harder shifts? Computer is holding it back right now.

Asked by: MACHINE
This will not adjust TM. You will want to checkout the Dashpaq +
Answered by: Anthony M
Date published: 2019-03-06

Would I have to program any tunes on here or do they come on there already ? 

Asked by: Jonjon
The flashcal is only for tire/gear adjustments. If you are wanting power checkout the Flashpaq
Answered by: Anthony M
Date published: 2019-03-05

I have a 14 Chevy Silverado 5.3L. I want to know if this tuner will cut my 8 to 4 cylinder shut down off. 

Asked by: Keith
You will need the 2845 Flashpaq in order to disable the AFM
Answered by: Anthony M
Date published: 2019-02-26

will this work for my 2009 5.3L silverado 1500

Asked by: seffety sam
Yes it will!!
Answered by: Anthony M
Date published: 2019-02-26

Will this work for my 1999 Chevy Silverado 5.3

Asked by: Jonjon1980
Yes it will!!!
Answered by: Anthony M
Date published: 2019-02-10

Will the 2545 allow me to change the rev limiter and top speed of my 2017 GMC Sierra 5.3L 6 speed trans?

Asked by: AuFerguson12
This will not. You will want the 2845 Flashpaq
Answered by: Anthony M
Date published: 2019-02-07

Will this by pass my o2?

Asked by: Zach203
This will not. You would need one of our pro devices and a custom tune in order to do that
Answered by: Anthony M
Date published: 2019-01-30

Am I able to use it on two trucks, a 2011 Silverado with a 5.3 and a 2011 Sierra with a 5.3.

Asked by: Quinnhal
1 vehicle at a time. You would have to set the original back to stock in order to tune a 2nd vehicle
Answered by: Anthony M
Date published: 2019-01-21
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