Rough Country Speedometer Calibrator, 2020-2022 LM2/L5P

Fits: 2019 thru 2022 Chevy Silverado/GMC Sierra 1500 LM2 & 2020 thru 2023 Chevy Silverado/GMC Sierra 2500HD/3500HD L5P Duramax Diesel
Easy-to-use Speedometer Calibrator helps you quickly and easily reprogram your vehicle’s speedometer to match the output from your larger than stock tires.
Your new GM 1500/2500HD/3500HD computer is designed to track the speed based on your stock tire height. When you install larger tires, there will be a discrepancy between your actual speed and the readout on your speedometer.
This plug and play device connects directly to your vehicle’s Diagnostic Link Connector Port and in just a few short minutes your speedometer reads true again! Rough Country’s Speedometer Calibration Devices don’t just simply change your in-dash readout, they update your vehicle’s ECM, ensuring accurate shift points and proper electronic stability control.
Finally, you can get an affordable and accurate speedometer calibration with an easy and intuitive setup process! This device also includes a function to reset the speedometer back to stock prior to servicing the vehicle. Includes a 1-Year Warranty.

Features:

Resets your speedometer to accurate readings for larger tires.
Easy Plug and Play connection - 5-10 minute install.
Updates OE ECM Shift Points to accommodate larger tires.
Recalibrates Electronic Stability Control to work with larger tires.
Option to return to stock settings.
1-year warranty
Includes:

(1) Speedometer Recalibrator
(1) USB Update Cable
Important Notes:

Does NOT fit 2022+ refresh models
Download the latest software update here. https://www.roughcountry.com/speedcal-update?find=2021-chevy-silverado-2500-hd-4wd-752712
THE MANUFACTURE, SALE, OFFER FOR SALE, OR INSTALLATION OF THIS PRODUCT IS NOT LEGAL IN CALIFORNIA