Fits: 2024 thru 2025 Chevy Silverado/GMC Sierra 2500HD/3500HD L5P Duramax Diesel

Complete the final touch on your lifted vehicle with Rough Country’s Speedometer Calibration Device! Designed for ease of use, this device quickly and effortlessly recalibrates your vehicle’s speedometer to ensure accurate readings when using larger tires.

Resolve Speedometer Discrepancies with Ease: Your vehicle’s computer is calibrated for stock tire sizes, meaning when you upgrade to larger tires, your speedometer will no longer reflect your true speed. With the Speedometer Calibration Device, you can eliminate this issue and restore accuracy.

Plug-and-Play Installation: This plug-and-play device connects directly to your vehicle’s TCM and BCM, making it simple to recalibrate your speedometer in just a few hours. No complex setup or tools needed.

Optimized for Larger Tires: Rough Country’s Speedometer Calibration Device doesn’t just adjust your speedometer—it updates your vehicle’s ECM to accommodate larger tires. This ensures precise shift points and recalibrates your electronic stability control (ESC) for safe and smooth driving.

Easily Return to Stock Settings: Need to revert to factory settings? No problem! This device includes a convenient option to reset your vehicle’s speedometer back to stock prior to servicing or selling.

Complete Peace of Mind with a 1-Year Warranty: Enjoy worry-free performance with a 1-year warranty, ensuring your calibration device delivers reliable results for years to come.

Notes:

Download the latest software update here.
ONLY fits models equipped with a 10-speed transmission.
Rough Country's Speedometer Calibrator can only be used with one vehicle at a time. As with all other programmers, once programmed, the programmer is locked to that vehicle and cannot be used with any other vehicles until the programmed vehicle is returned to stock settings.
THE MANUFACTURE, SALE, OFFER FOR SALE, OR INSTALLATION OF THIS PRODUCT IS NOT LEGAL IN CALIFORNIA

Installation Instructions

L5P: 2024+ SILVERADO & SIERRA