Hand Held Tuners

Add instant horsepower, increase towing torque, improve throttle response, and read diagnostic trouble codes on your 2004.5–2005 Chevy Silverado or GMC Sierra 2500HD/3500HD with our selection of LLY Duramax handheld tuners and flash programmers. A standalone handheld programmer is one of the easiest, most cost-effective performance upgrades available—simply plugging directly into your truck's OBD-II diagnostic port to flash pre-loaded, dyno-proven calibrations into your engine and transmission control modules in just minutes. Handheld tuners allow you to select tailored power levels for heavy hauling, daily fuel economy, or aggressive street driving, while also giving you the ability to calibrate your speedometer for oversized tires, adjust speed limiters, read and clear check engine light trouble codes, and log engine operating parameters. We supply industry-leading handheld programmers from trusted aftermarket manufacturers like Edge Products, SCT Performance, Bully Dog, and DiabloSport. Browse our complete inventory of 6.6L LLY Duramax handheld tuners below to unlock the full potential of your truck with simple plug-and-play simplicity.