Kleinn RSGM12 Long Range Remote Start Kit 2003-2006 2007 Classic Chevy GMC

Vehicle Fitment

• 2003-2006 Chevrolet Silverado 1500, 1500 HD, 2500, 2500 HD, 3500 (Key-to-Start, Automatic, Gas/Diesel)
• 2003-2006 Chevrolet Tahoe (Key-to-Start, Automatic, Gas/Diesel)
• 2003-2006 Chevrolet Suburban 1500, 2500 (Key-to-Start, Automatic, Gas/Diesel)
• 2003-2006 Chevrolet Avalanche 1500, 2500 (Key-to-Start, Automatic, Gas/Diesel)
• 2003-2006 GMC Sierra 1500, 1500 HD, 2500, 2500 HD, 3500, Sierra Denali (Key-to-Start, Automatic, Gas/Diesel)
• 2003-2006 GMC Savana 1500, 2500, 3500 (Key-to-Start, Automatic, Gas/Diesel)
• 2003-2006 Cadillac Escalade, Escalade ESV, Escalade EXT (Key-to-Start, Automatic, Gas/Diesel)
• 2007 Chevrolet Silverado Classic / GMC Sierra Classic (Key-to-Start, Automatic, Gas/Diesel)

Fitment Notes

• Key-to-Start ignition only - not compatible with Push-to-Start/push-button ignition systems
• Automatic transmission only - not compatible with manual transmission vehicles
• Compatible with both Gas and Diesel engines
• 2007 compatibility applies to the Classic (GMT800 platform) trim only - does not fit the 2007 redesigned GMT900 models
• Verify specific sub-model and audio system compatibility using Kleinn's fitment guide prior to installation
• Compatible upgrade: Drone Smartphone Module for app-based remote start control

Features

• Ultra-long range up to 3,000 feet - start your vehicle from nearly half a mile away
• Includes two 4-button remotes for lock, unlock, remote start, and trunk/tailgate control
• Firstech HCX pre-flashed module eliminates dealer programming and complex setup
• Semi-plug-and-play installation with vehicle-specific ADS-THR-GM12 T-harness - only one wire-to-wire connection required
• Works with both gas and diesel engines for maximum compatibility across GM's full-size lineup
• 15-minute engine runtime per remote start cycle with automatic shutoff

Specifications

• Remote Range: Up to 3,000 ft (approx. 0.5 miles)
• Remotes Included: 2x 4-Button Long Range Remotes
• Remote Start Module: Firstech HCX (Pre-Flashed)
• T-Harness: ADS-THR-GM12 (Vehicle-Specific)
• Ignition Type: Key-to-Start only
• Transmission: Automatic only
• Fuel Type: Gas and Diesel
• Runtime per Cycle: 15 minutes
• Installation Type: Semi-Plug-and-Play (1 wire-to-wire connection)
• Programmer Required: No - module is pre-flashed

Included Components

• 1x Firstech HCX Remote Start Data Module (Pre-Flashed)
• 1x ADS-THR-GM12 Vehicle-Specific T-Harness
• 2x 4-Button Long Range Remote Transmitters (up to 3,000 ft)
• 1x Installation Instructions

Product Description

The Kleinn RSGM12 is a long-range remote start system engineered specifically for 2003-2006 Chevrolet and GMC full-size trucks and SUVs, including the 2007 Silverado and Sierra Classic (GMT800 platform). Built around the Firstech HCX data module and a vehicle-specific ADS-THR-GM12 T-harness, it features a semi-plug-and-play installation that requires only a single wire-to-wire connection - making it one of the simplest remote start installs available for this platform. The module ships pre-flashed, eliminating the need for a dealer visit or programming hardware.

With an industry-leading range of up to 3,000 feet and two included 4-button remotes, the RSGM12 lets you remotely start, lock, unlock, and control your vehicle from nearly half a mile away. Compatible with both gas and diesel engines across Chevrolet, GMC, and Cadillac full-size platforms, it runs the engine for 15 minutes per cycle and supports the Drone Smartphone Module upgrade for app-based control. Verify sub-model and audio system compatibility using Kleinn's fitment guide before ordering.