Ensure dependable cold-weather starting power for your Duramax diesel with the GM 12742345 Block Heater, the updated OEM replacement part that supersedes GM Part 12705875 for 6.6L L5P engines. Built to GM’s original specifications, this block heater maintains proper engine temperature during freezing conditions—helping reduce wear and ensuring smoother starts when you need it most.
Updated OEM Replacement
This genuine GM block heater (Part #12742345) has replaced the older 12705875 design and incorporates the latest GM updates for improved fit and performance. Whether you’re repairing a failed unit or upgrading for enhanced reliability, this direct replacement part restores your engine’s cold-weather readiness.
Direct Fit for 2020-2025 Duramax Trucks
Engineered for the 6.6L L5P Duramax diesel found in 2020-2025 Chevrolet and GMC trucks, this block heater installs easily thanks to its OEM exact-fit construction and standard three-prong electrical connection. This ensures a secure, hassle-free replacement that works like the original.
Cold-Weather Performance You Can Trust
Block heaters are essential for diesel engines operating in cold climates. They keep the engine coolant warm, making starting easier and reducing strain on battery and starter systems in freezing conditions. Having a properly functioning OEM heater like this one helps protect your engine and improves day-to-day reliability.
