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Genuine GM 86784913 Emission Reduction Fluid (DEF) Tank Maintain your vehicle’s environmental compliance and engine performance with this Genuine GM 86784913 Emission Reduction Fluid Tank. Specifically engineered for the 3.0L Duramax Turbo-Diesel engine, this tank is a critical part of the exhaust after-treatment system. Over time, DEF tanks can suffer from internal heater failures or sensor malfunctions which trigger "Limp Mode" or speed limitations. This ACDelco Original Equipment (OE) replacement ensures a perfect factory fit and restores the full functionality of your emission reduction system. It includes the necessary reservoir housing designed to withstand the corrosive nature of diesel exhaust fluid. Key Features OEM Quality: Manufactured to the strict performance and durability standards of General Motors. Full Compatibility: Designed specifically for the LM2 and LZ0 3.0L Diesel engine platforms. Direct Interchange: Replaces previous GM part numbers 84808698, 84856833, 84990578, and 86772598. Critical System Component: Essential for clearing "Service Emission System" dash warnings and preventing engine power derate. Vehicle Compatibility This tank fits full-size GM SUVs and trucks equipped with the 3.0L Diesel engine (typically 2021–2025): Chevrolet: Tahoe, Suburban, Silverado 1500 GMC: Yukon, Yukon XL, Sierra 1500 Cadillac: Escalade, Escalade ESV Technical Specifications Attribute Details Brand Genuine GM / ACDelco Part Number 86784913 Engine Fitment 3.0L I6 Turbo-Diesel Other Names DEF Tank, Reductant Tank, Reservoir Replaces 86772598, 84990578