The ACDelco / GM 15170204 is the OE transmission fluid cooler pipe connector cap (inlet pipe cap) listed by GM for 2017–2025 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD with the 6.6L engines, including the Duramax diesel.

Features & Benefits

• OE cap for the transmission fluid cooler pipe connection, GM P/N 15170204
• GM notes it is also included with the pipe / hose & tube assembly
• Genuine GM / ACDelco OE part, designed, engineered and tested to GM standards and backed by General Motors

Application

• Chevrolet Silverado 2500 HD / 3500 HD and GMC Sierra 2500 HD / 3500 HD (2017–2025) with 6.6L Duramax diesel (also 6.6L gas, 2020+)
• GM also lists it for 2013–2015 Cadillac ATS 3.6L with auxiliary cooler

Always verify fitment by VIN or by matching the GM/ACDelco part number on your original part before ordering.

Cross-Reference / OE Numbers

• GM: 15170204