Duramax L5P Thermostat 2017-2025 KB KB-6.6L-1726-THCP

KB thermostat for the Duramax L5P (2017-2025). Listed for one application: Duramax L5P engines, 2017-2025, in Chevrolet, GMC applications. Confirm your engine code and year against this listing before ordering.

What it does

The thermostat controls when coolant flows to the radiator and sets operating temperature. Stuck closed it overheats the engine; stuck open it never warms up, hurting mileage and setting a P0128. A new thermostat at the correct rating restores stable temperature.

Fits

• Chevrolet vehicles with the Duramax L5P engine, 2017-2025
• GMC vehicles with the Duramax L5P engine, 2017-2025

Fixes

• P0128 coolant temperature below regulating range
• overheating with a cool radiator
• a slow warm-up and poor heater output

What's included

• the thermostat (and housing / seal where the listing says so)

Specifications

• Brand: KB
• Part number: KB-6.6L-1726-THCP
• Shipping weight: 0.8 lb
• Condition: new
• Product type: Thermostat

Cross-reference

Replaces or interchanges with KB KB-6.6L-1726-THCP for the Duramax L5P. Check the part number stamped on your original before ordering.

Free shipping on orders of $70 or more; everything else ships with calculated shipping at the part's real weight. Questions on fitment? Ask a tech before you buy.