Transfer Case Encoder Motor for Chevy Blazer 1998-2005

This is the Dorman 600-901 transfer case shift motor for the push-button electric-shift cases GM used through the late 1990s and early 2000s. Confirmed fitment covers Chevrolet Blazer 1998-2005, S10 1998-2004, K1500 and K2500 1998-1999, K1500 and K2500 Suburban 1998-1999, Silverado 1500 1999-2002, Silverado 1500 HD and 2500 HD 2001-2002, Avalanche 1500 and 2500 2002, Cadillac Escalade 1999-2002 and Escalade EXT 2002, plus the matching GMC Jimmy, Sonoma, Sierra and Yukon models.

The failure most shops see is the same one every time: the dash button is pressed, the light flashes and the truck never actually changes range. The encoder motor has a small DC motor driving a gear train, and after 20-plus years of water sitting in the connector, the motor either drags or stops entirely. On some units the plastic gears strip and you get free movement with no shift at all.

This one is sold new, not remanufactured, with the factory-style electrical connector and a sealed plug face. Before you install it, take the time to clear the corrosion out of the vehicle-side connector and check for a solid ground - a fresh motor pushing current through a green pin will not last. After it is bolted on, cycle 2HI, 4HI and 4LO with the engine running and the truck rolling slowly so the shift fork can index, and clear any stored transfer case codes.