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There is no such thing as a 'traction control sensor'.

But, If you are referring to the "Traction Control System", there are Many components that make up the Traction Control System.

The heart of Traction Control System is the "EBCM" (Electric Brake Control Module). The EBCM monitors the wheel speed sensors for Drive Wheel Slip. When drive wheel slip is noted while the brake is not applied, the EBCM will enter "Traction Control Mode".

When vehicle enters Traction Control Mode, the EBCM sends a request to the "PCM" (Power Control Module) to reduce the amount of torque to the drive wheels. If the engine torque reduction does not eliminate drive wheel slip, the EBCM will actively apply the drive wheel brakes.

The EBCM in the 05' Buick Terraza is located on the "BPMV" (Brake Pressure Modulator Valve). In other words, the EBCM is mounted on the Antilock Brake Controller.

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