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Have you had any wheel or brake work done recently?
The wheel tone rings can get damaged and the sensor heads pick up metalic dust and fail to read correctly, although this is usually accompanied with a pedal reaction at low speeds.
The system will default to non active mode if a fault of any type is tripped.
The tires also need to be within a few percent of each other and a worn tread will trip the system at high speeds. Serious under inflation will do the same.
It seems you need to get the system scanned, and then you will know what part of the system the ECU thinks is bad.
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