2008 Ford Ranger ABS issue?

2008 Ford Ranger with an ABS problem. ABS activates constantly under 25 mph. But once I hit 25 MPH the light comes on and the brakes work great at all speeds until the truck is shut off, then the problem restarts.

I have installed new pads and rotors, making sure the ABS ring is on each rotor, and identical to the worn out parts I replaced. I replaced one front ABS sensor due to damage, the other front sensor tests good. Rear sensor was pulled and cleaned, not sure how to test. Had shop diagnose the light, but the test came back "ABS system unresponsive".

Any help is greatly appreciated.

I think you need a device to read the ABS failure codes. Those codes will probably point to the failed device/sensor.

Ford had problems with tone rings that cracked at the wheel hubs, the tone ring is the part that the sensor reads. You'll need to scan it and find out which wheel(s) are triggering the problem and carefully inspect the rings.

Thank you both for your answers.

The tone rings are brand new and complete, no cracks.
The shop tried to read the code with their scan tool but could not get a response from the system.

Is there an ABS computer aside from the main PCM that I can pull and test/replace?

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