C0000

Step 1: Perform visual inspection of all four wheel speed sensors and their wiring harnesses for physical damage, corrosion, debris buildup, or loose connections. Check reluctor rings for missing teeth, cracks, or metallic debris buildup.

Step 2: Using scan tool live data, monitor individual wheel speed sensor signals while rotating each wheel by hand (vehicle raised and supported). Compare voltage/frequency outputs between all sensors - readings should be consistent and smooth without dropouts.

Step 3: Test speed sensor resistance with digital multimeter at each sensor connector (typical range 800-1400 ohms). Check wiring continuity from sensor connectors to control module and verify ground circuit integrity with resistance testing (should be less than 1 ohm).

Step 4: Inspect air gap between wheel speed sensors and reluctor rings using feeler gauge (typical specification 0.020-0.040 inches). Verify reluctor rings are not loose or damaged and sensors are properly seated in mounting brackets.

Step 5: Clear codes and perform road test while monitoring live data for speed sensor dropout or erratic signals. Compare vehicle speed reading from multiple sources (speedometer, GPS, scan tool PCM data vs ABS module data) to identify which sensor or circuit is faulty.

Step 6: If all sensors and wiring test good, perform voltage supply test at sensor connectors (should have reference voltage when key on) and consider control module functionality testing or replacement if all inputs are valid but code persists.