Conditions for Setting the DTC
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
C0221 and C0225
The EBCM detects an open or shorted wheel speed sensor or wheel speed sensor circuit for 500 milliseconds.
C0222 and C0226
The corresponding wheel speed sensor signal is less than 6 km/h (4 mph) for 5 seconds, or 120 seconds in order to set both DTCs.
C0223 and C0227
The EBCM detects an erratic signal from the corresponding wheel speed sensor for 105 milliseconds.