Tech Tips (by ALLDATA): GMC Canyon with intermittent ‘brake lockup’
TECH TIPS (courtesy of ALLDATA)
Problem: This vehicle came in to the shop with the antilock brake warning indicator on. The technician connected a scan tool and pulled the codes listed below. They test drove the vehicle and confirmed that the brakes would intermittently lockup.
C0221 – Right Front ABS Channel in Release Too Long
C0040 – Right Front Wheel Speed Sensor Circuit
Details: With the scan tool, the technician observed that the right front wheel speed sensor PID would drop out and the signal was erratic. After inspecting the right front wheel speed sensor and the hub assembly, he found that the wheel hub was damaged.
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Confirmed Repair: The hub assembly was replaced, the DTCs cleared, and the vehicle test driven. No DTCs returned and the brakes operated normally.