C0221 on GMC
Right Front Wheel Speed Sensor Circuit Open
C0221 on GMC vehicles indicates right front wheel speed sensor circuit open. Au7o has documented this code across 1 GMC model — most commonly on Yukon XL. This code indicates the ABS module detected an open circuit in the right front wheel speed sensor circuit — meaning the signal path is broken and no usable wheel-speed data is coming from that corner. The sensor provides essential input for ABS, traction control, and stability control, so those systems are usually disabled when the signal is lost. The ABS and possibly traction/brake warning lights will come on. Normal (non-ABS) braking remains available. Typical repair costs on GMC range from $180 to $900, depending on the specific model and root cause.
Common Causes of C0221
- •Open/broken wiring to the sensor
- •Failed right front wheel speed sensor
- •Disconnected or corroded sensor connector
- •Damaged harness near the wheel (flex/chafe point)
- •Corrosion at the ABS module connector
- •Damaged tone (reluctor) ring
- •Poor ground in the sensor circuit
C0221 on GMC by Model
GMC Yukon XL(1 issue)
- Front Hub Bearing and ABS Wheel Speed Sensor Corrosion Causing Unwanted ABS Activation2000-2006
GMT800 SUVs commonly develop corrosion under the front wheel speed sensors or wear in the hub bearing assembly, which alters the low-speed wheel speed signal. The result is unexpected ABS activation at parking-lot speeds, longer stopping distances, and a pulsating brake pedal even on dry pavement. GM documented this condition in service bulletins, and owners frequently report replacing hub assemblies to cure it.
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View C0221 across all makes →Frequently Asked Questions
What does C0221 mean on GMC?▼
C0221 stands for "Right Front Wheel Speed Sensor Circuit Open." This code indicates the ABS module detected an open circuit in the right front wheel speed sensor circuit — meaning the signal path is broken and no usable wheel-speed data is coming from that corner. The sensor provides essential input for ABS, traction control, and stability control, so those systems are usually disabled when the signal is lost. The ABS and possibly traction/brake warning lights will come on. Normal (non-ABS) braking remains available. On GMC specifically, this code is documented across 1 model.
What causes C0221 on GMC vehicles?▼
Common causes on GMC: Open/broken wiring to the sensor, Failed right front wheel speed sensor, Disconnected or corroded sensor connector, Damaged harness near the wheel (flex/chafe point), Corrosion at the ABS module connector. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C0221 on a GMC?▼
Repair costs on GMC range from $180 to $900, depending on the specific model and root cause.
Which GMC models have C0221 documented?▼
Au7o has documented C0221 on 1 GMC model: Yukon XL.