C0227 on GMC
Left Front Wheel Speed Sensor Signal Erratic
C0227 on GMC vehicles indicates left front wheel speed sensor signal erratic. Au7o has documented this code across 1 GMC model — most commonly on Yukon XL. This code indicates the ABS module is getting an erratic or inconsistent signal from the left front wheel speed sensor. The signal is present but jumps around, which usually points to a mechanical problem at the wheel — such as a cracked tone ring, debris in the sensor gap, or a wobbling wheel bearing — more than a simple wiring break. ABS, traction control, and stability control may be disabled and the warning lights turned on. Operating on very rough roads can sometimes set this code even with a functioning system. Typical repair costs on GMC range from $180 to $900, depending on the specific model and root cause.
Common Causes of C0227
- •Debris or rust at the sensor/tone ring gap
- •Cracked or damaged tone (reluctor) ring
- •Worn wheel bearing causing sensor wobble
- •Failing left front wheel speed sensor
- •Loose sensor mounting or excessive air gap
- •Intermittent wiring or connector fault
- •Rough-terrain false trigger
C0227 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 C0227 across all makes →Frequently Asked Questions
What does C0227 mean on GMC?▼
C0227 stands for "Left Front Wheel Speed Sensor Signal Erratic." This code indicates the ABS module is getting an erratic or inconsistent signal from the left front wheel speed sensor. The signal is present but jumps around, which usually points to a mechanical problem at the wheel — such as a cracked tone ring, debris in the sensor gap, or a wobbling wheel bearing — more than a simple wiring break. ABS, traction control, and stability control may be disabled and the warning lights turned on. Operating on very rough roads can sometimes set this code even with a functioning system. On GMC specifically, this code is documented across 1 model.
What causes C0227 on GMC vehicles?▼
Common causes on GMC: Debris or rust at the sensor/tone ring gap, Cracked or damaged tone (reluctor) ring, Worn wheel bearing causing sensor wobble, Failing left front wheel speed sensor, Loose sensor mounting or excessive air gap. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C0227 on a GMC?▼
Repair costs on GMC range from $180 to $900, depending on the specific model and root cause.
Which GMC models have C0227 documented?▼
Au7o has documented C0227 on 1 GMC model: Yukon XL.