C0227 on 2000-2006 GMC Yukon XL — Left Front Wheel Speed Sensor Signal Erratic
1 vehicles · 1 makes · $180-$900 repair
Most Reported On
C0227 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2000-2006 GMC Yukon XL, with repair costs ranging from $180 to $900.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose C0227, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
What does C0227 mean?
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.
What are the most common causes of C0227?
The most common causes of C0227 are: 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. The specific cause varies by vehicle.
How much does it cost to fix C0227?
Repair costs for C0227 range from $180 to $900, depending on the vehicle and root cause.
Which vehicles are affected by C0227?
Au7o has documented C0227 across 1 vehicle models from 1 manufacturers: GMC.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.