C0227 on Chevrolet: How to Diagnose & Fix
Left Front Wheel Speed Sensor Signal Erratic
1 Chevrolet model · 1 documented issue · $150-$600 repair
C0227 on Chevrolet by model: symptoms, diagnosis and fix
The S-series Blazer's Kelsey-Hayes ABS system is prone to age-related faults: front wheel-speed sensors (integrated into the hub bearings) corrode and give erratic signals, the EBCM ground at the radiator support gets rusty/loose, and later Kelsey-Hayes 325 modules can fail internally. Symptoms include an ABS warning light, erratic wheel-speed codes, and in some cases the ABS pump running with the key off. Corroded grounds and connectors are a very common root cause on rust-belt trucks.
Common Symptoms
- ABS warning light on
- Erratic or dropped wheel-speed signal
- ABS activating at low speed / false activation
- ABS pump running with the ignition off
- Intermittent faults that worsen when wet
How to Fix
Scan for C-codes and inspect. Clean and tighten the EBCM ground straps at the radiator support first. Replace corroded front wheel-speed sensors / hub bearing assemblies as needed. If the EBCM itself is faulty, a repair-and-return board service is a cost-effective alternative to a new module.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- ABS Wheel Speed SensorCross-ref241-1060
Fitment confirmed against the ShowMeTheParts catalog for this vehicle's year and engine.
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Sources for this issue (1)
C0227 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does C0227 mean on a Chevrolet?
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 Chevrolet it is documented across 1 model: Blazer.
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 on a Chevrolet?
Published repair estimates on Chevrolet range from $150 to $600 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.