C0227 on Chevrolet
Left Front Wheel Speed Sensor Signal Erratic
C0227 on Chevrolet vehicles indicates left front wheel speed sensor signal erratic. Au7o has documented this code across 1 Chevrolet model — most commonly on Blazer. 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 Chevrolet range from $150 to $600, 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 Chevrolet by Model
Chevrolet Blazer(1 issue)
- Kelsey-Hayes ABS: Wheel Speed Sensor / EBCM Faults & Corroded Grounds1995-1999
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.
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What does C0227 mean on 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 specifically, this code is documented across 1 model.
What causes C0227 on Chevrolet vehicles?▼
Common causes on Chevrolet: 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 Chevrolet?▼
Repair costs on Chevrolet range from $150 to $600, depending on the specific model and root cause.
Which Chevrolet models have C0227 documented?▼
Au7o has documented C0227 on 1 Chevrolet model: Blazer.