C0030
Left Front Wheel Speed Sensor Circuit Range/Performance
The signal from the left front wheel speed sensor is implausible relative to the other wheels. Typical causes are excessive air gap, contaminated tone ring or partial sensor failure.
The signal from the left front wheel speed sensor is implausible relative to the other wheels. Typical causes are excessive air gap, contaminated tone ring or partial sensor failure.
Common causes
- high
Metal debris on tone ring (magnetic encoder)
One of the most commonly reported causes for this code — check this first.
Typical part cost: $90-440
- medium
Sensor air gap too large
A plausible cause — test and verify before replacing parts.
Typical part cost: $90-440
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
See related trouble codes
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Frequently asked questions
What does C0030 mean?
C0030 means "Left Front Wheel Speed Sensor Circuit Range/Performance". It is a generic OBD-II code that points to a fault in the chassis.
What are the most common causes of C0030?
metal debris on tone ring (magnetic encoder); sensor air gap too large; sensor intermittent at temperature — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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