OBD
C0030
Left Front Tone Wheel
What it means
C0030 means Left Front Tone Wheel.
Check these first
- A dirty or corroded left front tone wheel
- A worn or damaged left front tone wheel
- A failed left front wheel speed sensor
- A loose or corroded left front wheel speed sensor connector
- A fault in the ABS control module
What to do next
- Inspect and clean the left front tone wheel
- Check the left front tone wheel for missing or damaged teeth
- Test the left front wheel speed sensor and its connector
- Replace the tone wheel if it is worn or damaged
- Test the ABS control module if the signal stays bad
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.