ABS Wheel Speed Sensor Frequency Error
The C0029 code means the vehicle's onboard diagnostic system has detected: ABS Wheel Speed Sensor Frequency Error. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $50 - $400 (parts and labor)
Basic scanners cannot read ABS codes. BlueDriver reads all systems including ABS, SRS, and transmission through your phone.
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Basic scanners cannot read ABS codes. This one reads all four systems so you know exactly which sensor failed.
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Common Symptoms
- ABS warning light on
- Speedometer reads incorrectly
- Traction control activates unexpectedly
- Stability control malfunction
Probable Causes (Ranked by Likelihood)
- Wrong size tires installed Very High
- Damaged tone ring with missing teeth High
- Incorrect wheel speed sensor installed Moderate
- Aftermarket wheels with wrong specification Low
Step-by-Step Diagnostic Procedure
-
Compare tire sizes on all four wheels
-
Inspect all wheel speed sensor tone rings for damage
-
Verify correct wheel speed sensor part number
-
Compare wheel speed readings across all four wheels
Frequently Asked Questions
Can mismatched tires cause this code?
Yes, different tire sizes produce different wheel speed signals that trigger frequency error codes.
What is a tone ring?
A toothed ring that rotates with the wheel. The sensor reads passing teeth to determine wheel speed.
Will a tire rotation fix this code?
Only if matching tires are installed. Different sized tires on different wheels cause this issue.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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