Brake Rotor Minimum Thickness - Front Right
The C0921 code means the vehicle's onboard diagnostic system has detected: Brake Rotor Minimum Thickness - Front Right. This is a critical severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $200 - $500 (parts and labor)
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Common Symptoms
- Brake pedal pulsation
- Vibration during braking
- Brake squeal or grinding
- Steering wheel shimmy when braking
Probable Causes (Ranked by Likelihood)
- Worn brake rotor below minimum thickness Very High
- Warped brake rotor from overheating High
- Uneven rotor wear from stuck caliper Moderate
- Failed rotor temperature sensor Low
Step-by-Step Diagnostic Procedure
-
Measure rotor thickness with micrometer
-
Check rotor runout with dial indicator
-
Inspect rotor surface for hot spots or cracks
-
Test rotor temperature sensor circuit
Frequently Asked Questions
What does code C0921 mean?
C0921 indicates a fault with the brake rotor minimum thickness - front right.
Can I drive with C0921?
You can drive short distances carefully. Have the brakes inspected as soon as possible.
How much does it cost to fix C0921?
Typical repair costs are $200 - $500 (parts and labor).
Sources
This page is built from documented references. Verify against your own service info before repair work.
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