Brake Component Life Monitor
The C0991 code means the vehicle's onboard diagnostic system has detected: Brake Component Life Monitor. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- hard
- Estimated cost
- $100 - $600 (parts and labor)
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Common Symptoms
- Brake warning light on
- Brake service reminder on dashboard
- Reduced braking performance
- Brake pedal feel abnormal
Probable Causes (Ranked by Likelihood)
- Brake system needs servicing Very High
- Restricted brake line High
- Air in brake system Moderate
- Brake system software needs update Low
Step-by-Step Diagnostic Procedure
-
Inspect entire brake system for issues
-
Check brake lines for restrictions
-
Bleed brake system of air
-
Perform brake system self-test with scan tool
Frequently Asked Questions
What does code C0991 mean?
C0991 indicates a fault with the brake component life monitor.
Can I drive with C0991?
You can drive normally but schedule brake service soon.
How much does it cost to fix C0991?
Typical repair costs are $100 - $600 (parts and labor).
Sources
This page is built from documented references. Verify against your own service info before repair work.
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