ABS Brake Switch Circuit
The C0023 code means the vehicle's onboard diagnostic system has detected: ABS Brake Switch Circuit. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $30 - $200 (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
- Cruise control does not work
- Brake lights stay on or do not work
- Traction control malfunction
Probable Causes (Ranked by Likelihood)
- Failed brake light switch Very High
- Misadjusted brake switch position High
- Damaged brake switch wiring Moderate
- ABS module brake switch input failure Low
Step-by-Step Diagnostic Procedure
-
Check brake light operation
-
Inspect brake light switch at brake pedal
-
Test brake switch circuit voltage with scan tool
-
Adjust or replace brake light switch as needed
Frequently Asked Questions
Can a bad brake switch cause ABS problems?
Yes, the ABS system relies on the brake switch signal to know when you are braking.
How do I test the brake light switch?
Monitor brake switch voltage on a scan tool while pressing and releasing the brake pedal.
Is the brake switch easy to replace?
Yes, it is located at the brake pedal arm and is usually a simple clip-in replacement.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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