C0500
Anti-lock Brake System Disabled
A general status code indicating that ABS function has been disabled by the brake control module. It is set in addition to the underlying root-cause code that disabled ABS.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: medium
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Common causes
Ordered by how often each turns out to be the cause.
- Underlying ABS fault disables functionCommon
- Communication bus fault to ABS modulePossible
Parts involved
- ABS Control Module
- Brake System
- Communication Bus
C0500 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.