C05AB: Brake Blending Separation Valve Performance
Standardized SAE J2012 code · C05xx codes
Safety-critical system. Faults in airbags, brakes, steering or high-voltage components can put people at risk. Follow the manufacturer's service information and safety procedures, or have the vehicle checked by a qualified workshop.
What does C05AB mean?
Brake blending separation valve does not respond as expected — used to isolate hydraulic and regenerative brake circuits on EVs/hybrids.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Common causes
- High Valve stuck mechanically
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of C05AB on the same make and model first.
C05AB in the community
Ask about C05ABNo one has posted about C05AB yet
Share your vehicle, the tool you used and what you tested — the first thread helps everyone who searches for this code.
Describe your C05AB problem