C0300
Inlet Valve Front Left Performance
The front left inlet solenoid valve does not respond hydraulically as expected during ABS self-test.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: hard
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.
- Valve stuck due to brake fluid debrisCommon
- Coil resistance driftPossible
Parts involved
- ABS Solenoid Valve Fl
- ABS Hydraulic Block
C0300 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.