C0203
ABS Solenoid Valve Front Right Circuit
Fault in the front right ABS solenoid (mirror of C0200).
- 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.
- Solenoid coil openCommon
- Internal short to groundPossible
Parts involved
- ABS Solenoid Valve Fr
- ABS Hydraulic Block
- ABS Control Module
C0203 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.