C0220
ABS Valve Block Supply Voltage
Supply voltage to the ABS valve block is out of range, disabling all valve control.
- 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.
- Battery undervoltageCommon
- Ground point corrodedPossible
Parts involved
- ABS Hydraulic Block
- ABS Control Module
- Power Supply Wiring
C0220 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.