C0220ABS Valve Block Supply Voltage
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C0220 has not turned up in any accessible J2012 table, NHTSA bulletin or maker index; there is no public evidence of its use. The title refers to the voltage that feeds the solenoid valves of the hydraulic unit. In GM-designed systems such as the TRW EBC450 of the 2011 Saab 9-5, the brake control module itself feeds both the valve coils and the pump motor. A Hella/Lucas patent routes battery voltage to all valves through the contact of a fail-safe relay and checks the switched voltage behind it; a wrong value drops the relay and lights the lamp. Saab's older ESP shows a typical limit for a supply fault, below 9 V for 0.5 s above 6 km/h, stored there as C1532. A weak battery, a blown fuse, poor grounds or charging faults are frequent causes.
- What you may notice
- ABS, brake and stability lamps on, often intermittently
- ABS and traction control unavailable
- Likely causes
- LikelyLow system voltage from a weak battery or charging fault
- PossibleBlown fuse or high resistance in the module supply line
- PossiblePoor ground connection of the brake control module
- RareFaulty valve supply relay or driver inside the module
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.