Chassis
generic / SAE
C0121
Valve Relay Circuit Malfunction
The ABS control module has detected a fault in the valve relay circuit, which supplies power to the ABS solenoid valves. With this fault, the module cannot energize the valves and ABS is disabled.
SystemChassis
Typegeneric / SAE
GroupC0
Range / number1 / 21
Possible causes
- Valve relay failed high
- Internal ABS module fault (relay integrated) medium
- Power supply wiring or fuse fault low
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 200–1200 €
- Estimated time: 0.5–3 h
- Component: abs valve relay
- Component: abs control module
- Component: abs hydraulic unit
Sources
References
sae:J2012