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C0121 Chassis

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.

Affected components

  • Abs valve relay
  • Abs control module
  • Abs hydraulic unit

Common causes

  • High likelihood: Valve relay failed
  • Medium likelihood: Internal ABS module fault (relay integrated)
  • Low likelihood: Power supply wiring or fuse fault

Possible symptoms

  • ABS warning light on
  • ESC/stability control deactivated
  • Possible reduced brake assist
  • Speedometer may behave erratically

Sources

Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.

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