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C0040 Chassis

Right Front Wheel Speed Sensor Circuit Malfunction

The ABS control module has detected a fault in the right front wheel speed sensor circuit. Loss of wheel speed information disables ABS and stability control, and a separate ABS warning lamp is illuminated.

Affected components

  • Wheel speed sensor
  • Abs control module
  • Tone ring
  • Sensor wiring

Common causes

  • High likelihood: Wheel speed sensor failed
  • Medium likelihood: Tone ring damaged or contaminated
  • Medium likelihood: Wiring break or chafe at wheel arch
  • Low likelihood: Wheel hub bearing with integrated sensor ring failed

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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