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C0078 Chassis

Tire Diameter

Detected wheel speed implies tire diameter outside expected range — typically wrong tire size or mismatched tires.

Affected components

  • Tires

Common causes

  • High likelihood: Wrong tire size or mismatch

Possible symptoms

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

Diagnostic notes

  • The malfunction indicator lamp may illuminate
  • A drive cycle may be required after repair

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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