C0030 — Left Front Tone Wheel

C0030 identifies a signal concern associated with the left-front ABS tone wheel / wheel-speed encoder; it does not by itself establish a failed sensor, bearing or complete ABS module. Land Rover bulletin SSM71883 specifically documents C0030-38 as a signal-frequency fault in covered Range Rover vehicles and identifies debris between the speed sensor and tone wheel as a possible cause. Confirm the suffix and vehicle applicability before applying its inspection advice.

Affected system: ABS wheel-speed encoding — left-front tone wheel

Symptoms

• System warning may illuminate
• Affected feature may be unavailable
• Symptoms depend on the vehicle

Possible causes

• Sensor or actuator fault, wiring or connector damage, or an underlying chassis system problem
• Module power, ground, or connector fault
• Vehicle-specific mechanical or control issue

What to check

• Record all available module faults
• Identify the affected brake, stability, steering or suspension system. Compare module data with actual operation and test the named circuit using vehicle-specific service instructions.
• Compare results with vehicle-specific service information
• Verify the repair
• Identify the affected brake, stability, steering or suspension system. Compare module data with actual operation and test the named circuit using vehicle-specific service instructions.
• Repair the verified cause and rescan all affected modules

Also written as: C0030-00, C003000, CO030 (some scan tools add the fault-type byte, e.g. -00).