C0006

Code

Generic C — Chassis

Wheel Speed Sensor Circuit Fault

Brand: Generic

Type: C — Chassis

Views: UK: 12 EN: 62 RU: 14

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ABS warning lamp illuminated
Traction control/ESC warning and/or disabled
Possible loss of ABS function during braking
Inconsistent speed reading for affected wheel on scan tool
Brake pedal feel typically unchanged under normal braking (until ABS activates)
In some vehicles, erratic speedometer or transmission shift issues if vehicle speed input is affected

Read ABS/traction codes with a scan tool and note freeze-frame/live data
Visually inspect sensor, wiring, and connector at the affected wheel for damage, corrosion, or contamination
Check for missing or damaged reluctor/tone ring teeth and correct sensor air gap
Compare wheel speed sensor outputs on scan tool while spinning each wheel (on-lift)
Measure sensor resistance (for passive/VR) and compare to manufacturer spec
Check reference voltage (usually ~5V) and ground for active sensors

Passive (VR) sensor: DC resistance typically ~800–2000 Ω (varies by maker); AC output increases with speed (millivolts to 1–2+ VAC at low speeds)
Active (Hall/AMR/VR with electronics): reference supply ~5 V; output square wave ~0–5 V (some systems use up to 12 V); frequency proportional to wheel speed
Typical current draw for active sensors: low (single-digit mA to tens of mA) — check manufacturer spec
Waveform: clean sine-like AC for VR or clean square transitions for active sensors; excessive noise, missing pulses, or amplitude loss indicates a problem

Verify and record C0006 and any other ABS/vehicle speed codes with a scan tool; note which wheel is affected if specified.
Perform a visual inspection of sensor, connector, and tone ring at the indicated wheel. Look for contamination, missing teeth, or physical damage.
Check connector: unplug and inspect terminals for corrosion, bent pins, or water ingress. Clean and secure as necessary.
With ignition on, measure reference voltage and ground at the sensor connector (for active sensors). Confirm supply present and stable.
For passive sensors measure coil resistance (compare to spec); for active sensors backprobe output and observe switching with wheel rotation or oscilloscope.
Spin the wheel (on a lift) and monitor wheel speed readings and raw waveforms. Look for missing pulses, low amplitude, or intermittent signal during wiggle tests.
Check wiring continuity and insulation between sensor connector and ABS module; check for shorts to ground or battery.
If wiring and connector are good but signal is bad, replace the sensor. Recheck after replacement.
Inspect/repair tone ring or bearing if damaged — replace parts as required.
After repairs, clear codes, perform a road/lift test with live data and confirm no recurrence before returning vehicle to service.