C0150

Code

Generic C — Chassis

Wheel Speed Sensor Circuit Fault

Brand: Generic

Type: C — Chassis

Views: UK: 11 EN: 8 RU: 9

AI status

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Page language: EN

Causes

Damaged or contaminated wheel speed sensor (magnetic/ Hall-effect)
Broken, chafed, corroded, or disconnected wiring or connector
Short to ground or short to battery in the sensor circuit
Damaged or missing tone ring/reluctor or excessive wheel bearing play
Faulty ABS/traction control module or poor module power/ground
Intermittent connector contact due to water/ corrosion

Symptoms

ABS warning lamp (and/or traction control/stability light) illuminated
ABS or traction control disabled (wheel slip control inactive)
Inconsistent or zero wheel speed reading for one wheel on scan tool
Brake pedal pulsation only during ABS events or loss of ABS function
Possible speedometer irregularity (on vehicles that use wheel sensors for speed)

What to check

Read and record all ABS/traction DTCs with a scan tool; capture freeze frame and live wheel speed data
Visually inspect wheel sensor, wiring harness, and connector for damage, corrosion, debris, or oil/grease
Check ABS module power and ground circuits and related fuses/relays
Measure sensor resistance and compare to specification; check for open/short
Probe sensor signal while spinning the wheel (with vehicle securely lifted) and observe waveform/voltage on oscilloscope or scan-tool live data
Inspect tone ring/reluctor for missing/broken teeth, heavy rust, or excessive air gap

Signal parameters

Passive (variable reluctance) sensor: resistance typically 500–2,000 ohms (varies by vehicle); produces AC sine wave whose amplitude increases with wheel speed (tens of mV at low speed to several hundred mV at higher speed)
Active (Hall/VR with amplifier) sensor: typical square/pulse output 0–5 V (or 0–12 V on some systems) with frequency proportional to wheel speed
Expected frequency: 0 Hz at stationary; increases linearly with wheel rpm. Example: ~100–200 Hz at moderate road speeds (vehicle-specific)
Open circuit: infinite resistance/OL; short to ground: near 0 ohms; short to battery: constant battery voltage on signal line
Voltage supply to active sensors typically 5 V reference (verify per vehicle)

Diagnostic algorithm

Use a scan tool to confirm C0150 and view live wheel speed data; note which wheel shows no or erratic speed.
Visually inspect the suspect wheel sensor, tone ring, connector, and wiring for damage, debris, or corrosion; clear any debris and reseat connector.
With ignition off, disconnect sensor connector and measure sensor terminal resistance (or resistance to ground) and compare to manufacturer spec; check for opens or shorts.
Check reference power and ground to the sensor (with connector connected) using a multimeter; verify proper supply voltage (active sensors) and good ground.
With vehicle safely lifted and wheel off the ground, probe the sensor signal while spinning the wheel by hand or slowly rotating; observe waveform with oscilloscope or scan-tool live data for amplitude, frequency, and noise.
If the sensor signal is absent or erratic, swap with a known-good same-side sensor (if available) or temporarily connect a good sensor to verify wiring vs sensor failure.
Inspect tone ring/reluctor for damage or excessive air gap; measure air gap and repair or replace tone ring or adjust as needed.
If wiring and sensor test good but fault persists, back-probe at ABS module connector to check for signal arrival and proper module inputs; inspect for intermittent faults while wiggling harness.
If wiring and module inputs are good, consider ABS module internal fault or short; perform module bench testing or replacement according to manufacturer procedures.
After repair, clear codes, perform road test and re-scan to confirm the fault is resolved and no new codes set.

Likely causes

Damaged or contaminated wheel speed sensor
Open or corroded connector/wiring at the wheel hub
Damaged tone ring (cracked, missing teeth) or excessive air gap
Poor ground or low module supply voltage

Fault status

⚠️ Status

Wheel speed sensor circuit fault detected. ABS/traction control module has detected an electrical or signal problem on a wheel speed sensor circuit; service required to restore ABS/traction function.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2 hours

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