C0114

Code

Generic C — Chassis

Wheel Speed Sensor Circuit Fault

Brand: Generic

Type: C — Chassis

Views: UK: 8 EN: 14 RU: 10

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Damaged or contaminated wheel speed sensor
Open or shorted sensor wiring or connector (corrosion, broken wire, pin pushed out)
Faulty wheel speed sensor (VR or Hall)
Damaged or missing tone/ring (reluctor) or excessive air gap
Poor sensor ground or reference voltage (ECU connector or chassis ground)
Faulty ABS/traction control module or internal driver circuit

Use a scan tool to read live wheel speed sensor values at each wheel and compare while driving slowly in a straight line
Visually inspect sensor and tone ring for damage, debris, rust, missing teeth or large air gap
Inspect connector for corrosion, bent pins, pushed-out terminals, and ensure proper mating
Wiggle harness and connector while monitoring live data for intermittent changes
Check vehicle service info for sensor type (VR vs Hall) and specified test values

Variable Reluctance (passive) sensor: DC resistance typically ranges from ~500–1,500 Ω (highly manufacturer dependent); produces AC voltage that increases with wheel speed (tens of mV at very low speed to ~1 V or more at higher speeds)
Active/Hall-effect sensor: typically uses a 5 V reference and ground; produces a square/pulse waveform 0–5 V (some systems use 12 V signals) with frequency proportional to wheel speed
Pulse frequency vs speed: should be steady and proportional to wheel RPM with no missing pulses or long pauses
Open-circuit: infinite resistance; short to ground or battery will show near 0 Ω or fixed voltage — compare to manufacturer spec

Connect a scan tool and confirm C0114 and any related codes; note freeze frame data and event count
Record live wheel speed values for all wheels at low vehicle speed (1–10 km/h or 1–6 mph). Identify which wheel reads differently or not at all
Visually inspect the suspect wheel sensor, tone ring/reluctor, and mounting. Remove debris and check air gap to spec
Inspect wiring and connector for damage, corrosion, water intrusion or rubbed-through insulation. Repair any damaged harness or connector pins
Backprobe sensor connector with ignition ON (engine off) and measure reference voltage and ground for active sensors; verify signal output by rotating wheel (0–5 V pulses)
For VR sensors measure DC resistance and check for AC voltage while spinning the wheel with a helper or using a drill — signal should increase with speed
Wiggle harness and connectors while observing live data to detect intermittent faults
If wiring and connectors check OK but no signal, replace the wheel speed sensor and retest
If new sensor still fails and wiring is good, check ECU power/ground and diagnostic pin outputs; consider module repair or replacement per manufacturer procedures

Wiring connector corrosion or loose pin at wheel hub
Contaminated sensor or debris on tone ring
Broken/abraded wiring inside harness near wheel or suspension articulation point
Failed wheel speed sensor element