Code
C065D
Generic
C — Chassis
Right Front Wheel Speed Sensor B Correlation
Views:
UK: 22
EN: 25
RU: 18
AI status
Completed
Completed
100%
Causes
- Faulty right front wheel speed sensor (B)
- Damaged, corroded or loose wiring/connector at the sensor
- Short to power or ground on the sensor circuit
- Contaminated, damaged or missing tone ring (reluctor) on the hub/axle
- Excessive air gap between sensor and tone ring
- Wheel bearing or hub damage causing noisy/irregular signal
Symptoms
- ABS warning lamp illuminated
- Traction control / ESC warning lights may be on
- Possible reduced or altered braking/ESC/traction control functionality
- Inconsistent or fluctuating wheel speed readings on a scan tool for the right front wheel
- ABS pump or unit activation at low speeds or unexpected activation
- Speedometer rarely affected unless module relies on that sensor
What to check
- Connect a scan tool and view live wheel speed data — drive at low speed or spin wheel and compare right front speed to other wheels
- Read freeze frame / freeze data associated with the code
- Visually inspect right front sensor and connector for corrosion, damage, loose pins, or water ingress
- Inspect tone ring for missing/bent teeth, heavy corrosion, or contamination (metal shavings, mud)
- Wiggle wiring harness near steering knuckle while monitoring live data for intermittent changes
- Measure sensor resistance (with plug disconnected) and compare to manufacturer spec
Signal parameters
- Passive (variable reluctance) sensors: DC resistance typically hundreds to a few kilo-ohms (commonly ~500–2000 Ω), produce AC voltage that increases with wheel speed (Vrms increases with RPM)
- Active (Hall/LS) sensors: use a reference supply (often 5V or 12V) and produce a pulsed square/TTL signal between ~0–5V; frequency proportional to wheel speed
- Frequency/number of pulses proportional to tone ring tooth count — expected steady pulse stream when wheel is rotated; amplitude or pulse width should be consistent between rotations
- At rest: near 0V AC for passive sensors; for active sensors resting output may sit at a defined idle voltage (depends on design)
Diagnostic algorithm
- Retrieve and record code(s) and freeze frame data with a scan tool. Clear codes and attempt to reproduce.
- Inspect the physical area: unplug and inspect the right front wheel speed sensor connector for corrosion, pin damage, or water. Repair or secure connector as needed.
- Visually inspect tone ring on hub/axle for damage, missing or filled teeth, heavy rust or metal debris. Clean or replace tone ring if damaged.
- With ignition OFF, disconnect sensor and measure DC resistance across sensor leads; compare to spec. If open or shorted, replace sensor.
- If passive sensor: jack vehicle, spin wheel and measure AC voltage output at the sensor plug while spinning — amplitude should increase with speed. If active: backprobe while spinning and check for correct reference supply (5/12V) and digital pulses on signal line.
- Wiggle the harness and connectors while monitoring live data to detect intermittent faults.
- Check for continuity between sensor signal and control module pin and check for short to ground/power. Repair any wiring faults found.
- If wiring and sensor check good, swap the right front sensor with another wheel sensor of same type (if vehicle supports) and re-scan. If the code follows the sensor, replace the sensor. If it stays at right front, focus on wiring/hub/tone ring or module.
- Inspect wheel bearing and hub for excessive play/noise which can affect tone ring alignment; repair as required.
- If all hardware and wiring are OK, inspect ABS control module grounds/power. Replace control module only after exhausting sensor/wiring/hub checks.
Likely causes
- Sensor failed (electrical open, shorted, or degraded output)
- Connector corrosion or bent/loose pins at the sensor
- Tone ring chipped, filled with debris, or missing teeth causing pulse dropouts
- Damaged wiring harness (pinch, chafe, or water ingress) causing intermittent short/open
Fault status
Status
Right Front Wheel Speed Sensor B Correlation — the right front wheel speed signal does not correlate with expected/reference signals (missing, intermittent or out-of-range).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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