Code
C00AB00
BYD
C — Chassis
Rear left wheel-speed sensor general fault
Views:
UK: 8
EN: 17
RU: 8
AI status
Completed
Completed
100%
Causes
- Failed or intermittent wheel-speed sensor (rear left)
- Damaged or corroded connector or wiring harness to the sensor
- Broken or missing tone/reluctor ring on the wheel/hub
- Excessive air gap or misalignment between sensor and reluctor ring
- Wheel bearing or hub damage affecting tone ring or sensor position
- Poor ground or supply voltage to the sensor
Symptoms
- ABS and/or ESC/traction control warning lamp illuminated
- Traction control or stability control disabled or limited
- Inoperative or fluctuating wheel-speed reading for rear left when scanning
- ABS activation behaviour may be altered during braking
- Occasional drivability warnings if ECU uses wheel-speed for other functions
What to check
- Read DTCs and freeze-frame data with a diagnostic scanner; note live wheel-speed values
- Visually inspect rear left sensor, connector, and wiring for damage, chafing, corrosion, or contamination
- Backprobe sensor connector and check for proper supply voltage and ground (if active sensor)
- Measure sensor resistance (if passive) or test signal output while spinning wheel
- Compare rear left wheel-speed signal to other wheels at low speed using live data
- Inspect tone/reluctor ring for cracks, missing teeth, heavy rust, or contamination
Signal parameters
- Passive (magnetic) sensors: AC sine output frequency increases with wheel speed; typical amplitudes may range ~0.2–4 V AC depending on speed
- Active (Hall/VR) sensors: require a reference supply (commonly 5 V or sensor ground) and output a square/pulse signal 0–5 V (or 0.5–4.5 V) proportional to wheel speed
- Typical passive sensor resistance (where applicable): commonly in the hundreds to low thousands of ohms (vehicle-specific — consult factory data)
- Signal frequency: near-zero at standstill, increases linearly with wheel rotational speed; compare with another wheel at same speed for consistency
Diagnostic algorithm
- Connect a diagnostic scanner. Record C00AB00 and any other ABS/traction codes; note live rear-left wheel-speed value at rest and during slow roll.
- Visually inspect sensor mounting area, wiring, and connector for damage, corrosion, loose pins, or contamination. Repair or clean as needed.
- With ignition on, backprobe connector: verify sensor reference power (if active), ground, and reference signal while rotating the wheel. For passive sensors check resistance between sensor terminals.
- If signal absent or erratic, spin the wheel slowly and observe waveform with oscilloscope or scanner graph. Look for missing pulses, low amplitude, or noise.
- Inspect the tone/reluctor ring on hub/axle for cracks, missing teeth, heavy rust, or displacement. Check wheel bearing play and sensor air gap.
- Perform a wiggle/strain test of harness while monitoring live data to detect intermittent opens or shorts.
- If wiring/connector checks good but signal abnormal, swap rear-left sensor with another known-good sensor (if identical) and confirm whether fault follows sensor.
- If fault remains after sensor replacement or wiring confirmation, test/inspect ABS module input circuit and grounds; consult manufacturer repair manual for module bench tests.
- After repairs, clear codes, perform a road test to verify proper wheel-speed readings and that ABS/ESC warnings do not return.
Likely causes
- Wiring harness damage or connector corrosion at rear left sensor
- Failed rear left wheel-speed sensor (most common)
- Damaged or contaminated reluctor/tone ring
- Sensor air gap excessive after service or due to hub damage
Fault status
Status
Rear left wheel-speed sensor general fault detected (C00AB00). ABS/ESC may disable related features until fault is cleared or repaired.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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