Code
C00A200
BYD
C — Chassis
Front right wheel-speed sensor supply line short to ground
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AI status
Completed
Completed
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Causes
- Damaged or chafed wiring where the sensor supply wire contacts chassis ground
- Corroded or water-ingressed connector causing internal short
- Failed wheel-speed sensor with internal short to ground
- Improper previous repair or pinched harness (after suspension/body work)
- Short inside ABS/ESC module or connector
Symptoms
- ABS warning lamp and/or traction/stability control lamp illuminated
- Loss or limited function of ABS/ESC/traction control
- Speedometer or cruise control may behave erratically (depends on system)
- No wheel speed value or a stuck/zero reading for the front right wheel on a scan tool
- Possible diagnostic trouble codes for other systems that rely on wheel speed
What to check
- Read freeze-frame and live data with a scan tool; confirm front right wheel speed value and status
- Perform visual inspection of wheel sensor harness, connector, and routing for damage or pinching
- With ignition off, check continuity between the sensor supply pin and chassis ground (should be open/high resistance)
- With ignition ON (engine off), measure supply/reference voltage at the harness connector relative to ground and compare to spec (commonly ~5 V for many active sensors; check manufacturer spec)
- Unplug the wheel speed sensor: see if the code clears or changes (if code remains, wiring/module likely)
- Wiggle test harness while monitoring live data or DTC status to reproduce fault
Signal parameters
- Reference/supply voltage at sensor connector (typical: ~5.0 V for active sensors; some systems use other levels—refer to BYD spec)
- Passive sensor (magnetic) output: AC waveform amplitude increases with wheel speed; no supply/reference present
- Active sensor output: digital/square or sinewave referenced to supply (0–5 V or similar); frequency increases with wheel speed
- Expected open circuit (very high resistance) between supply/reference pin and chassis ground with ignition off
- Expected sensor impedance: varies by sensor type — consult manufacturer data (do not assume a single value)
Diagnostic algorithm
- Connect a capable scan tool. Document DTC(s), freeze-frame and live wheel speed data (confirm front right reading).
- Perform a visual inspection of the front right wheel sensor, connector, and wiring along full harness routing for abrasion, cuts, pinching or corrosion.
- With ignition OFF, disconnect the front right wheel-speed sensor connector. Measure continuity between the harness supply/reference pin and chassis ground. If near 0 Ω, a short to ground exists in the harness or downstream circuit.
- With connector still disconnected and ignition ON (engine off), measure the supply/reference voltage at the harness connector pin relative to chassis ground. Compare to BYD specification. No or low voltage may indicate shorting load or module fault.
- If supply pin is shorted to ground: isolate harness sections by disconnecting intermediate connectors or unplugging modules (where accessible) and repeat continuity checks to locate the shorted segment.
- If supply voltage is present and no short is found in harness, measure/verify sensor resistance and inspect sensor for water ingress or physical damage. Replace sensor if it tests out of spec or shorted internally.
- If harness and sensor appear good, inspect ABS/ESC control module connector and module outputs. Verify supply/reference driver operation; consider module bench or professional diagnostics before module replacement.
- Repair wiring or replace sensor/module as indicated. Protect repaired harness routing from abrasion and moisture.
- Clear DTCs and perform a road test. Re-scan to confirm fault does not return and that system operation is restored.
Likely causes
- Chafed harness at a wheel arch, control arm or steering knuckle causing the supply conductor to contact ground
- Failed front right wheel-speed sensor (internal short)
- Corroded/bent terminal in the wheel speed sensor connector bridging supply to ground
- Faulty ABS/ESC control module power/reference driver (less common)
Fault status
Status
Front right wheel-speed sensor supply line shorted to ground. ABS/traction control may be disabled; inspection of sensor wiring and connector recommended.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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