Code
C200A
LAND ROVER
C — Chassis
rear wheel speed sensors of the axle exchanged
Views:
UK: 7
EN: 11
RU: 7
AI status
Completed
Completed
100%
Causes
- Rear left and right wheel speed sensors physically swapped during service or replacement
- Sensor connectors or harnesses swapped at the module or junction
- Incorrect sensor fitted (wrong part number or side-specific sensor installed on opposite wheel)
- Damaged/shorted wiring or poor connector contact causing incorrect sensor identification
- Aftermarket sensor with different polarity or signal type
- Reluctor/tone ring damage or excessive air gap leading to inconsistent signals
Symptoms
- ABS, DSC or traction control warning lamp illuminated
- Stability/traction control intervention or reduced function
- Differing wheel speed values reported by scan tool for rear left vs rear right
- ABS activation where not expected or reduced ABS function
- Possible uneven braking feel or selective ABS engagement
- Occasional or persistent fault stored in ABS module
What to check
- Read and record all stored ABS/ESP codes and freeze frame data with a capable scan tool
- Compare live wheel speed sensor values at rest and during slow wheel rotation (spin each rear wheel) using a scan tool
- Visually inspect sensors, connectors, wiring harness and tone rings for damage, corrosion or debris
- Confirm the part numbers on both sensors (verify if sensors are side-specific)
- Measure sensor resistance (for passive sensors) and check for open/short circuits
- Check continuity between sensor connector and ABS module pins; verify no cross-wiring
Signal parameters
- Passive (magnetic) sensor: DC resistance typically ~800–1600 Ω (manufacturer-specific). Measured AC voltage when wheel rotated: up to several volts peak-to-peak; frequency proportional to speed
- Active (Hall/VR active) sensor: supply 5 V (or vehicle supply), output square wave 0–5 V; frequency proportional to wheel speed
- Expected behavior: symmetrical signals from left and right rear sensors when wheels rotated at same speed (matching frequency and amplitude within tolerances)
- No continuity/very high resistance indicates open circuit; near-zero indicates short to ground or power
Diagnostic algorithm
- Connect a diagnostic scan tool, read all ABS/traction codes and live data. Note rear left and right wheel speed readings at rest and while spinning each rear wheel individually.
- Visually inspect sensors, connectors and tone rings for obvious faults, corrosion, debris, or missing teeth on tone ring.
- With ignition off, disconnect each rear sensor and confirm part numbers and orientation. Verify sensors are installed on the correct sides if side-specific.
- Measure each sensor's resistance and compare to specification. Check for short to ground/power.
- Reconnect and with vehicle safely raised, spin each rear wheel. Observe live sensor waveforms/values with oscilloscope or scan tool. Confirm both sensors produce similar signals when wheel speeds are matched.
- If a sensor shows incorrect signal, swap sensors between left and right wheels and repeat spin test. If the fault follows the sensor, replace the sensor. If the fault stays with the location, inspect wiring/tone ring.
- Check continuity and pin-to-pin wiring from sensor connector to ABS module to ensure no swapped wires at connectors or splices.
- Repair/replace damaged sensor, wiring, connectors, or tone ring as required. Refit sensors in correct positions if they were swapped.
- Clear codes and perform a calibrated test drive to confirm normal wheel speed readings and that the warning lights do not reappear. Re-scan and verify no reoccurrence.
Likely causes
- Sensors were removed and refitted on opposite sides (most common after brake/axle work)
- Harness connectors swapped at a splice/junction or at the ABS module
- Replacement sensor is side-specific and installed on the wrong wheel
- Corroded or loose connector causing intermittent signal that mimics swapped sensors
- Incorrect sensor coding or configuration in the control module after replacement
Fault status
Status
Rear wheel speed sensors of the axle exchanged — rear axle wheel speed signals inconsistent or swapped
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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