Code
C1700
LAND ROVER
C — Chassis
Left rear corner sensor - circuit failure
Views:
UK: 6
EN: 19
RU: 21
AI status
Completed
Completed
100%
Causes
- Open or short in the left rear wheel speed sensor wiring harness
- Corroded, loose or damaged connector at sensor or ABS module
- Failed left rear wheel speed (corner) sensor
- Damaged reluctor/target ring or excessive air gap between sensor and tone ring
- Faulty ABS/DSC control module or module connector pin fault
- Water intrusion or contamination at the sensor connector
Symptoms
- ABS and/or DSC/traction control warning lamp illuminated
- Loss of ABS/traction control functionality or limited stability control
- Possible ABS pump/motor activation at low speeds or during braking
- Inconsistent or missing wheel speed readout in live data for left rear
- Brake/drive feel may be normal when ABS is not active
What to check
- Read and record codes and freeze/frame data with a diagnostic scanner; note any related codes
- Visually inspect left rear sensor, connector and wiring for damage, corrosion or water
- Check connector seating and continuity between sensor connector and ABS module pins
- Measure sensor DC resistance (if applicable) and compare to factory range
- Spin wheel and observe sensor output with multimeter (AC) or oscilloscope (preferred)
- Check for damaged or missing tone/reluctor teeth and correct air gap
Signal parameters
- Passive (variable reluctance) sensor: DC resistance typically in the low hundreds to low thousands of ohms — varies by vehicle; AC output when wheel rotates: tens to several hundred millivolts at low speed, rising with speed
- Active (Hall/electronic) sensor: reference supply usually ~5 V or ~12 V; output is a square wave ~0–5 V or pulsed signal around reference when wheel turns
- At rest: passive sensor = ~0 V output; active sensor = static reference voltage (≈2.5–5 V depending on design)
- Oscilloscope: clean, regular sine/AC pulses (VR) or clean square pulses (Hall) with amplitude/frequency proportional to wheel speed
- Always compare measured values to factory specifications for the specific Land Rover model
Diagnostic algorithm
- Connect a diagnostic scanner, read codes and live data. Confirm C1700 and note any accompanying ABS/DSC codes.
- Visually inspect the left rear sensor, connector, wiring route, and tone ring for damage, corrosion, contamination or loose connectors.
- With ignition on (engine off), backprobe the sensor connector: verify reference supply for active sensors and check ground continuity.
- Measure sensor resistance at the connector (for passive sensors) and compare to specification. If out of range, replace sensor.
- Spin the wheel and measure AC output (passive) with a multimeter or inspect waveform with an oscilloscope; expect increasing amplitude/frequency with speed.
- Wiggle the harness while monitoring live data or oscilloscope to check for intermittent faults; repair any broken wires or poor crimps.
- Inspect the tone/reluctor ring for missing/damaged teeth and ensure correct air gap; correct or replace as needed.
- If sensor and wiring check good, swap with a known-good identical sensor from another corner and see if the code follows the sensor.
- If code remains and wiring verified, check ABS/DSC module connector pins for damage and test continuity from module to sensor connector. Repair or replace module only after wiring and sensor eliminated.
- Clear codes and perform a road test to verify repair. Re-scan to confirm code does not return.
Likely causes
- Damaged or corroded sensor connector/wiring (most common)
- Failed left rear wheel speed sensor
- Damaged tone/reluctor ring or wrong sensor gap
- Intermittent wiring break inside harness near wheel
- ABS module input/connector fault (less common)
Fault status
Status
C1700 - Left rear corner sensor circuit failure (wheel speed sensor circuit malfunction at left rear)
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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