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Home / DTC / B143B — Proximity Sensor 2

B143B — Proximity Sensor 2

Detailed page for trouble code B143B.

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Code

B143B

LAND ROVER B — Body

Proximity Sensor 2

Brand: LAND ROVER
Type: B — Body
Views: UK: 5 EN: 6 RU: 3
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Page language: EN

Causes

  • Failed or degraded proximity (ultrasonic/parking) sensor
  • Damaged, corroded or disconnected sensor connector
  • Wiring harness open, short to ground or short to battery voltage
  • Water ingress, contamination or physical damage to the sensor
  • Faulty body control module / parking assist module or lost communication on CAN/LIN bus
  • Sensor not calibrated or software fault after service or replacement

Symptoms

  • Dash message or instrument cluster warning for parking/proximity system
  • Audible beeps or continuous tone from parking sensors when idle or unavailable
  • Reduced or missing object detection from one side/corner of the vehicle
  • Inconsistent or fluctuating distance readings for a single sensor
  • Self-test failure of parking assist on power-up or during diagnostics

What to check

  • Read fault memory with an OEM-capable scan tool and note freeze-frame/related codes
  • Visually inspect sensor 2 and mounting for dirt, damage, water or dislodgement
  • Inspect connector for corrosion, bent pins, water seals and secure locking tang
  • Wiggle the harness at connector and along routing to try to reproduce the fault
  • Check associated fuses and relays for the parking/parking-sensor circuit
  • Compare live data for all proximity sensors to see if only sensor 2 is affected

Signal parameters

  • Sensor supply (with ignition ON) typically present at vehicle battery voltage range: ~11–14 V at the sensor feed
  • Ground continuity: low resistance to chassis ground (near 0 Ω–a few Ω)
  • Sensor output (analog type) will vary with object distance — commonly 0–5 V range or a pulse-width/frequency proportional to distance
  • If sensor uses digital bus (LIN/CAN) the sensor/module should transmit valid messages; CAN bus nodes should show expected message IDs and normal bus voltages (approx. 2.5 V at each CAN line idle)
  • Typical sensor current draw is low (often

Diagnostic algorithm

  1. Connect a dealer-level or capable scan tool, read B143B and any related codes; record freeze-frame and live sensor data.
  2. Perform a visual inspection of sensor 2: remove dirt/debris, check for cracks, deformation, or fluid contamination. Clean and reseat if required.
  3. With connector disconnected, inspect pins for corrosion, bent pins, or water residue. Repair or replace connector as required.
  4. With connector connected and ignition ON, backprobe the power pin and measure supply voltage (expected ~11–14 V).
  5. Measure ground continuity from the sensor ground pin to chassis ground (< a few ohms).
  6. Observe/measure sensor output while an object is moved in front of the sensor (voltage should change or pulses should be present). If the sensor is digital, monitor messages on LIN/CAN for expected data or node presence.
  7. Perform a wiggle test on the harness while monitoring live data or scan tool to detect intermittent faults.
  8. If power/ground/signals are out of range, trace wiring to the parking assist module / body control module and check for opens/shorts; repair wiring or replace damaged sections.
  9. If wiring and connector check good and the sensor output is still invalid, replace the sensor with a known-good unit and recheck.
  10. After repair or replacement, clear codes and perform any required sensor relearn/calibration procedure with OEM tool. Confirm correct operation and verify no return of the fault.
  11. If fault persists after replacing sensor and fixing wiring, suspect control module fault or bus-level issue and proceed with module diagnostics or replacement as directed by OEM procedures.

Likely causes

  • Contaminated/damaged sensor or mounting (most common)
  • Corroded/loose connector or damaged wiring to sensor
  • Open/short in sensor supply or ground circuit
  • Intermittent connection in harness due to chafing or water entry
  • Less likely: fault in control module or bus communication

Fault status

⚠️ Status
Stored fault for Proximity Sensor 2 — signal/supply/communication out of range or intermittent. Further inspection required to isolate sensor, wiring, or module issue.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

B143A B143C U0121 U0100 B1000
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