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Home / DTC / B1186 — Power extractor from the luggage compartment / trunk - Failures in comparison of the signal

B1186 — Power extractor from the luggage compartment / trunk - Failures in comparison of the signal

Detailed page for trouble code B1186.

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Code

B1186

LAND ROVER B — Body

Power extractor from the luggage compartment / trunk - Failures in comparison of the signal

Brand: LAND ROVER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or corroded wiring/connector at the tailgate extractor
  • Poor ground or low battery/low supply voltage
  • Blown fuse or faulty relay supplying the extractor
  • Failed extractor motor or internal gearbox/mechanical jam
  • Faulty position sensor/encoder in the extractor
  • Control module firmware/configuration mismatch or software fault

Symptoms

  • Powered tailgate/luggage extractor does not operate or only moves partially
  • Intermittent operation or stops mid-travel
  • Audible motor noise without movement or abnormal sound
  • DTC B1186 (and possibly related B1xx codes) stored in body module
  • Tailgate/boot latch not releasing properly
  • Warning message or indicator on the dash or infotainment

What to check

  • Read and record all stored DTCs and freeze frame data with a diagnostic scanner
  • Check battery voltage (should be ~12.4–12.7 V at rest, >11 V while cranking) and charging system
  • Inspect fuses and relays related to tailgate/extractor circuit
  • Visually inspect tailgate harness, grommet, and connectors for corrosion, damage or water ingress
  • Operate the tailgate while monitoring live data (position sensor, command status)
  • Listen for motor operation and check for signs of mechanical binding

Signal parameters

  • Supply voltage to actuator when commanded: ~11–14 V (vehicle-dependent)
  • Motor current during operation: typically 1–10 A peak (use clamp/ammeter) — abnormally high suggests mechanical binding
  • Position sensor/encoder output: typically 0–5 V analog or pulse train; should change smoothly during travel
  • Connector/ground continuity: low resistance (ground
  • Diagnostic bus activity: command message present on CAN/LIN when operation requested
  • Resistance of motor windings: low ohms (manufacturer-specific) — open or very high indicates motor fault

Diagnostic algorithm

  1. Connect a compatible diagnostic tool, read all body and gateway modules, save codes and freeze frame.
  2. Clear codes and attempt to repeat the fault to confirm repeatability.
  3. Check vehicle battery state and charging system; ensure adequate supply voltage for tests.
  4. Visually inspect tailgate extractor, connectors and harness (hinge area) for damage or corrosion; repair as needed.
  5. Check fuses/relays for the extractor circuit; replace suspect components.
  6. With ignition on, command the tailgate via the diagnostic tool while monitoring live data: verify extraction command, supply voltage, motor current and position feedback.
  7. Measure voltage at the extractor connector while commanding operation. If no supply, trace back through connector, relay and fuse to module.
  8. Measure motor winding resistance and continuity; if open/shorted/abnormal, consider replacing extractor motor assembly.
  9. Check position sensor/encoder output while moving the tailgate; if no or erratic signal, inspect sensor and harness.
  10. Perform a wiggle test on wiring during operation to identify intermittent shorts/opens.
  11. Check CAN/LIN communication quality and module addressing; reflash or update module software if manufacturer TSBs apply.
  12. If electrical and communication checks pass but problem persists, consider replacing the extractor assembly or controlling module per workshop procedures.

Likely causes

  • Corroded/loose connector at the tailgate extractor
  • Broken/pinched harness in the tailgate hinge area
  • Failed extractor motor or internal position sensor
  • Blown fuse or failed relay feeding the extractor
  • Intermittent ground at extractor or control module
  • CAN/LIN wiring fault or module not responding

Fault status

⚠️ Status
Power extractor (luggage compartment) — signal comparison failure: expected extractor feedback does not match commanded/expected value.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

B1180 B1181 B1182 B1183 B1184 B1185
320

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