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Home / DTC / B1074 — main arc piston out of the sensor main sensor arc

B1074 — main arc piston out of the sensor main sensor arc

Detailed page for trouble code B1074.

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11,925generic
23,182specific
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Code

B1074

LAND ROVER B — Body

main arc piston out of the sensor main sensor arc

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

Causes

  • Position sensor failure or internal fault
  • Actuator/piston mechanically stuck, jammed or out of travel
  • Broken, bent or misaligned piston/lever linkage
  • Damaged wiring harness, poor connector connection, corrosion or open/short in sensor supply/signal/ground
  • Control module or software calibration fault
  • Physical obstruction or foreign debris limiting actuator movement

Symptoms

  • Warning message or fault lamp(s) related to body/suspension/roof/actuator (depending on system)
  • Related system stuck in a default position or refuse to move
  • Uneven ride height or inability to level (if suspension related)
  • Intermittent or permanent loss of function for the subsystem controlled by the piston
  • Diagnostic trouble code B1074 stored in vehicle ECU

What to check

  • Read all stored DTCs and freeze frame data with a compatible diagnostic tool
  • Check live sensor position/angle/voltage while commanding the actuator or moving the piston manually (if safe)
  • Visually inspect piston, actuator, linkages and sensor for damage, binding, contamination or misalignment
  • Inspect wiring harness and connectors for corrosion, damage or water ingress; wiggle test while monitoring signal
  • Measure sensor supply voltage, signal voltage and ground continuity with a multimeter or scope
  • Check for mechanical play, binding or seized bearings; verify the piston can travel full stroke by commanding actuator via diagnostic tool (if supported)

Signal parameters

  • Sensor supply voltage: typically ~12 V or switched 5 V (verify vehicle spec)
  • Sensor signal voltage: varies through stroke (typical 0.5–4.5 V analog position sensor)
  • Signal resistance: manufacturer sensor resistance specification (ohms) — compare to factory values
  • Actuator travel: position in mm or degrees expected at rest and at full stroke
  • Ground continuity:
  • Diagnostic bus response: availability and communication with the module (voltage and CAN data)

Diagnostic algorithm

  1. Connect a capable Land Rover diagnostic scanner, read and record DTCs and freeze frame data. Note operating conditions when fault set.
  2. Check battery voltage and charging system; if low, charge/replace battery and re-test.
  3. Visually inspect sensor, piston/actuator and linkages for damage, contamination or mechanical restriction. Remove obstruction if present.
  4. Inspect wiring and connector for corrosion, bent pins, broken wires and secure fit. Repair any damaged wiring or connectors.
  5. With connector connected, monitor live sensor output while commanding actuator through its full travel using diagnostic tool. Verify signal changes smoothly and stays within expected range.
  6. If sensor signal is flat, intermittent or out‑of‑range while actuator moves, disconnect sensor and measure supply, signal and ground at the connector. Compare to spec. Repair wiring or replace sensor as required.
  7. If sensor signals are correct but piston does not reach expected position, inspect actuator motor/valve and mechanical linkage. Repair or replace actuator if seized or weak.
  8. After repairs, clear codes, perform any required calibration/zeroing procedure with the diagnostic tool, then cycle ignition and re-test system operation and road/test as applicable.
  9. If fault persists and wiring/sensor/actuator tested good, consider control module fault; consult manufacturer technical literature and escalate to module bench tests or replacement.

Likely causes

  • Position sensor fault (intermittent or out of spec)
  • Mechanical seizure or excessive wear of the piston/actuator
  • Connector corrosion or broken wire in the sensor circuit
  • Sensor misalignment or missing retaining clip after previous work
  • Required system recalibration after repair or battery disconnected

Fault status

⚠️ Status
Main arc piston outside sensor detection range (sensor main arc). Position out of expected travel.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.0 hours

Similar codes

B1073 B1069 B1645 P0122 P0123
413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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