B1071

Code

LAND ROVER B — Body

Arc piston sensor voltage

Brand: LAND ROVER

Type: B — Body

Views: UK: 21 EN: 37 RU: 20

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Page language: EN

Causes

Damaged or corroded sensor connector or wiring (open, short to Vbatt or ground)
Failed piston position/height sensor
Poor or missing ground at sensor or module
Faulty suspension control module or internal electronics
Water ingress or contamination of the sensor
Blown fuse or poor power supply to sensor

Symptoms

Suspension fault warning or message displayed on dash
Uneven ride height or sag on one corner
Reduced suspension performance or limp mode
Suspension leveling or ride height faults during drive/ignition
Diagnostic trouble code B1071 stored

What to check

Retrieve all suspension-related codes and freeze frame data with a factory-level scan tool
Visually inspect piston sensor, connector and harness for damage, corrosion, pin push-out or water ingress
Check fuses and power distribution related to suspension control and sensors
Back-probe the sensor connector to measure reference supply, signal and ground voltages with ignition ON
Wiggle harness and operate suspension while monitoring live data to detect intermittent faults
Measure continuity and resistance between sensor pins and the suspension control module

Signal parameters

Reference/supply voltage: typically the module provides a stable reference (commonly ~5 V) — check OEM spec
Signal voltage: varies with piston position (commonly within ≈0.5–4.5 V) — should change smoothly with movement
Ground: near 0 V, low resistance to vehicle chassis ground
Note: exact voltage/resistance ranges and pinouts are vehicle- and sensor-specific; consult Land Rover service data

Diagnostic algorithm

Use a scan tool to read codes and live data, then clear the code and attempt to re-create the fault.
Perform a visual inspection of the sensor, wiring harness and connector for damage, corrosion, pin deformation and water entry.
Verify fuses and power feeds to the suspension control module and sensor circuit.
Back-probe the sensor connector: with ignition ON, confirm proper reference voltage, ground and that the signal voltage changes when the piston/suspension is moved.
If signal is absent or stuck, check continuity between the sensor connector and the control module; repair any opens/shorts.
Perform a wiggle test on the harness while monitoring live data to find intermittent faults.
If wiring and connectors are good but signal is out of spec, replace the piston position sensor and retest.
If fault remains after sensor replacement, test/replace the suspension control module per OEM procedures.
After repairs, clear codes and perform any required calibrations or learn procedures for the suspension system.

Likely causes

Wiring/connector fault (most common)
Sensor electrical failure
Intermittent ground or supply voltage issue
Control module fault (least common)

Fault status

⚠️ Status

ARC piston sensor voltage out of range or intermittent — check sensor, wiring, power and ground; consult service data for pinout and voltage specs.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-2 hours

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B1071 — Arc piston sensor voltage