B11A1

Code

LAND ROVER B — Body

Pressure restriction sensor on the right side

Brand: LAND ROVER

Type: B — Body

Views: UK: 18 EN: 46 RU: 27

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Page language: EN

Causes

Open or short in the sensor wiring or connector
Corroded, bent or pushed‑out connector pins
Failed pressure restriction sensor
Blocked, collapsed or disconnected pressure/vent line or port
Moisture or contamination in connector or sensor
Faulty module or communication error

Symptoms

Warning lamp (body or specific system) illuminated
Related system reduced performance or disabled (e.g., suspension/pressure controlled function)
Stored diagnostic trouble code and possible freeze frame data
Intermittent or permanent system fault on right side
Possible unusual behavior under certain loads or steering angles

What to check

Read and record all stored codes and freeze frame data with a manufacturer-level scanner
Visually inspect sensor, pressure lines and connector for damage, corrosion or contamination
Check routing of harness for chafing, pinching or connector strain
Inspect mating connector pins and terminals for corrosion or damage
Confirm related fuses and module power/ground are present

Signal parameters

Recommended sensor supply: typically 5 V reference (check factory data)
Typical sensor output: approx. 0.5–4.5 V proportional to measured pressure (verify with OEM data)
Signal should be stable at idle and vary smoothly with applied pressure; no intermittent open/short spikes
Expected circuit resistance: low resistance between sensor ground and chassis ground (< 5 ohms)
No short to battery voltage or ground on signal line (infinite to short depending on test)

Diagnostic algorithm

Connect diagnostic scan tool. Read and record DTC B11A1 and any related codes. Note freeze frame and live data for the pressure sensor.
Perform an on‑vehicle visual inspection of the right-side pressure sensor, its harness and pressure lines. Look for physical damage, contamination or disconnected vents.
With ignition ON (engine off as instructed by OEM), backprobe the sensor connector. Verify reference voltage (check factory spec), signal voltage and ground continuity to chassis ground.
Wiggle harness and connector while monitoring live data for intermittent faults. Repair any intermittent wiring issues.
If supply, ground and wiring are good, measure sensor output during controlled pressure changes (apply known pressure or operate the related system) and compare to OEM expected values.
If sensor output is out of range or does not change, remove sensor and inspect pressure port for blockage. If port is clean but sensor still fails, replace sensor.
After repair, clear codes and perform a road or functional test to confirm the fault does not return. Re-scan for additional codes.
If fault persists with correct sensor and wiring, consult manufacturer wiring diagrams and test the controlling module for internal faults or CAN communication errors.

Likely causes

Damaged wiring harness at right wheel/strut or routing path
Water ingress/corrosion at sensor connector
Sensor clogged by debris or blocked vent/port
Loose or damaged sensor mounting or sealing
Intermittent connector contact due to vibration

Fault status

⚠️ Status

B11A1 — Pressure restriction sensor (Right): circuit fault or out-of-range signal. Inspect sensor, pressure line, connector and wiring; verify supply/ground and replace sensor if faulty.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.7-2.0 hours

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