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Home / DTC / B11A3 — Gyroscope error

B11A3 — Gyroscope error

Detailed page for trouble code B11A3.

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B11A3

LAND ROVER B — Body

Gyroscope error

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

Causes

  • Failed or intermittent gyroscope/IMU sensor
  • Poor power supply (battery/ignition voltage) or damaged ground
  • Open, shorted, corroded or disconnected wiring/connector to the sensor
  • CAN bus or module communication errors
  • Sensor not calibrated or calibration corrupted
  • Module software or firmware fault

Symptoms

  • Traction control, stability/control system warnings or lamps illuminated
  • Loss or reduction of electronic stability/traction functions
  • Diagnostic trouble codes stored related to vehicle dynamics/IMU
  • Possible vehicle handling oddities under certain conditions
  • No obvious drivability change if fault only affects stability sensors

What to check

  • Read all stored and pending DTCs and freeze frame data from all control modules
  • Check and record battery voltage with ignition on and cranking (should be 11–14 V at rest/operating)
  • Visually inspect gyroscope/IMU connector and wiring for corrosion, damage, or water ingress
  • Check for continuity, short to power/ground and resistance of power and ground circuits to the sensor
  • Scan CAN bus for communication errors, bus-off conditions or related U-codes
  • Confirm software/ECU calibrations and module software levels; check technical service bulletins

Signal parameters

  • Supply voltage to sensor: typically ~11–14 V (vehicle battery) and any referenced 5 V sensor supply should be present
  • Analog/digital sensor output: at rest angular rate ≈ 0 °/s; moving shows ± angular rate in deg/s (manufacturer-specific ranges)
  • CAN/serial communications: regular message/heartbeat frequency (often 10–200 Hz depending on system); missing or corrupted messages indicate comms fault
  • Noise/offset: small steady bias only; large offset or excessive noise indicates sensor fault
  • Diagnostic responses: self-test/fault flags set in sensor and returned via CAN when fault present

Diagnostic algorithm

  1. Connect a capable scan tool to read B11A3 plus related codes across all modules; note freeze frame and battery voltage at time of fault.
  2. Inspect sensor and harness: check the connector for corrosion, bent pins, water, physical damage. Repair or reseal if needed.
  3. Verify supply and ground at the sensor connector with multimeter: battery voltage present on power pin(s), solid ground on ground pin(s).
  4. Check continuity and for shorts between sensor power, ground and CAN lines back to the controlling module. Repair any wiring faults.
  5. Monitor live data from the gyroscope/IMU with the scan tool: at rest the angular rates should be near 0; look for frozen, erratic or out-of-range values.
  6. Check CAN bus health: view message frequency, error counters and any U-series communication codes. Repair CAN faults before replacing sensor.
  7. If wiring and communications are good but sensor outputs are invalid or self-test fails, replace the gyroscope/IMU with a manufacturer-approved unit.
  8. After replacement, perform required module/sensor initialisation, alignment or calibration procedures as specified by the manufacturer.
  9. Clear codes and perform road test/verification to ensure code does not return and system functions correctly.
  10. If code persists after replacement and correct calibration, consult manufacturer technical service information for possible module firmware updates or deeper diagnostics.

Likely causes

  • Water intrusion/corroded connector at the gyroscope/IMU
  • Faulty gyroscope/IMU unit (internal failure)
  • Open or short in power, ground or CAN wiring to the sensor
  • Loss of CAN communication or intermittent bus errors
  • Required sensor/module calibration not performed after service or replacement

Fault status

⚠️ Status
Gyroscope/IMU fault detected — sensor data invalid or communication error.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-4.0 hours

Similar codes

B11A1 B11B3 U0121 U0424 U0401
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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