B11F4

Code

LAND ROVER B — Body

Minor impact counter exceeded

Brand: LAND ROVER

Type: B — Body

Views: UK: 15 EN: 27 RU: 14

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Repeated minor impacts (bumps, curb strikes, door slams) triggering impact sensors
Faulty or degraded impact/accelerometer sensor
Intermittent or corroded wiring/connector to the impact sensor or SRS/body control module
Module memory or software fault (incorrect counter reset or corruption)
Post-repair not reset/cleared event counters after a verified repair
Low or unstable battery/voltage causing false counts

Symptoms

DTC B11F4 stored in body/SRS module fault memory
Possible dashboard message or warning related to safety systems (check SRS/airbag or vehicle status)
Vehicle may have restricted functionality for some safety or active systems until inspected
No obvious major structural damage — events are typically low energy

What to check

Retrieve all stored DTCs and freeze frame/event log from body control and SRS modules using a capable scan tool
Check impact event counter and timestamps in module event log to determine frequency and timing of events
Inspect impact/accelerometer sensor(s) for physical damage, correct mounting and security
Inspect wiring harnesses and connectors for corrosion, chafing, or loose pins between sensors and module
Measure sensor supply and signal voltages with key on to check for intermittent power issues
Verify vehicle battery voltage and charging system health during tests

Signal parameters

Impact sensor event count / minor impact counter value
Accelerometer raw/processed delta‑g or event flag
Impact sensor supply voltage (Vcc)
Sensor signal voltage or CAN message payload (impact event flag, timestamp)
Module internal status: event log entries, reset flag, last event time
Vehicle battery voltage during events

Diagnostic algorithm

Connect full‑function diagnostic tool and read all modules; record B11F4 and any related codes and freeze frame data.
Review the body/SRS module event log to determine when and how many minor impact events were recorded and if they correlate with customer complaints.
Visually inspect each impact/accelerometer sensor: check mounting tightness, bracket condition, and for physical damage or contamination.
Inspect and wiggle test wiring and connectors for intermittent faults; repair any damaged wiring, secure connectors and clean corrosion as needed.
Verify sensor supply and signal integrity with diagnostic tool or multimeter/oscilloscope while reproducing normal vehicle conditions (do not simulate high‑energy impacts).
If wiring and connectors are good, replace suspect sensor(s) one at a time and clear the code; compare event counter behavior afterward.
If a module replacement or software update is performed, ensure correct programming, calibration and that event counters are reset per manufacturer procedure.
After repairs and clearing codes, perform a road test and re‑check event log for recurrence. If events persist, escalate to module/software support or specialist for deeper analysis.
Note: Work on SRS/airbag related components should be carried out by trained personnel following manufacturer safety procedures.

Likely causes

Impact sensor mounted loosely or damaged and generating false events
Connector contamination or broken wire causing intermittent pulses to module
Vehicle has sustained multiple minor impacts (parking lot/curb) that legitimately exceeded the counter
Module software/firmware bug or incomplete initialization after a service event

Fault status

⚠️ Status

Minor impact counter exceeded — the impact/event counter in the body/SRS module has recorded more minor impact events than the configured threshold. The module has flagged this condition for inspection.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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