Code
B11F0
LAND ROVER
B — Body
Air intake damper position sensor
Views:
UK: 4
EN: 9
RU: 6
AI status
Completed
Completed
100%
Causes
- Faulty air intake/recirculation damper position sensor
- Damper actuator mechanical binding, damage, or obstruction
- Wiring fault (open, short to voltage/ground, damaged insulation)
- Poor connector pins or corrosion at sensor/actuator connectors
- Faulty HVAC/engine control module or software/calibration error
- Failed actuator (motor) that drives the damper
Symptoms
- HVAC vent mode not switching between fresh/recirculation or dash/foot/defrost correctly
- Unusual HVAC air distribution behavior or stuck in one mode
- Reduced cabin comfort or persistent recirculation/odour issues
- Malfunction indicator or HVAC warning message on dash (manufacturer-specific)
- Stored DTC and possible inability to perform HVAC self-calibration
What to check
- Use a scan tool to read freeze frame and live data for the damper position sensor and actuator commands
- Visually inspect sensor and actuator connectors for corrosion, bent pins, or looseness
- Manually operate damper (if accessible) to check for binding or obstruction
- Measure sensor supply voltage and ground at the connector with ignition on
- Back-probe sensor signal wire and confirm expected voltage change during damper movement
- Check wiring continuity between sensor and control module; look for chafing or repairs
Signal parameters
- Typical sensor type: analog position sensor (potentiometer) or hall-effect position sensor
- Supply/reference voltage: ~5 V (vehicle-specific) to sensor
- Signal output: approx. 0.5–4.5 V proportional to damper travel (closed to open) — confirm with manufacturer data
- Ground: solid reference ground required; poor ground will cause erroneous readings
- If PWM/hall type used: variable duty cycle or digital signal; check with manufacturer wiring diagram
Diagnostic algorithm
- Connect an OEM-level scan tool. Clear the code, cycle ignition, and attempt a damper/recirculation command while monitoring live sensor value and actuator command.
- If the code returns, observe live data while commanding the damper. If commanded but sensor value doesn't change or is erratic, suspect sensor/actuator or mechanical bind.
- Visually inspect connectors at sensor and actuator for corrosion, water ingress, or pin damage. Repair or replace as needed.
- With ignition on, measure sensor supply voltage and ground at the sensor connector. Confirm the sensor receives proper reference voltage (~5 V) and ground.
- Back-probe the sensor signal wire and move the damper (manually or via actuator command). Verify signal voltage changes smoothly across expected range. Look for jumps, dropouts, or stuck values.
- Check continuity between sensor signal/ground wires and the control module to rule out open or short circuits. Repair wiring faults.
- Inspect and operate the damper assembly by hand to detect binding or obstructions. Repair or replace damaged linkages or dampers.
- If wiring and mechanical parts are good but sensor output is out of spec or inconsistent, replace the damper position sensor (and consider replacing the actuator if integrated).
- After repair or replacement, perform required HVAC/actuator calibration or relearn with a scan tool, then clear codes and verify proper operation over multiple cycles.
- If problems persist and wiring/sensor/actuator check out, consider testing or reprogramming the controlling module per factory procedures or consult dealer technical service information.
Likely causes
- Sensor failure or degraded internal potentiometer
- Damper linkage seized or obstructed preventing expected travel
- Broken or disconnected signal/ground wire between sensor and module
- Corroded connector causing intermittent/incorrect voltage
- Actuator not moving while sensor indicates fixed/erratic position
Fault status
Status
Air intake/recirculation damper position sensor fault detected — sensor signal out of range or implausible.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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