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Home / DTC / B13EA — Left rear - Face - air duct temperature sensor

B13EA — Left rear - Face - air duct temperature sensor

Detailed page for trouble code B13EA.

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Code

B13EA

LAND ROVER B — Body

Left rear - Face - air duct temperature sensor

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

Causes

  • Faulty left rear face air duct temperature sensor (NTC thermistor)
  • Corroded, loose or damaged sensor connector
  • Broken, pinched or shorted wiring between sensor and HVAC control module
  • Water ingress or contamination at sensor or connector
  • Poor ground or missing reference voltage to sensor
  • HVAC/BCM input circuit fault or software anomaly (less common)

Symptoms

  • HVAC displays incorrect temperature for left rear face vent or no temperature reading
  • Uneven cabin temperature or incorrect blend/zone control
  • HVAC warning or message in instrument cluster (climate sensor fault)
  • DTC present in vehicle memory and may cause limited climate control behavior
  • Sensor value stuck at extreme or implausible temperature when viewing live data

What to check

  • Scan for freeze-frame and live data; view left rear face air duct temperature reading and compare to other cabin/ambient sensors
  • Visual inspection of sensor location, wiring harness and connector for damage, corrosion or water intrusion
  • Wiggle test harness while monitoring live data to check for intermittent changes
  • Unplug connector and inspect terminals for bent, pushed-out or corroded pins
  • Measure sensor resistance at ambient temperature and compare to expected thermistor curve (see signal parameters)
  • Back-probe signal and ground with a multimeter/oscilloscope to check for proper reference voltage and varying signal

Signal parameters

  • Sensor type: typically an NTC thermistor (resistance decreases as temperature increases)
  • Typical resistance reference: around 10 kΩ at 25 °C (varies by supplier) — consult specific vehicle service data
  • Expected behavior: monotonic resistance change with temperature; no sudden open/short
  • Voltage-type outputs (if present) typically 0.5–4.5 V proportional to temperature
  • Operating range: sensor should report within plausible cabin temperature range (approx. -40 °C to +85 °C capability); live reading should be near ambient cabin temp

Diagnostic algorithm

  1. Retrieve DTCs and live data with a diagnostic scanner. Note sensed temperature, freeze frame and any related HVAC codes.
  2. Visually inspect the left rear face sensor, housing and harness for physical/thermal damage, debris or water ingress. Repair or dry as necessary.
  3. With connector disconnected, measure sensor resistance across its terminals at ambient. Compare to manufacturer curve. If resistance is open or shorted, replace sensor.
  4. Reconnect and back-probe the harness while observing live data: verify the sensor signal changes when you warm/cool the sensor (finger or warm air) and that reference voltage/ground are present.
  5. Check continuity and insulation between sensor connector and HVAC control module pins. Repair any opens or shorted wires, repair harness or replace connector as needed.
  6. If harness and sensor measure within expected ranges but code returns, swap with a known-good same-location sensor (or substitute a working sensor from a similar location) to confirm sensor vs. module fault.
  7. If replacement sensor does not clear the fault, check HVAC/BCM input circuitry and grounds; consult wiring diagrams and perform module-level tests or reprogramming per service information.
  8. After repair or replacement, clear DTCs and confirm fault does not return and that live data reads plausibly under varying conditions.

Likely causes

  • Failed sensor element (most common)
  • Corroded/loose connector or water intrusion
  • Wiring open or short (chafing, rodent damage, connector terminal failure)
  • Connector pin pushed out or poor contact
  • Control module input fault (least likely)

Fault status

⚠️ Status
Left rear face air duct temperature sensor — circuit fault (open/short/implausible reading)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B13E8 B13E9 B13EB B13EC
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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