B13EC

Code

LAND ROVER B — Body

Left rear - Foot - air duct temperature sensor

Brand: LAND ROVER

Type: B — Body

Views: UK: 20 EN: 26 RU: 21

AI status

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Page language: EN

Causes

Open or shorted sensor wiring or connector to the climate control module
Corroded, loose or contaminated sensor connector
Failed/defective temperature sensor (NTC thermistor)
Water ingress or physical damage to sensor or duct
Faulty climate control / body control module or poor ground

Symptoms

HVAC left rear foot zone temperature incorrect or not responding
Occupant complaints of no/incorrect heating or cooling at left rear foot area
DTC stored and may trigger a cabin comfort warning or limited HVAC functionality
Possible intermittent HVAC operation in the rear left zone

What to check

Read and record freeze frame and live data from climate control module
Visually inspect left rear foot air duct sensor and connector for damage or moisture
Wiggle test wiring while monitoring live sensor value to reproduce fault
Check for related DTCs for other cabin temperature sensors or module faults
Verify good battery voltage and vehicle ground integrity

Signal parameters

Sensor type: typically an NTC thermistor (resistance decreases as temperature increases)
Typical open-circuit detection: extremely high or infinite ohms at the sensor
Typical short detection: near 0 ohms or short to 0 V/ignition voltage
Expected signal voltage range (approx): ~0.1–4.9 V depending on temperature and vehicle design
Expected resistance range (typical NTC): ~1 kΩ to 100 kΩ across temperature extremes (manufacturer-specific)

Diagnostic algorithm

Verify code and capture live data: Connect a diagnostic tool, confirm B13EC is present, record the sensor PID value and related HVAC data.
Visual inspection: Access left rear foot air duct sensor, inspect for water, damage, loose clips, or connector corrosion.
Check connector and wiring: Disconnect connector, inspect pins, apply dielectric cleaner if corroded, reseat firmly.
Backprobe & measure: With connector connected and ignition/key on, backprobe signal and ground pins; verify sensor voltage moves with temperature (blowing warm/cold air or using IR heat).
Resistance check: Remove sensor and measure resistance across sensor terminals with known ambient temperature; compare to expected thermistor resistance chart if available.
Check for shorts/opens: With ignition off, check continuity from sensor connector to climate control module and for shorts to chassis ground or battery +12V.
Swap or substitute: If available and identical, swap with another known-good cabin temp sensor to confirm sensor vs module/wiring issue.
Module checks: If wiring and sensor test OK, inspect climate control/module grounds and inputs; consider module bench test or replacement per manufacturer's procedure.
Clear codes & retest: After repair, clear DTCs and verify proper operation and that the code does not return during a road or system test.

Likely causes

Broken or chafed wiring harness to left rear foot sensor
Connector pins pushed out, corroded or contaminated
Sensor element out of specification due to age or moisture
Poor ground at sensor or module
Aftermarket work or recent maintenance disturbed the duct/sensor

Fault status

⚠️ Status

B13EC — Left rear foot air duct temperature sensor circuit: open/short/implausible signal detected.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-1.5 hours

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B13EC — Left rear - Foot - air duct temperature sensor