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Home / DTC / B1250 — Car temperature sensor circuit failure

B1250 — Car temperature sensor circuit failure

Detailed page for trouble code B1250.

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B1250

LAND ROVER B — Body

Car temperature sensor circuit failure

Brand: LAND ROVER
Type: B — Body
Views: UK: 6 EN: 11 RU: 10
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Page language: EN

Causes

  • Open or short circuit in the temperature sensor wiring
  • Corroded/loose connector or terminal at the sensor or control module
  • Failed temperature sensor (NTC thermistor or similar)
  • Water ingress or physical damage to sensor or harness
  • Poor ground or missing reference voltage to the sensor
  • Faulty HVAC/BCM/comfort control module

Symptoms

  • Incorrect cabin temperature reading or display blank/erratic
  • Automatic climate control not regulating temperature properly
  • HVAC steering to full hot/cold or blower runs incorrectly
  • DTC stored and possible related HVAC warning message
  • No effect after adjusting temperature controls

What to check

  • Read stored freeze frame and fault history with a diagnostic scanner
  • Visually inspect sensor, connector, and harness for damage, corrosion, or water
  • Check relevant fuses and power supply to the HVAC/comfort module
  • Backprobe sensor connector to verify reference voltage and ground
  • Measure sensor resistance at ambient temperature and compare to specification
  • Wiggle test wiring while monitoring live data to reproduce fault

Signal parameters

  • Sensor type: typically NTC thermistor (resistance changes with temperature)
  • Expected reference voltage to sensor: commonly ~5 V (verify vehicle spec)
  • Signal voltage range: typically about 0.5–4.5 V depending on temperature (vehicle-specific)
  • Typical resistance at 25°C: often in the kiloohm range (e.g., 2–20 kΩ) — check manufacturer chart
  • Fault conditions: open circuit (very high resistance or OL) or short to ground/voltage (near 0 Ω or battery voltage)

Diagnostic algorithm

  1. Connect a diagnostic scanner, record B1250 and any other related DTCs, and note freeze frame/live data.
  2. Visually inspect the sensor location and wiring for physical damage, water, or corrosion.
  3. Identify pinout for the temperature sensor and control module from wiring diagrams.
  4. With ignition on, backprobe sensor connector: verify reference voltage, signal voltage, and ground presence.
  5. Remove sensor and measure resistance at ambient temperature. Compare to manufacturer specification or published resistance vs temperature chart.
  6. If resistance is out of spec or open/shorted, replace the sensor and retest.
  7. If sensor resistance is correct, check continuity and insulation of harness between sensor and module; repair any open/shorts/corrosion.
  8. If wiring checks good, check for correct module power/ground and perform module input diagnostics. Reprogram or replace module only after all wiring/sensor checks confirm module fault.
  9. After repairs, clear codes, cycle ignition, and verify fault does not return. Perform functional HVAC test and road or environmental test if needed.

Likely causes

  • Damaged, corroded, or disconnected sensor connector
  • Failed temperature sensor (thermistor out of spec)
  • Short to voltage or ground in the sensor harness
  • Control module input circuit fault (less common)

Fault status

⚠️ Status
Temperature sensor circuit fault detected by comfort/ HVAC control module. Sensor signal out of range, open or shorted.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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B1251 B1252 B1253 B1280 B10A0
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