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Home / DTC / B1251 — Cabin temperature sensor interrupted

B1251 — Cabin temperature sensor interrupted

Detailed page for trouble code B1251.

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B1251

ALFA ROMEO B — Body

Cabin temperature sensor interrupted

Brand: ALFA ROMEO
Type: B — Body
Views: UK: 2 EN: 12 RU: 3
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open circuit in cabin temperature sensor wiring (broken wire, connector pin out)
  • Disconnected or corroded sensor connector
  • Failed cabin temperature sensor (thermistor)
  • Poor or missing ground or supply to the sensor
  • Water ingress or physical damage to sensor or harness
  • HVAC control module fault or internal connector fault

Symptoms

  • Climate control displays error or incorrect cabin temperature reading
  • Automatic HVAC runs incorrectly or cannot reach set temperature
  • Blower/compressor cycling unexpectedly due to incorrect temp input
  • Heater/AC works in a default/heating-only mode
  • DTC stored in HVAC/control module and may reappear after clearing

What to check

  • Retrieve stored DTCs and relevant freeze-frame/live-data from HVAC module
  • Visually inspect cabin temp sensor location, connector and harness for damage or corrosion
  • Backprobe sensor connector and check supply voltage and ground presence with ignition on
  • Measure sensor resistance at the connector (with sensor disconnected) and compare to expected NTC values
  • Wiggle harness while observing live data or DTC status to detect intermittent opens
  • Inspect for water ingress or signs of rodent/physical damage in HVAC area

Signal parameters

  • Typical cabin temp sensor is an NTC thermistor. Expected resistance at ~25°C commonly ~2–20 kΩ (varies by design).
  • Signal voltage to module often in low-voltage range (approx. 0.2–4.8 V) depending on ambient temperature and vehicle design.
  • Open-circuit will read infinite resistance and typically produce a fixed/high or low voltage at the controller input.
  • Consult vehicle-specific service manual for exact resistance vs temperature table and supply voltage values.

Diagnostic algorithm

  1. Read and record DTC B1251 and any related HVAC/body codes. Note freeze-frame and conditions.
  2. Visually inspect sensor, connector and harness for obvious damage, corrosion, water ingress or disconnection.
  3. With ignition ON (engine off), backprobe the sensor connector: verify there is proper reference supply and ground to the sensor circuit per factory data.
  4. Disconnect the sensor and measure its resistance across terminals at ambient temperature. Compare to specification. If resistance is open/infinite, suspect sensor failure.
  5. If sensor resistance is within spec, measure continuity between sensor connector and HVAC control module connector to confirm no open in harness. Repair any open or high-resistance wiring.
  6. If supply/ground are missing at the sensor connector, trace and repair wiring, fuses or grounds. Check for poor chassis ground connections.
  7. If wiring and supply are good but module input shows no or invalid signal, test the input pin at the HVAC module and verify module harness integrity. Consider module fault if wiring and sensor are good.
  8. After repairs or sensor replacement, clear DTCs and perform operational test: monitor live sensor value while changing cabin temperature or exposure (e.g., warm/cold air) to confirm correct response.
  9. Road/test as required to ensure code does not return and climate control operates normally.

Likely causes

  • Disconnected or loose sensor connector behind dash or in HVAC housing
  • Damaged harness in hinge, under dash or near HVAC intake
  • Failed NTC thermistor sensor
  • Corroded connector pins or poor ground

Fault status

⚠️ Status
Cabin temperature sensor interrupted — open circuit or lost signal to the HVAC control module. The climate control may default to a fallback mode and temperature regulation can be incorrect.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1250 B1252 B1253 P0112 P0113
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Code

B1251

FIAT B — Body

Cabin temperature sensor interrupted

Brand: FIAT
Type: B — Body
Views: UK: 1 EN: 12 RU: 2
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open circuit in cabin temperature sensor wiring (broken wire, connector pin out)
  • Disconnected or corroded sensor connector
  • Failed cabin temperature sensor (thermistor)
  • Poor or missing ground or supply to the sensor
  • Water ingress or physical damage to sensor or harness
  • HVAC control module fault or internal connector fault

Symptoms

  • Climate control displays error or incorrect cabin temperature reading
  • Automatic HVAC runs incorrectly or cannot reach set temperature
  • Blower/compressor cycling unexpectedly due to incorrect temp input
  • Heater/AC works in a default/heating-only mode
  • DTC stored in HVAC/control module and may reappear after clearing

What to check

  • Retrieve stored DTCs and relevant freeze-frame/live-data from HVAC module
  • Visually inspect cabin temp sensor location, connector and harness for damage or corrosion
  • Backprobe sensor connector and check supply voltage and ground presence with ignition on
  • Measure sensor resistance at the connector (with sensor disconnected) and compare to expected NTC values
  • Wiggle harness while observing live data or DTC status to detect intermittent opens
  • Inspect for water ingress or signs of rodent/physical damage in HVAC area

Signal parameters

  • Typical cabin temp sensor is an NTC thermistor. Expected resistance at ~25°C commonly ~2–20 kΩ (varies by design).
  • Signal voltage to module often in low-voltage range (approx. 0.2–4.8 V) depending on ambient temperature and vehicle design.
  • Open-circuit will read infinite resistance and typically produce a fixed/high or low voltage at the controller input.
  • Consult vehicle-specific service manual for exact resistance vs temperature table and supply voltage values.

Diagnostic algorithm

  1. Read and record DTC B1251 and any related HVAC/body codes. Note freeze-frame and conditions.
  2. Visually inspect sensor, connector and harness for obvious damage, corrosion, water ingress or disconnection.
  3. With ignition ON (engine off), backprobe the sensor connector: verify there is proper reference supply and ground to the sensor circuit per factory data.
  4. Disconnect the sensor and measure its resistance across terminals at ambient temperature. Compare to specification. If resistance is open/infinite, suspect sensor failure.
  5. If sensor resistance is within spec, measure continuity between sensor connector and HVAC control module connector to confirm no open in harness. Repair any open or high-resistance wiring.
  6. If supply/ground are missing at the sensor connector, trace and repair wiring, fuses or grounds. Check for poor chassis ground connections.
  7. If wiring and supply are good but module input shows no or invalid signal, test the input pin at the HVAC module and verify module harness integrity. Consider module fault if wiring and sensor are good.
  8. After repairs or sensor replacement, clear DTCs and perform operational test: monitor live sensor value while changing cabin temperature or exposure (e.g., warm/cold air) to confirm correct response.
  9. Road/test as required to ensure code does not return and climate control operates normally.

Likely causes

  • Disconnected or loose sensor connector behind dash or in HVAC housing
  • Damaged harness in hinge, under dash or near HVAC intake
  • Failed NTC thermistor sensor
  • Corroded connector pins or poor ground

Fault status

⚠️ Status
Cabin temperature sensor interrupted — open circuit or lost signal to the HVAC control module. The climate control may default to a fallback mode and temperature regulation can be incorrect.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1250 B1252 B1253 P0112 P0113
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Code

B1251

LAND ROVER B — Body

Temperature sensor in the car - open circuit

Brand: LAND ROVER
Type: B — Body
Views: UK: 4 EN: 19 RU: 4
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open circuit in cabin temperature sensor wiring (broken wire, connector pin out)
  • Disconnected or corroded sensor connector
  • Failed cabin temperature sensor (thermistor)
  • Poor or missing ground or supply to the sensor
  • Water ingress or physical damage to sensor or harness
  • HVAC control module fault or internal connector fault

Symptoms

  • Climate control displays error or incorrect cabin temperature reading
  • Automatic HVAC runs incorrectly or cannot reach set temperature
  • Blower/compressor cycling unexpectedly due to incorrect temp input
  • Heater/AC works in a default/heating-only mode
  • DTC stored in HVAC/control module and may reappear after clearing

What to check

  • Retrieve stored DTCs and relevant freeze-frame/live-data from HVAC module
  • Visually inspect cabin temp sensor location, connector and harness for damage or corrosion
  • Backprobe sensor connector and check supply voltage and ground presence with ignition on
  • Measure sensor resistance at the connector (with sensor disconnected) and compare to expected NTC values
  • Wiggle harness while observing live data or DTC status to detect intermittent opens
  • Inspect for water ingress or signs of rodent/physical damage in HVAC area

Signal parameters

  • Typical cabin temp sensor is an NTC thermistor. Expected resistance at ~25°C commonly ~2–20 kΩ (varies by design).
  • Signal voltage to module often in low-voltage range (approx. 0.2–4.8 V) depending on ambient temperature and vehicle design.
  • Open-circuit will read infinite resistance and typically produce a fixed/high or low voltage at the controller input.
  • Consult vehicle-specific service manual for exact resistance vs temperature table and supply voltage values.

Diagnostic algorithm

  1. Read and record DTC B1251 and any related HVAC/body codes. Note freeze-frame and conditions.
  2. Visually inspect sensor, connector and harness for obvious damage, corrosion, water ingress or disconnection.
  3. With ignition ON (engine off), backprobe the sensor connector: verify there is proper reference supply and ground to the sensor circuit per factory data.
  4. Disconnect the sensor and measure its resistance across terminals at ambient temperature. Compare to specification. If resistance is open/infinite, suspect sensor failure.
  5. If sensor resistance is within spec, measure continuity between sensor connector and HVAC control module connector to confirm no open in harness. Repair any open or high-resistance wiring.
  6. If supply/ground are missing at the sensor connector, trace and repair wiring, fuses or grounds. Check for poor chassis ground connections.
  7. If wiring and supply are good but module input shows no or invalid signal, test the input pin at the HVAC module and verify module harness integrity. Consider module fault if wiring and sensor are good.
  8. After repairs or sensor replacement, clear DTCs and perform operational test: monitor live sensor value while changing cabin temperature or exposure (e.g., warm/cold air) to confirm correct response.
  9. Road/test as required to ensure code does not return and climate control operates normally.

Likely causes

  • Disconnected or loose sensor connector behind dash or in HVAC housing
  • Damaged harness in hinge, under dash or near HVAC intake
  • Failed NTC thermistor sensor
  • Corroded connector pins or poor ground

Fault status

⚠️ Status
Cabin temperature sensor interrupted — open circuit or lost signal to the HVAC control module. The climate control may default to a fallback mode and temperature regulation can be incorrect.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1250 B1252 B1253 P0112 P0113
Workshop Manuals

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Key sections:
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Short description

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Code

B1251

Other B — Body

Air Temperature Internal Sensor Circuit Open

Brand: Other
Type: B — Body
Views: UK: 13 EN: 45 RU: 18
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open circuit in cabin temperature sensor wiring (broken wire, connector pin out)
  • Disconnected or corroded sensor connector
  • Failed cabin temperature sensor (thermistor)
  • Poor or missing ground or supply to the sensor
  • Water ingress or physical damage to sensor or harness
  • HVAC control module fault or internal connector fault

Symptoms

  • Climate control displays error or incorrect cabin temperature reading
  • Automatic HVAC runs incorrectly or cannot reach set temperature
  • Blower/compressor cycling unexpectedly due to incorrect temp input
  • Heater/AC works in a default/heating-only mode
  • DTC stored in HVAC/control module and may reappear after clearing

What to check

  • Retrieve stored DTCs and relevant freeze-frame/live-data from HVAC module
  • Visually inspect cabin temp sensor location, connector and harness for damage or corrosion
  • Backprobe sensor connector and check supply voltage and ground presence with ignition on
  • Measure sensor resistance at the connector (with sensor disconnected) and compare to expected NTC values
  • Wiggle harness while observing live data or DTC status to detect intermittent opens
  • Inspect for water ingress or signs of rodent/physical damage in HVAC area

Signal parameters

  • Typical cabin temp sensor is an NTC thermistor. Expected resistance at ~25°C commonly ~2–20 kΩ (varies by design).
  • Signal voltage to module often in low-voltage range (approx. 0.2–4.8 V) depending on ambient temperature and vehicle design.
  • Open-circuit will read infinite resistance and typically produce a fixed/high or low voltage at the controller input.
  • Consult vehicle-specific service manual for exact resistance vs temperature table and supply voltage values.

Diagnostic algorithm

  1. Read and record DTC B1251 and any related HVAC/body codes. Note freeze-frame and conditions.
  2. Visually inspect sensor, connector and harness for obvious damage, corrosion, water ingress or disconnection.
  3. With ignition ON (engine off), backprobe the sensor connector: verify there is proper reference supply and ground to the sensor circuit per factory data.
  4. Disconnect the sensor and measure its resistance across terminals at ambient temperature. Compare to specification. If resistance is open/infinite, suspect sensor failure.
  5. If sensor resistance is within spec, measure continuity between sensor connector and HVAC control module connector to confirm no open in harness. Repair any open or high-resistance wiring.
  6. If supply/ground are missing at the sensor connector, trace and repair wiring, fuses or grounds. Check for poor chassis ground connections.
  7. If wiring and supply are good but module input shows no or invalid signal, test the input pin at the HVAC module and verify module harness integrity. Consider module fault if wiring and sensor are good.
  8. After repairs or sensor replacement, clear DTCs and perform operational test: monitor live sensor value while changing cabin temperature or exposure (e.g., warm/cold air) to confirm correct response.
  9. Road/test as required to ensure code does not return and climate control operates normally.

Likely causes

  • Disconnected or loose sensor connector behind dash or in HVAC housing
  • Damaged harness in hinge, under dash or near HVAC intake
  • Failed NTC thermistor sensor
  • Corroded connector pins or poor ground

Fault status

⚠️ Status
Cabin temperature sensor interrupted — open circuit or lost signal to the HVAC control module. The climate control may default to a fallback mode and temperature regulation can be incorrect.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1250 B1252 B1253 P0112 P0113
Workshop Manuals

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Contents
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Short description

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Key sections:
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  • 1.2 Flywheel, Removing and Installing
  • 1.3 Dual Clutch, Removing and Installing
  • 1.4 Input Shaft Seal, Replacing
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LAND ROVER 3

Land Rover Defender 300Tdi — Workshop Manual (1996 model year)

Workshop Manual
Defender 300Tdi Years: 1996 Manual in English 7.5 MB
Short description

Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

Contents
Key sections:
  • 01 INTRODUCTION
  • 04 GENERAL SPECIFICATION DATA
  • 05 ENGINE TUNING DATA
  • 07 GENERAL FITTING REMINDERS
  • 09 LUBRICANTS, FLUIDS AND CAPACITIES
  • 10 MAINTENANCE
  • 12 ENGINE Tdi
  • - Description and operation
  • - Fault diagnosis
  • - Adjustment
  • - Repair and overhaul procedures
  • 19 FUEL SYSTEM Tdi
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Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)

Workshop Manual
Defender Years: 1999–2002 Manual in English 7.6 MB
Short description

Workshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.

Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
  • - Fuel handling precautions
  • - Synthetic rubber
  • - Recommended sealants
  • - Used engine oil precautions
  • - Accessories and conversions
  • - Wheels and tyres
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Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)

Workshop Manual
Manual in English Pages: 494 7.1 MB
Short description

Land Rover Range Rover Electrical Library (LRL 0453ENG). Comprehensive manual covering fuse details, earth points, system descriptions, diagnostics and connector pin-outs for electrical troubleshooting and repair. Intended for technicians and service workshops.

Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
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