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Home / DTC / B1250 — Interior air temperature sensor circuit

B1250 — Interior air temperature sensor circuit

Detailed page for trouble code B1250.

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B1250

ALFA ROMEO B — Body

Interior air temperature sensor circuit

Brand: ALFA ROMEO
Type: B — Body
Views: UK: 4 EN: 7 RU: 7
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed interior/cabin air temperature sensor (NTC thermistor)
  • Open or shorted wiring between sensor and climate control module
  • Corroded, loose or damaged connector at sensor or module
  • Poor ground or loss of reference voltage to sensor circuit
  • Water ingress or physical damage to sensor assembly
  • Faulty climate control module (rare) or software issue

Symptoms

  • Incorrect cabin temperature reading on HVAC display or instrument cluster
  • Automatic climate control running too warm or too cold or cycling on/off
  • HVAC takes longer than normal to stabilize cabin temperature
  • Reduced AC/heater performance or unexpected blower behavior
  • Fault stored in climate control module; possible dash message or service indicator

What to check

  • Retrieve stored DTC(s) and freeze-frame data with a diagnostic scanner; record live interior temp PID
  • Visual inspection of sensor location (usually in dash/evaporator area) and harness for damage, contamination or water
  • Inspect and reseat sensor connector pins for corrosion, bent pins or pushed-out terminals
  • Check for proper reference voltage and ground at the sensor connector with key ON (follow manual)
  • Measure sensor resistance/voltage and verify it changes when sensor is warmed/cooled (hand/ice pack)
  • Perform a wiggle test on harness with scanner connected to observe intermittent faults

Signal parameters

  • Sensor type: typically an NTC thermistor (resistance decreases as temperature rises)
  • Normal signal: variable analog voltage or resistance reported to climate module (varies with temp)
  • Open-circuit: sensor will show very high resistance or no voltage change; module may report circuit open
  • Short-circuit: sensor line pulled to ground or battery will show near 0 V or full voltage respectively
  • Expected operating signal range typically within the module's stated voltage span (commonly ~0.5–4.5 V); consult vehicle wiring manual for exact values

Diagnostic algorithm

  1. Read and record all related DTCs, clear codes, then attempt to re-create to confirm repeatability.
  2. With ignition ON (engine off), monitor live interior air temperature PID while performing tests.
  3. Visually inspect the sensor and wiring (dash area/evaporator housing) for damage, water or contamination; repair obvious issues.
  4. Unplug sensor connector and inspect pins; clean or repair terminals as needed.
  5. Measure sensor resistance across its terminals and verify it changes when warmed/cooled. Note: NTC resistance should decrease with increasing temperature.
  6. Backprobe the sensor connector and verify reference voltage and ground presence at the connector with key ON; compare to factory specs.
  7. If voltages at sensor are correct but signal is incorrect, check continuity from sensor connector to climate control module connector and inspect for shorts to ground/power.
  8. If wiring and connector are good but sensor readings are out of range, replace the interior air temperature sensor and retest.
  9. If new sensor does not correct the issue, suspect damaged wiring near harness, intermittent connector fault, or climate control module fault; consider module diagnostics or replacement per workshop manual.
  10. After repair, clear codes and confirm proper operation and stable PID values during a test drive or extended HVAC run.

Likely causes

  • Damaged or disconnected sensor connector at dash/evaporator housing
  • Broken or chafed wiring harness causing open or short to ground/power
  • Corrosion/contamination at terminals producing high resistance/erratic signal
  • Failed thermistor element inside the sensor
  • Intermittent wiring fault or poor ground at module

Fault status

⚠️ Status
Interior air temperature sensor circuit - open, short or implausible/erratic signal detected by climate control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1251 B1252 B1253 B1254 P0112 P0113
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Code

B1250

FIAT B — Body

Interior air temperature sensor circuit

Brand: FIAT
Type: B — Body
Views: UK: 3 EN: 5 RU: 5
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed interior/cabin air temperature sensor (NTC thermistor)
  • Open or shorted wiring between sensor and climate control module
  • Corroded, loose or damaged connector at sensor or module
  • Poor ground or loss of reference voltage to sensor circuit
  • Water ingress or physical damage to sensor assembly
  • Faulty climate control module (rare) or software issue

Symptoms

  • Incorrect cabin temperature reading on HVAC display or instrument cluster
  • Automatic climate control running too warm or too cold or cycling on/off
  • HVAC takes longer than normal to stabilize cabin temperature
  • Reduced AC/heater performance or unexpected blower behavior
  • Fault stored in climate control module; possible dash message or service indicator

What to check

  • Retrieve stored DTC(s) and freeze-frame data with a diagnostic scanner; record live interior temp PID
  • Visual inspection of sensor location (usually in dash/evaporator area) and harness for damage, contamination or water
  • Inspect and reseat sensor connector pins for corrosion, bent pins or pushed-out terminals
  • Check for proper reference voltage and ground at the sensor connector with key ON (follow manual)
  • Measure sensor resistance/voltage and verify it changes when sensor is warmed/cooled (hand/ice pack)
  • Perform a wiggle test on harness with scanner connected to observe intermittent faults

Signal parameters

  • Sensor type: typically an NTC thermistor (resistance decreases as temperature rises)
  • Normal signal: variable analog voltage or resistance reported to climate module (varies with temp)
  • Open-circuit: sensor will show very high resistance or no voltage change; module may report circuit open
  • Short-circuit: sensor line pulled to ground or battery will show near 0 V or full voltage respectively
  • Expected operating signal range typically within the module's stated voltage span (commonly ~0.5–4.5 V); consult vehicle wiring manual for exact values

Diagnostic algorithm

  1. Read and record all related DTCs, clear codes, then attempt to re-create to confirm repeatability.
  2. With ignition ON (engine off), monitor live interior air temperature PID while performing tests.
  3. Visually inspect the sensor and wiring (dash area/evaporator housing) for damage, water or contamination; repair obvious issues.
  4. Unplug sensor connector and inspect pins; clean or repair terminals as needed.
  5. Measure sensor resistance across its terminals and verify it changes when warmed/cooled. Note: NTC resistance should decrease with increasing temperature.
  6. Backprobe the sensor connector and verify reference voltage and ground presence at the connector with key ON; compare to factory specs.
  7. If voltages at sensor are correct but signal is incorrect, check continuity from sensor connector to climate control module connector and inspect for shorts to ground/power.
  8. If wiring and connector are good but sensor readings are out of range, replace the interior air temperature sensor and retest.
  9. If new sensor does not correct the issue, suspect damaged wiring near harness, intermittent connector fault, or climate control module fault; consider module diagnostics or replacement per workshop manual.
  10. After repair, clear codes and confirm proper operation and stable PID values during a test drive or extended HVAC run.

Likely causes

  • Damaged or disconnected sensor connector at dash/evaporator housing
  • Broken or chafed wiring harness causing open or short to ground/power
  • Corrosion/contamination at terminals producing high resistance/erratic signal
  • Failed thermistor element inside the sensor
  • Intermittent wiring fault or poor ground at module

Fault status

⚠️ Status
Interior air temperature sensor circuit - open, short or implausible/erratic signal detected by climate control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1251 B1252 B1253 B1254 P0112 P0113
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Code

B1250

LAND ROVER B — Body

Car temperature sensor circuit failure

Brand: LAND ROVER
Type: B — Body
Views: UK: 5 EN: 9 RU: 9
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed interior/cabin air temperature sensor (NTC thermistor)
  • Open or shorted wiring between sensor and climate control module
  • Corroded, loose or damaged connector at sensor or module
  • Poor ground or loss of reference voltage to sensor circuit
  • Water ingress or physical damage to sensor assembly
  • Faulty climate control module (rare) or software issue

Symptoms

  • Incorrect cabin temperature reading on HVAC display or instrument cluster
  • Automatic climate control running too warm or too cold or cycling on/off
  • HVAC takes longer than normal to stabilize cabin temperature
  • Reduced AC/heater performance or unexpected blower behavior
  • Fault stored in climate control module; possible dash message or service indicator

What to check

  • Retrieve stored DTC(s) and freeze-frame data with a diagnostic scanner; record live interior temp PID
  • Visual inspection of sensor location (usually in dash/evaporator area) and harness for damage, contamination or water
  • Inspect and reseat sensor connector pins for corrosion, bent pins or pushed-out terminals
  • Check for proper reference voltage and ground at the sensor connector with key ON (follow manual)
  • Measure sensor resistance/voltage and verify it changes when sensor is warmed/cooled (hand/ice pack)
  • Perform a wiggle test on harness with scanner connected to observe intermittent faults

Signal parameters

  • Sensor type: typically an NTC thermistor (resistance decreases as temperature rises)
  • Normal signal: variable analog voltage or resistance reported to climate module (varies with temp)
  • Open-circuit: sensor will show very high resistance or no voltage change; module may report circuit open
  • Short-circuit: sensor line pulled to ground or battery will show near 0 V or full voltage respectively
  • Expected operating signal range typically within the module's stated voltage span (commonly ~0.5–4.5 V); consult vehicle wiring manual for exact values

Diagnostic algorithm

  1. Read and record all related DTCs, clear codes, then attempt to re-create to confirm repeatability.
  2. With ignition ON (engine off), monitor live interior air temperature PID while performing tests.
  3. Visually inspect the sensor and wiring (dash area/evaporator housing) for damage, water or contamination; repair obvious issues.
  4. Unplug sensor connector and inspect pins; clean or repair terminals as needed.
  5. Measure sensor resistance across its terminals and verify it changes when warmed/cooled. Note: NTC resistance should decrease with increasing temperature.
  6. Backprobe the sensor connector and verify reference voltage and ground presence at the connector with key ON; compare to factory specs.
  7. If voltages at sensor are correct but signal is incorrect, check continuity from sensor connector to climate control module connector and inspect for shorts to ground/power.
  8. If wiring and connector are good but sensor readings are out of range, replace the interior air temperature sensor and retest.
  9. If new sensor does not correct the issue, suspect damaged wiring near harness, intermittent connector fault, or climate control module fault; consider module diagnostics or replacement per workshop manual.
  10. After repair, clear codes and confirm proper operation and stable PID values during a test drive or extended HVAC run.

Likely causes

  • Damaged or disconnected sensor connector at dash/evaporator housing
  • Broken or chafed wiring harness causing open or short to ground/power
  • Corrosion/contamination at terminals producing high resistance/erratic signal
  • Failed thermistor element inside the sensor
  • Intermittent wiring fault or poor ground at module

Fault status

⚠️ Status
Interior air temperature sensor circuit - open, short or implausible/erratic signal detected by climate control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1251 B1252 B1253 B1254 P0112 P0113
Workshop Manuals

Repair manuals for 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
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  • 05 ENGINE TUNING DATA
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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:
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Download
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Code

B1250

Other B — Body

Air Temperature Internal Sensor Circuit Failure

Brand: Other
Type: B — Body
Views: UK: 19 EN: 40 RU: 21
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed interior/cabin air temperature sensor (NTC thermistor)
  • Open or shorted wiring between sensor and climate control module
  • Corroded, loose or damaged connector at sensor or module
  • Poor ground or loss of reference voltage to sensor circuit
  • Water ingress or physical damage to sensor assembly
  • Faulty climate control module (rare) or software issue

Symptoms

  • Incorrect cabin temperature reading on HVAC display or instrument cluster
  • Automatic climate control running too warm or too cold or cycling on/off
  • HVAC takes longer than normal to stabilize cabin temperature
  • Reduced AC/heater performance or unexpected blower behavior
  • Fault stored in climate control module; possible dash message or service indicator

What to check

  • Retrieve stored DTC(s) and freeze-frame data with a diagnostic scanner; record live interior temp PID
  • Visual inspection of sensor location (usually in dash/evaporator area) and harness for damage, contamination or water
  • Inspect and reseat sensor connector pins for corrosion, bent pins or pushed-out terminals
  • Check for proper reference voltage and ground at the sensor connector with key ON (follow manual)
  • Measure sensor resistance/voltage and verify it changes when sensor is warmed/cooled (hand/ice pack)
  • Perform a wiggle test on harness with scanner connected to observe intermittent faults

Signal parameters

  • Sensor type: typically an NTC thermistor (resistance decreases as temperature rises)
  • Normal signal: variable analog voltage or resistance reported to climate module (varies with temp)
  • Open-circuit: sensor will show very high resistance or no voltage change; module may report circuit open
  • Short-circuit: sensor line pulled to ground or battery will show near 0 V or full voltage respectively
  • Expected operating signal range typically within the module's stated voltage span (commonly ~0.5–4.5 V); consult vehicle wiring manual for exact values

Diagnostic algorithm

  1. Read and record all related DTCs, clear codes, then attempt to re-create to confirm repeatability.
  2. With ignition ON (engine off), monitor live interior air temperature PID while performing tests.
  3. Visually inspect the sensor and wiring (dash area/evaporator housing) for damage, water or contamination; repair obvious issues.
  4. Unplug sensor connector and inspect pins; clean or repair terminals as needed.
  5. Measure sensor resistance across its terminals and verify it changes when warmed/cooled. Note: NTC resistance should decrease with increasing temperature.
  6. Backprobe the sensor connector and verify reference voltage and ground presence at the connector with key ON; compare to factory specs.
  7. If voltages at sensor are correct but signal is incorrect, check continuity from sensor connector to climate control module connector and inspect for shorts to ground/power.
  8. If wiring and connector are good but sensor readings are out of range, replace the interior air temperature sensor and retest.
  9. If new sensor does not correct the issue, suspect damaged wiring near harness, intermittent connector fault, or climate control module fault; consider module diagnostics or replacement per workshop manual.
  10. After repair, clear codes and confirm proper operation and stable PID values during a test drive or extended HVAC run.

Likely causes

  • Damaged or disconnected sensor connector at dash/evaporator housing
  • Broken or chafed wiring harness causing open or short to ground/power
  • Corrosion/contamination at terminals producing high resistance/erratic signal
  • Failed thermistor element inside the sensor
  • Intermittent wiring fault or poor ground at module

Fault status

⚠️ Status
Interior air temperature sensor circuit - open, short or implausible/erratic signal detected by climate control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1251 B1252 B1253 B1254 P0112 P0113
Workshop Manuals

Available brands with manuals

2
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Workshop Manual
Years: 2008 Manual in English Pages: 187 4.9 MB
Short description

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Contents
Key sections:
  • 00 - Technical data
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Workshop Manual
Years: 2001 Manual in English Pages: 34 851.0 KB
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Short description

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Key sections:
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  • 2.1 Rules for cleanliness
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Workshop Manual
Years: 2008–2019 Manual in English Pages: 128 11.1 MB
Short description

Service manual for the 7‑Speed dual‑clutch (DSG) transmissions 0CJ/0CL/0CK/0DN/0DP/0HL fitted to various Audi models. Includes repair information, clutch and gearbox disassembly/assembly, mechatronic and hydraulic system procedures, seals and differential work. Edition 05.2018.

Contents
Key sections:
  • 00 - General, Technical Data
  • 1 Repair Information
  • 1.1 General Repair Information
  • 1.2 Contact Corrosion
  • 1.3 ATF Pump, Deactivating and Draining the Hydraulic Pump Reservoir
  • 2 Rules for Cleanliness when Working on DSG® Transmission
  • 30 - Clutch
  • 1 Clutch
  • 1.1 Overview - Flywheel and Dual Clutch
  • 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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