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Home / DTC / B1000 — Inside temp.sensor performance

B1000 — Inside temp.sensor performance

Detailed page for trouble code B1000.

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B1000

MITSUBISHI B — Body

Inside temp.sensor performance

Brand: MITSUBISHI
Type: B — Body
AI status
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Page language: EN

Causes

  • Faulty inside/cabin temperature sensor (NTC thermistor or similar)
  • Damaged, corroded or loose connector at sensor or HVAC control unit
  • Wiring open, short to ground or short to voltage in sensor circuit
  • Contamination or water ingress on sensor element
  • Faulty HVAC control module or internal amplifier/ADC
  • Intermittent contact due to vibration or broken wire harness

Symptoms

  • Automatic climate control not maintaining set temperature
  • Cabin temperature reading incorrect or fluctuating on the HVAC display
  • Compressor clutch cycling incorrectly or HVAC stuck in a single mode
  • HVAC system running continuously or not responding to setpoint changes
  • Illumination of HVAC or body control warning lamp, or DTC stored

What to check

  • Read stored DTCs and freeze-frame data with an OEM scanner or compatible scan tool
  • Confirm code B1000 is current or intermittent and whether multiple related codes are present
  • Visually inspect sensor connector and wiring for corrosion, damage, pin push-out, or moisture
  • Check HVAC display sensor temperature value with scanner while changing cabin temperature (compare to actual)
  • Measure sensor resistance and/or voltage at the sensor connector and at the HVAC control module harness (compare to spec)
  • Verify wiring continuity and for shorts to power or ground between sensor and module

Signal parameters

  • Sensor type: typically an NTC thermistor (resistance decreases as temperature rises)
  • Typical resistance behavior (manufacturer-specific): approximate range at 25°C ~2–10 kΩ (confirm service data)
  • Typical signal to HVAC module: analog voltage or resistance reading; expected voltage range ~0.5–4.5 V depending on module (confirm spec)
  • Response: smooth monotonic change with temperature; no sudden jumps or open-circuit (>infinite Ω) or short (

Diagnostic algorithm

  1. Retrieve DTCs and live data. Note whether B1000 is current, pending, or history and check for related codes (e.g., other temp sensors).
  2. Visually inspect inside temperature sensor location (usually in dash or instrument cluster intake) and harness/connector for corrosion, damage or water entry. Repair as needed.
  3. With connector disconnected, measure sensor resistance at ambient cabin temperature and compare to service spec or a typical thermistor curve. If resistance out of expected range, replace sensor.
  4. With ignition ON, backprobe sensor connector and read voltage to ground while observing live data; verify voltage corresponds to ambient temperature and changes smoothly when warmed/cooled (use a hair dryer or canned air).
  5. Check continuity and insulation of wiring between sensor and HVAC control module. Repair any open, high resistance, or shorted wires.
  6. If sensor readings at the module harness differ from sensor connector readings, suspect connector/circuit fault (repair connector/pins).
  7. If wiring and sensor are good but fault persists, test or swap HVAC control module if possible, or consult manufacturer diagnostic flow for module bench tests.
  8. After repair, erase codes, perform function test and road/test to confirm fault does not return.

Likely causes

  • Sensor wiring connector corrosion or loose terminal
  • Open or shorted sensor wiring between sensor and HVAC module
  • Failed temperature sensor element (resistance out of spec)
  • HVAC control module internal fault (less common)

Fault status

⚠️ Status
Inside temperature sensor performance fault detected — sensor signal out of range, intermittent, or implausible. HVAC control may enter fail-safe and cabin temperature control may be affected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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