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Home / DTC / B1008 — Rear inside TEMP. sensor open

B1008 — Rear inside TEMP. sensor open

Detailed page for trouble code B1008.

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Code

B1008

MITSUBISHI B — Body

Rear inside TEMP. sensor open

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

Causes

  • Disconnected or loose sensor connector
  • Broken or chafed wiring (open circuit) between sensor and control module
  • Corroded or bent connector pins
  • Failed temperature sensor (open internally)
  • Water intrusion or contamination at sensor/connector
  • Poor previous repair or pinched harness

Symptoms

  • HVAC displays incorrect or missing rear/cabin temperature reading
  • Automatic climate control may not regulate rear zone properly
  • DTC B1008 stored and may trigger a warning or service indicator
  • Inconsistent temperature behavior for rear vents or zone
  • Possible related HVAC fault codes

What to check

  • Read and record stored DTCs and freeze-frame data with a scan tool
  • Visually inspect the rear inside temp sensor, connector, and wiring for damage, corrosion, or water
  • Verify the connector is fully seated and pins are straight and secure
  • Wiggle harness while observing live sensor data or DTC response
  • Measure sensor resistance at the sensor (with harness disconnected) and compare to spec
  • Backprobe the sensor connector with ignition ON to check reference voltage and signal voltage

Signal parameters

  • Open-circuit condition: infinite resistance (OL) measured across sensor leads
  • Typical NTC-type interior sensor examples (manufacturer specs required): ~10 kΩ at 25°C (varies by design)
  • Expected signal voltage (backprobe with ignition ON) typically in the range 0.2–4.8 V depending on temperature and circuit design; open often results in a fixed 'no signal' or extreme voltage
  • Short to ground: ~0 Ω; short to battery: ~0 V at signal or constant voltage depending on wiring

Diagnostic algorithm

  1. Connect a diagnostic scanner, confirm B1008 is present, and note any additional HVAC or temperature sensor codes.
  2. Obtain the vehicle-specific wiring diagram and pinouts for the rear inside temperature sensor and HVAC/control module.
  3. Visually inspect sensor location, connector, and harness for damage, corrosion, or water intrusion; repair obvious issues and retest.
  4. With ignition OFF, disconnect the sensor connector and inspect pins for corrosion, damage, or pushed-out terminals; clean or repair as needed.
  5. Measure sensor resistance at the sensor terminals (harness disconnected). If resistance is infinite/OL, replace the sensor; if resistance is within expected range, continue.
  6. With ignition ON (engine off), backprobe the harness connector and measure signal and reference voltages; compare to specification. No reference or signal may indicate open circuit or module problem.
  7. Check continuity between the sensor connector and the HVAC/control module pin; repair any open circuit in the wiring harness.
  8. Inspect for short to battery or ground on the signal/reference wires and repair as required.
  9. After repairs or replacement, clear codes, cycle ignition, and verify the sensor reports plausible values on the scanner and that B1008 does not return after test driving or cycling HVAC.
  10. If wiring and sensor check good but code persists, suspect HVAC/control module input fault and follow advanced module testing procedures per service manual.

Likely causes

  • Connector unplugged or poor contact at the rear inside temp sensor
  • Open wire in harness due to chafe, flexing, or terminal pull-out
  • Failed sensor element producing infinite resistance (open)
  • Corrosion or water-damaged connector causing open circuit
  • Less likely: HVAC or body control module input fault

Fault status

⚠️ Status
Rear inside temperature sensor circuit — open detected. No valid temperature signal to HVAC/control module.
🟢 Repair difficulty: Easy
⏱️ Diagnostic time: 0.5-1.5 hours

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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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