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Home / DTC / P0180 — Fuel temperature sensor

P0180 — Fuel temperature sensor

Detailed page for trouble code P0180.

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Code

P0180

MITSUBISHI P — Powertrain

Fuel temperature sensor

Brand: MITSUBISHI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in fuel temperature sensor wiring
  • Corroded or loose connector at sensor or ECM
  • Failed fuel temperature sensor (thermistor)
  • Poor sensor ground or reference voltage fault
  • Contamination or fuel-soaked connector in fuel filter/rail assembly
  • ECM input circuit fault (less common)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Incorrect fuel trim control — possible rough idle or drivability issues
  • Hard starting or longer cranking under extreme temperatures
  • Reduced fuel economy or increased emissions
  • Fuel temperature reading on scan tool erratic, fixed or out-of-range

What to check

  • Read freeze frame and live data for fuel temperature and compare to ambient/coolant temp
  • Scan tool: monitor fuel temp sensor voltage and fuel trims while key ON and engine running
  • Visually inspect sensor location (fuel rail/filter) and connector for corrosion or damage
  • Backprobe sensor harness: check reference voltage (usually 5V), signal voltage and ground continuity
  • Measure sensor resistance off-vehicle at known temperatures (consult service data if available)
  • Wiggle test harness while monitoring live data to detect intermittent wiring faults

Signal parameters

  • Sensor type: typically a thermistor (NTC) — resistance decreases as fuel temperature rises
  • Expected signal voltage range to ECM: approximately 0.1 V to 4.9 V depending on temperature and sensor design
  • Expected operating fuel temperature range: roughly -40°C to +120°C (in-service usually -20°C to +80°C)
  • ECM reference: stable 5V reference (verify present) and good ground
  • Normal behavior: monotonic change in voltage/resistance with temperature; no sudden jumps or fixed values

Diagnostic algorithm

  1. Retrieve and record freeze frame and trouble code details with a scan tool. Note fuel temp value and related codes.
  2. Visually inspect sensor, connector and wiring for damage, corrosion or fuel contamination. Repair or clean as needed.
  3. With ignition ON, monitor sensor signal and reference voltage at the harness connector using a multimeter/scan tool. Confirm 5V reference (if applicable) and stable ground.
  4. If signal is fixed (stuck high/low) or absent, disconnect sensor and measure resistance of the sensor at ambient temperature. Compare to service specification or expect resistance to change if warmed/cooled.
  5. Perform continuity and short-to-ground/power checks on harness between sensor connector and ECM connector. Repair any open/shorts.
  6. If wiring and connector are good but sensor resistance/voltage out of expected behavior, replace the fuel temperature sensor.
  7. After repair, clear codes, perform key cycles and road test. Re-scan to confirm code did not return and fuel temp reported is plausible across conditions.
  8. Safety note: when accessing in-line fuel components, relieve fuel system pressure and follow safe procedures for working around fuel and electrical circuits.

Likely causes

  • Damaged wiring harness between sensor and ECU (abraded, pinched, rodent damage)
  • Connector pins corroded, bent or not seated (water/fuel intrusion)
  • Sensor element failed due to age or fuel contamination
  • Connector ground or reference (5V) wire open or shorted
  • Sensor installed incorrectly or wrong replacement part

Fault status

⚠️ Status
Fuel Temperature Sensor Circuit Malfunction — ECM detects out-of-range, open or shorted fuel temperature signal.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0181 P0118 P0112 P0191 P0193
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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