Code
P0181
Generic
P — Powertrain
Fuel Temperature Sensor A Circuit Range/Performance
Views:
UK: 36
EN: 55
RU: 74
AI status
Completed
Completed
100%
Causes
- Open or short in sensor wiring (open to Vb, short to ground or battery)
- Corroded, loose or contaminated connector at sensor or ECM
- Failed fuel temperature sensor (thermistor element)
- Poor sensor ground or reference voltage loss
- Fuel contamination or internal sensor damage (fuel-swollen insulation)
- Intermittent wiring/harness damage (chafing, heat, pinched)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Incorrect fuel temperature reading on scan tool (out-of-range or erratic)
- Hard start or rich/lean running at certain temperatures
- Reduced fuel economy or increased emissions
- Possible rough idle or driveability complaints under some conditions
What to check
- Read and record freeze-frame and live data for fuel temperature with a scan tool
- Inspect sensor connector and wiring for corrosion, damage, or loose pins
- Back-probe sensor connector and verify reference voltage (if applicable) and ground
- Measure sensor output voltage and/or resistance at ambient temperature
- Perform wiggle test on wiring while monitoring live data for intermittent faults
- Check continuity between sensor and ECM pins; check for shorts to ground or battery
Signal parameters
- Sensor type: typically an NTC thermistor (resistance decreases as fuel temperature rises)
- Common output: analog 0–5 V signal to ECM (exact range depends on vehicle/ECM)
- Typical behavior: smooth, monotonic change in voltage/resistance with temperature
- Example (varies by manufacturer): resistance falls as temp increases; nominal mid-range resistance often in the kilohm range at ~20°C — consult OEM chart for exact values
- An open circuit usually shows voltage pegged high or low (depending on wiring) or infinite resistance
- A short to ground or to battery will drive the voltage toward 0 V or battery voltage respectively
Diagnostic algorithm
- Retrieve DTC(s) and freeze frame data with a scan tool. Note when the code set and operating conditions.
- Visually inspect the fuel temperature sensor and harness for damage, fuel saturation, corrosion, missing seals or loose connector pins.
- With ignition ON (engine off), back-probe connector and verify sensor reference voltage (often 5 V - check manual) and a good ground. Record voltages.
- With harness still connected, monitor live fuel temperature sensor voltage while warming or cooling the sensor (warm with hand or heat gun briefly; cool with canned air/ice) and look for smooth, proportional response.
- If output suspicious, remove sensor and measure resistance across sensor terminals at known temperatures (ambient, iced water). Compare to OEM resistance vs temperature chart.
- If resistance/out-of-range, replace sensor. If resistance is OK but voltage issues persist, inspect wiring: check continuity to ECM and for shorts to ground/battery. Repair wiring or connector as needed.
- After repair, clear codes and perform a test drive/operational cycle to confirm the fault does not return and that fuel temperature reading behaves correctly.
- If wiring and sensor check good and problem persists, consider ECM input circuit fault and consult OEM procedures.
Likely causes
- Connector corrosion or poor pin contact at sensor
- Broken wire or intermittent connection between sensor and ECM
- Failed sensor element (most common hardware failure)
- Short to ground or short to battery voltage in harness
- Fuel contamination or mechanical damage to sensor
Fault status
Status
Fuel Temperature Sensor A circuit reading out of range or poor performance detected by ECM; MIL set. Check sensor, connector, wiring and ECM input.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P0181
GWM
P — Powertrain
- Invalid indicator / not adjusted fuel temperature sensor A
Views:
UK: 18
EN: 26
RU: 29
AI status
Completed
Completed
100%
Causes
- Open or short in sensor wiring (open to Vb, short to ground or battery)
- Corroded, loose or contaminated connector at sensor or ECM
- Failed fuel temperature sensor (thermistor element)
- Poor sensor ground or reference voltage loss
- Fuel contamination or internal sensor damage (fuel-swollen insulation)
- Intermittent wiring/harness damage (chafing, heat, pinched)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Incorrect fuel temperature reading on scan tool (out-of-range or erratic)
- Hard start or rich/lean running at certain temperatures
- Reduced fuel economy or increased emissions
- Possible rough idle or driveability complaints under some conditions
What to check
- Read and record freeze-frame and live data for fuel temperature with a scan tool
- Inspect sensor connector and wiring for corrosion, damage, or loose pins
- Back-probe sensor connector and verify reference voltage (if applicable) and ground
- Measure sensor output voltage and/or resistance at ambient temperature
- Perform wiggle test on wiring while monitoring live data for intermittent faults
- Check continuity between sensor and ECM pins; check for shorts to ground or battery
Signal parameters
- Sensor type: typically an NTC thermistor (resistance decreases as fuel temperature rises)
- Common output: analog 0–5 V signal to ECM (exact range depends on vehicle/ECM)
- Typical behavior: smooth, monotonic change in voltage/resistance with temperature
- Example (varies by manufacturer): resistance falls as temp increases; nominal mid-range resistance often in the kilohm range at ~20°C — consult OEM chart for exact values
- An open circuit usually shows voltage pegged high or low (depending on wiring) or infinite resistance
- A short to ground or to battery will drive the voltage toward 0 V or battery voltage respectively
Diagnostic algorithm
- Retrieve DTC(s) and freeze frame data with a scan tool. Note when the code set and operating conditions.
- Visually inspect the fuel temperature sensor and harness for damage, fuel saturation, corrosion, missing seals or loose connector pins.
- With ignition ON (engine off), back-probe connector and verify sensor reference voltage (often 5 V - check manual) and a good ground. Record voltages.
- With harness still connected, monitor live fuel temperature sensor voltage while warming or cooling the sensor (warm with hand or heat gun briefly; cool with canned air/ice) and look for smooth, proportional response.
- If output suspicious, remove sensor and measure resistance across sensor terminals at known temperatures (ambient, iced water). Compare to OEM resistance vs temperature chart.
- If resistance/out-of-range, replace sensor. If resistance is OK but voltage issues persist, inspect wiring: check continuity to ECM and for shorts to ground/battery. Repair wiring or connector as needed.
- After repair, clear codes and perform a test drive/operational cycle to confirm the fault does not return and that fuel temperature reading behaves correctly.
- If wiring and sensor check good and problem persists, consider ECM input circuit fault and consult OEM procedures.
Likely causes
- Connector corrosion or poor pin contact at sensor
- Broken wire or intermittent connection between sensor and ECM
- Failed sensor element (most common hardware failure)
- Short to ground or short to battery voltage in harness
- Fuel contamination or mechanical damage to sensor
Fault status
Status
Fuel Temperature Sensor A circuit reading out of range or poor performance detected by ECM; MIL set. Check sensor, connector, wiring and ECM input.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P0181
HUMMER
P — Powertrain
Fuel Temp. Sensor 1 Circuit Performance
Views:
UK: 24
EN: 104
RU: 48
AI status
Completed
Completed
100%
Causes
- Open or short in sensor wiring (open to Vb, short to ground or battery)
- Corroded, loose or contaminated connector at sensor or ECM
- Failed fuel temperature sensor (thermistor element)
- Poor sensor ground or reference voltage loss
- Fuel contamination or internal sensor damage (fuel-swollen insulation)
- Intermittent wiring/harness damage (chafing, heat, pinched)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Incorrect fuel temperature reading on scan tool (out-of-range or erratic)
- Hard start or rich/lean running at certain temperatures
- Reduced fuel economy or increased emissions
- Possible rough idle or driveability complaints under some conditions
What to check
- Read and record freeze-frame and live data for fuel temperature with a scan tool
- Inspect sensor connector and wiring for corrosion, damage, or loose pins
- Back-probe sensor connector and verify reference voltage (if applicable) and ground
- Measure sensor output voltage and/or resistance at ambient temperature
- Perform wiggle test on wiring while monitoring live data for intermittent faults
- Check continuity between sensor and ECM pins; check for shorts to ground or battery
Signal parameters
- Sensor type: typically an NTC thermistor (resistance decreases as fuel temperature rises)
- Common output: analog 0–5 V signal to ECM (exact range depends on vehicle/ECM)
- Typical behavior: smooth, monotonic change in voltage/resistance with temperature
- Example (varies by manufacturer): resistance falls as temp increases; nominal mid-range resistance often in the kilohm range at ~20°C — consult OEM chart for exact values
- An open circuit usually shows voltage pegged high or low (depending on wiring) or infinite resistance
- A short to ground or to battery will drive the voltage toward 0 V or battery voltage respectively
Diagnostic algorithm
- Retrieve DTC(s) and freeze frame data with a scan tool. Note when the code set and operating conditions.
- Visually inspect the fuel temperature sensor and harness for damage, fuel saturation, corrosion, missing seals or loose connector pins.
- With ignition ON (engine off), back-probe connector and verify sensor reference voltage (often 5 V - check manual) and a good ground. Record voltages.
- With harness still connected, monitor live fuel temperature sensor voltage while warming or cooling the sensor (warm with hand or heat gun briefly; cool with canned air/ice) and look for smooth, proportional response.
- If output suspicious, remove sensor and measure resistance across sensor terminals at known temperatures (ambient, iced water). Compare to OEM resistance vs temperature chart.
- If resistance/out-of-range, replace sensor. If resistance is OK but voltage issues persist, inspect wiring: check continuity to ECM and for shorts to ground/battery. Repair wiring or connector as needed.
- After repair, clear codes and perform a test drive/operational cycle to confirm the fault does not return and that fuel temperature reading behaves correctly.
- If wiring and sensor check good and problem persists, consider ECM input circuit fault and consult OEM procedures.
Likely causes
- Connector corrosion or poor pin contact at sensor
- Broken wire or intermittent connection between sensor and ECM
- Failed sensor element (most common hardware failure)
- Short to ground or short to battery voltage in harness
- Fuel contamination or mechanical damage to sensor
Fault status
Status
Fuel Temperature Sensor A circuit reading out of range or poor performance detected by ECM; MIL set. Check sensor, connector, wiring and ECM input.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for HUMMER
138
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Code
P0181
MITSUBISHI
P — Powertrain
Fuel temperature sensor range
Views:
UK: 23
EN: 35
RU: 51
AI status
Completed
Completed
100%
Causes
- Open or short in sensor wiring (open to Vb, short to ground or battery)
- Corroded, loose or contaminated connector at sensor or ECM
- Failed fuel temperature sensor (thermistor element)
- Poor sensor ground or reference voltage loss
- Fuel contamination or internal sensor damage (fuel-swollen insulation)
- Intermittent wiring/harness damage (chafing, heat, pinched)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Incorrect fuel temperature reading on scan tool (out-of-range or erratic)
- Hard start or rich/lean running at certain temperatures
- Reduced fuel economy or increased emissions
- Possible rough idle or driveability complaints under some conditions
What to check
- Read and record freeze-frame and live data for fuel temperature with a scan tool
- Inspect sensor connector and wiring for corrosion, damage, or loose pins
- Back-probe sensor connector and verify reference voltage (if applicable) and ground
- Measure sensor output voltage and/or resistance at ambient temperature
- Perform wiggle test on wiring while monitoring live data for intermittent faults
- Check continuity between sensor and ECM pins; check for shorts to ground or battery
Signal parameters
- Sensor type: typically an NTC thermistor (resistance decreases as fuel temperature rises)
- Common output: analog 0–5 V signal to ECM (exact range depends on vehicle/ECM)
- Typical behavior: smooth, monotonic change in voltage/resistance with temperature
- Example (varies by manufacturer): resistance falls as temp increases; nominal mid-range resistance often in the kilohm range at ~20°C — consult OEM chart for exact values
- An open circuit usually shows voltage pegged high or low (depending on wiring) or infinite resistance
- A short to ground or to battery will drive the voltage toward 0 V or battery voltage respectively
Diagnostic algorithm
- Retrieve DTC(s) and freeze frame data with a scan tool. Note when the code set and operating conditions.
- Visually inspect the fuel temperature sensor and harness for damage, fuel saturation, corrosion, missing seals or loose connector pins.
- With ignition ON (engine off), back-probe connector and verify sensor reference voltage (often 5 V - check manual) and a good ground. Record voltages.
- With harness still connected, monitor live fuel temperature sensor voltage while warming or cooling the sensor (warm with hand or heat gun briefly; cool with canned air/ice) and look for smooth, proportional response.
- If output suspicious, remove sensor and measure resistance across sensor terminals at known temperatures (ambient, iced water). Compare to OEM resistance vs temperature chart.
- If resistance/out-of-range, replace sensor. If resistance is OK but voltage issues persist, inspect wiring: check continuity to ECM and for shorts to ground/battery. Repair wiring or connector as needed.
- After repair, clear codes and perform a test drive/operational cycle to confirm the fault does not return and that fuel temperature reading behaves correctly.
- If wiring and sensor check good and problem persists, consider ECM input circuit fault and consult OEM procedures.
Likely causes
- Connector corrosion or poor pin contact at sensor
- Broken wire or intermittent connection between sensor and ECM
- Failed sensor element (most common hardware failure)
- Short to ground or short to battery voltage in harness
- Fuel contamination or mechanical damage to sensor
Fault status
Status
Fuel Temperature Sensor A circuit reading out of range or poor performance detected by ECM; MIL set. Check sensor, connector, wiring and ECM input.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for MITSUBISHI
406
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- Platinum Edition
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- SE, AWD
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- SEL, AWD
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- SEL, FWD
- SEL Black Edition, AWD
- SEL Black Edition, AWD
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- SEL Black Edition, FWD
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- SE Special Edition, AWD
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- SE Special Edition, FWD
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-
MITSUBISHI: 2022
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Eclipse Cross
- ES, AWD
- ES, AWD
- ES, FWD
- ES, FWD
- LE, AWD
- LE, AWD
- LE, FWD
- LE, FWD
- SE, AWD
- SE, AWD
- SE, FWD
- SE, FWD
- SEL, AWD
- SEL, AWD
- SEL, FWD
- SEL, FWD
- SEL Special Edition, AWD
- SEL Special Edition, AWD
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- SEL Special Edition, FWD
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- SE Special Edition, AWD
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- SE Special Edition, FWD
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-
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