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Home / DTC / P0168 — Fuel Temperature Too High

P0168 — Fuel Temperature Too High

Detailed page for trouble code P0168.

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22,491specific
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P0168

Generic P — Powertrain

Fuel Temperature Too High

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

Causes

  • Failed or out-of-spec fuel temperature sensor (thermistor)
  • Short or high voltage on sensor signal/wiring
  • Corroded, loose or damaged connector
  • Actual fuel overheating (heat soak, hot fuel return, or fuel heater malfunction)
  • PCM/ECM internal fault or software issue

Symptoms

  • MIL/Check Engine Light illuminated
  • Stored freeze-frame data shows high fuel temperature
  • Hard starting, especially after hot soak
  • Reduced fuel system performance or limp-home strategy (vehicle-dependent)
  • Poor fuel economy or rough idle in some cases

What to check

  • Read freeze-frame and live data for fuel temperature and related sensors (ECT, ambient air temp)
  • Compare fuel temperature reading with ambient and coolant temperatures
  • Visually inspect fuel temp sensor, connector and wiring for damage or corrosion
  • Backprobe sensor connector to measure signal voltage and reference ground
  • Check for TSBs or software updates for PCM relating to fuel temperature sensing

Signal parameters

  • Typical fuel temperature sensor output: about 0.2–4.8 V depending on temperature and sensor type (verify with vehicle-specific data)
  • Sensor is usually a thermistor (resistance changes with temperature); expect resistance to change predictably with temperature (consult service manual for values)
  • No rapid voltage spikes; signal should be steady or change smoothly with temperature
  • Reference circuit and sensor supply voltage present (usually key-on 5 V reference or ground reference depending on design)

Diagnostic algorithm

  1. Retrieve freeze-frame, freeze parameters and all stored codes. Note vehicle conditions when fault set (engine temp, ambient, fuel pressure).
  2. Use a scan tool to monitor fuel temperature PID against coolant and ambient temperatures. Confirm reading is abnormally high or erratic.
  3. Visually inspect sensor and harness for heat damage, kinks, rubbing, pin corrosion, or evidence of fuel leakage at the sensor.
  4. With key ON engine OFF, backprobe the sensor connector: verify reference voltage (if applicable), signal voltage and ground continuity to PCM. Compare to expected ranges in service data.
  5. Measure sensor resistance at known fuel temperatures (remove sensor if necessary) and compare to manufacturer resistance vs temperature chart.
  6. Wiggle harness with live data to look for intermittent changes. Inspect/repair any shorts to battery voltage or abnormal resistance to ground.
  7. If wiring and sensor check good, inspect fuel routing for heat soak (proximity to exhaust, turbo, or coolant lines) and check for stuck fuel heater elements if fitted.
  8. If wiring and sensor verified OK, consider ECM input test or reflash/replace ECM as last resort following manufacturer procedures.
  9. After repairs, clear codes and perform a test drive to confirm code does not return and readings normalize under operating conditions.

Likely causes

  • Open or shorted sensor element causing elevated voltage
  • Pinched wiring or frayed harness shorted to battery voltage
  • Connector corrosion or poor pin contact
  • Fuel lines routed too close to heat sources or returning hot fuel from system
  • Faulty ECM input stage (less common)

Fault status

⚠️ Status
Fuel Temperature Too High — PCM detected fuel temperature signal above expected range. MIL on; freeze-frame data stored. Inspect sensor, wiring, and actual fuel temperature before replacing control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P0168

LAND ROVER P — Powertrain

The engine fuel temperature is too high

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

Causes

  • Failed or out-of-spec fuel temperature sensor (thermistor)
  • Short or high voltage on sensor signal/wiring
  • Corroded, loose or damaged connector
  • Actual fuel overheating (heat soak, hot fuel return, or fuel heater malfunction)
  • PCM/ECM internal fault or software issue

Symptoms

  • MIL/Check Engine Light illuminated
  • Stored freeze-frame data shows high fuel temperature
  • Hard starting, especially after hot soak
  • Reduced fuel system performance or limp-home strategy (vehicle-dependent)
  • Poor fuel economy or rough idle in some cases

What to check

  • Read freeze-frame and live data for fuel temperature and related sensors (ECT, ambient air temp)
  • Compare fuel temperature reading with ambient and coolant temperatures
  • Visually inspect fuel temp sensor, connector and wiring for damage or corrosion
  • Backprobe sensor connector to measure signal voltage and reference ground
  • Check for TSBs or software updates for PCM relating to fuel temperature sensing

Signal parameters

  • Typical fuel temperature sensor output: about 0.2–4.8 V depending on temperature and sensor type (verify with vehicle-specific data)
  • Sensor is usually a thermistor (resistance changes with temperature); expect resistance to change predictably with temperature (consult service manual for values)
  • No rapid voltage spikes; signal should be steady or change smoothly with temperature
  • Reference circuit and sensor supply voltage present (usually key-on 5 V reference or ground reference depending on design)

Diagnostic algorithm

  1. Retrieve freeze-frame, freeze parameters and all stored codes. Note vehicle conditions when fault set (engine temp, ambient, fuel pressure).
  2. Use a scan tool to monitor fuel temperature PID against coolant and ambient temperatures. Confirm reading is abnormally high or erratic.
  3. Visually inspect sensor and harness for heat damage, kinks, rubbing, pin corrosion, or evidence of fuel leakage at the sensor.
  4. With key ON engine OFF, backprobe the sensor connector: verify reference voltage (if applicable), signal voltage and ground continuity to PCM. Compare to expected ranges in service data.
  5. Measure sensor resistance at known fuel temperatures (remove sensor if necessary) and compare to manufacturer resistance vs temperature chart.
  6. Wiggle harness with live data to look for intermittent changes. Inspect/repair any shorts to battery voltage or abnormal resistance to ground.
  7. If wiring and sensor check good, inspect fuel routing for heat soak (proximity to exhaust, turbo, or coolant lines) and check for stuck fuel heater elements if fitted.
  8. If wiring and sensor verified OK, consider ECM input test or reflash/replace ECM as last resort following manufacturer procedures.
  9. After repairs, clear codes and perform a test drive to confirm code does not return and readings normalize under operating conditions.

Likely causes

  • Open or shorted sensor element causing elevated voltage
  • Pinched wiring or frayed harness shorted to battery voltage
  • Connector corrosion or poor pin contact
  • Fuel lines routed too close to heat sources or returning hot fuel from system
  • Faulty ECM input stage (less common)

Fault status

⚠️ Status
Fuel Temperature Too High — PCM detected fuel temperature signal above expected range. MIL on; freeze-frame data stored. Inspect sensor, wiring, and actual fuel temperature before replacing control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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P0167 P0118 P0188 P0190 P0191
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