Code
P0180
GWM
P — Powertrain
- Fuel temperature sensor A fault
AI status
Completed
Completed
100%
Causes
- Open, short, or high-resistance wiring in the fuel temperature sensor circuit
- Corroded, loose, or contaminated connector at the sensor or ECM
- Failed fuel temperature sensor (thermistor out of spec)
- Water or contamination in the fuel affecting the sensor
- Faulty ECM or internal reference/noise issue
- Aftermarket parts or incorrect replacement sensor
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Incorrect fuel trim or richer/leaner running than expected
- Hard starting or long cranking in some conditions
- Reduced fuel economy or drivability complaints
- Cold start or warm-up behavior not matching ambient temperature
What to check
- Read freeze frame and live fuel temperature PID with a scan tool
- Verify code is active vs. historical (pending vs. confirmed)
- Visually inspect sensor, connector, and wiring for damage or contamination
- Backprobe sensor connector for reference voltage and signal while monitoring live data
- Measure sensor resistance vs. fuel temperature (and compare to OEM spec)
- Clear codes and reproduce to verify persistence
Signal parameters
- Sensor type: typically an NTC thermistor (resistance falls as temperature rises)
- Signal range (generic): sensor voltage commonly between ~0.1–4.9 V — varies by manufacturer
- Resistance behavior (generic): several hundred ohms to several kilo-ohms across operating range; consult GWM service data for exact resistance/temperature table
- Reference: many systems use an ECM reference (often 5 V) and ground — check for stable reference voltage and ground continuity
Diagnostic algorithm
- Retrieve and record the trouble code and freeze-frame data. Note fuel temperature reading and engine conditions when code set.
- Visually inspect fuel temperature sensor, connector, and wiring for corrosion, fuel contamination, loose pins, or physical damage.
- With ignition ON (engine off), backprobe the sensor connector: verify reference voltage (if used), signal voltage, and good ground. Compare readings to expected ranges and monitor while warming/cooling sensor (by applying heat/cold safely).
- Measure sensor resistance at known temperatures (ambient fuel temp). Compare to OEM resistance vs. temperature chart. If sensor resistance is out of spec, replace sensor.
- Wiggle test wiring and connectors while monitoring signal for intermittent changes. Repair any chafed or broken wires and clean/repair connectors.
- If wiring and sensor check good, inspect ECM connector and grounds. Verify reference voltage is stable and wiring continuity to ECM is intact (check for short to power/ground).
- After repairs, clear codes and perform a road/drive cycle or reproduce conditions to confirm the code does not return.
- If all circuits and sensor test good but code persists, consider ECM fault and follow OEM procedures for module testing/replacement.
Likely causes
- Damaged connector (corrosion or bent pins) at the fuel rail sensor
- Broken or chafed wiring harness (open or short to ground/power)
- Failed fuel temperature sensor due to age/contamination
- Poor ground or lost reference voltage from ECM
Fault status
Status
P0180 — Fuel Temperature Sensor A Circuit Fault. ECM detects open/short/out-of-range signal from fuel temperature sensor; fuel temperature input unreliable.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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