Faulty fuel temperature sensor giving an out-of-range or stuck reading; Damaged, chafed or corroded wiring to the sensor, including open circuit or short to earth or supply; Corroded, loose or contaminated sensor connector terminals; Fuel leak or fuel contamination at the sensor affecting the connector or reading; Fault in the sensor supply or earth reference shared with other sensors; Faulty engine control unit input circuit.

P0180

Fuel Temperature Sensor A Circuit.

Generic
Powertrain
Generic code
Low severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
1: AreaFuel and air metering
80: FaultThe specific fault in that area

What it means

P0180 means the engine control unit has detected a fault in the Fuel Temperature Sensor A circuit. The sensor is a thermistor whose resistance changes with fuel temperature, and the control unit watches its signal voltage. The code sets when that signal is outside the expected range or does not make sense, which points to the sensor, its wiring or its connector. Where the sensor is fitted and how the fuel temperature is used varies by model and engine.

Symptoms

Engine warning light on
Hard or extended starting, particularly when hot or cold
Rough idle or slight hesitation under load
Poor fuel economy
Reduced power in some cases
No noticeable symptoms at all

Possible causes

Faulty fuel temperature sensor giving an out-of-range or stuck readinglikely
Damaged, chafed or corroded wiring to the sensor, including open circuit or short to earth or supplylikely
Corroded, loose or contaminated sensor connector terminalslikely
Fuel leak or fuel contamination at the sensor affecting the connector or readingpossible
Fault in the sensor supply or earth reference shared with other sensorspossible
Faulty engine control unit input circuitrare

How to diagnose

Read all stored and pending codes and note the freeze frame data, then check for other sensor circuit codes that suggest a shared supply or earth fault.
Check live data for fuel temperature and compare it with the intake air and coolant temperature on a cold engine; they should be similar.
Look for a reading that is fixed at an extreme, such as very low or very high, which indicates an open or shorted circuit.
Inspect the sensor, connector and wiring for chafing, heat damage, corrosion, fuel contamination and poor pin tension.
With the ignition off and the connector unplugged, measure the sensor resistance and compare it with the manufacturer's figures at the current temperature.
Check the reference voltage and earth at the harness connector, then test the signal wire for continuity and for shorts to earth or supply.
Wiggle the harness and connector with the engine running while watching live data for dropouts.
Consult model-specific information for the sensor location, as it may be in the fuel rail, filter housing or pump module and may need fuel system depressurisation.

How to fix

Replace the fuel temperature sensor if its resistance or signal is out of specification.
Repair or replace damaged wiring, ensuring proper insulation and routing away from heat and sharp edges.
Clean or replace corroded connector terminals and refit the connector securely.
Fix any fuel leak at the sensor and replace contaminated seals or connectors.
Restore a faulty shared supply or earth fault found during testing.
If all wiring and the sensor test fine, have the control unit input circuit tested and repaired or replaced as per manufacturer procedure.

Can I keep driving?

Low severity

The car can normally be driven while you book it in, as the control unit usually uses a default fuel temperature value. If starting becomes difficult, or the car runs poorly, have it checked sooner.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.