Fuel and air

P0180 — Fuel Temperature Sensor A Circuit Malfunction

Severity: low Safe to drive

What P0180 means

The engine control module constantly reads the voltage from fuel temperature sensor A to determine how warm the fuel is. When that voltage falls outside the possible range, such as from an open circuit or a short to ground or power, it sets P0180. Fuel temperature is used to fine-tune fueling because fuel density changes with temperature.

Symptoms

  • Check Engine Light on
  • Hard starting, especially when cold but sometimes when hot
  • Rough idle
  • Slightly worse fuel economy
  • Possible hesitation or reduced performance

Possible causes

  1. Failed fuel temperature sensor or integrated fuel composition sensor
  2. Open, shorted, or damaged wiring or connector in the sensor circuit
  3. Corroded terminals or a poor ground reference
  4. Damaged wiring in the in-tank fuel pump module
  5. Moisture or fuel intrusion in the sensor connector
  6. Rarely, an internal ECM/PCM fault

How to diagnose

  1. Scan for codes and review freeze frame data, noting any other codes
  2. Clear the code and see whether it returns immediately or intermittently
  3. Compare the live fuel temperature reading with actual conditions; on a cold-soaked engine it should be near ambient temperature
  4. Inspect the sensor connector and fuel pump module connector for corrosion, moisture, or fuel contamination
  5. Check for about 5 V reference and a good ground at the sensor connector with a multimeter
  6. Measure sensor resistance and compare to the manufacturer's temperature chart
  7. Test the harness to the ECM for opens and shorts
  8. If all checks pass, evaluate the ECM and look for software updates

Common fixes

  • Replace the fuel temperature sensor, or the fuel pump module if the sensor is built in
  • Repair damaged wiring or replace the connector
  • Clean terminals and restore the ground connection
  • Reprogram or replace the ECM (rare)

P0180 on different brands

Ford · manuals
Ford uses a P0180:16 format meaning low input (circuit voltage below threshold); it describes the monitor condition detected, not a confirmed failed part.

Questions and answers

Can I drive with a P0180 code?

Usually yes, as it rarely threatens the engine. However, hard starts and poorer fuel economy are possible, so don't put off diagnosis for long.

What most often causes P0180?

Most often it is the fuel temperature sensor itself or damaged wiring or a connector, including those at the fuel pump module. Start with a visual check of the connector and harness.

Will clearing the code fix it?

Clearing it with a scan tool only turns off the light temporarily. If the underlying fault remains, the code will come back.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.