What Does P0180 Mean?
The fuel temperature sensor A circuit has a general malfunction. The ECM is not receiving a valid signal from the fuel temperature sensor, which is used to compensate fuel injection calculations for fuel density changes with temperature. This sensor is commonly found on diesel vehicles and flex-fuel gasoline vehicles. Without a valid reading, the ECM may use a default fuel temperature, leading to slightly inaccurate fueling.
Common Causes
35%
Failed fuel temperature sensor (open or shorted internally)
30%
Damaged, corroded, or disconnected sensor wiring or connector
15%
Blown fuse or open circuit in the sensor power supply
10%
Poor ground connection in the sensor circuit
10%
ECM input fault or damaged pin at the ECM connector
Diagnostic Steps
1
Monitor fuel temperature sensor A reading in live data. A valid reading should approximate ambient temperature on a cold start and rise during operation. A reading of -40°F or 300°F+ indicates an open or short circuit.
2
Locate the fuel temperature sensor (typically on the fuel rail, fuel line, or integrated into the fuel composition sensor) and inspect the connector for corrosion, fuel contamination, or physical damage.
3
Disconnect the sensor and measure its resistance with an ohmmeter. Most fuel temp sensors are NTC thermistors — resistance should be approximately 2,000–3,000 ohms at 68°F (20°C). Compare to manufacturer specifications.
4
Check for reference voltage and ground at the sensor connector with the sensor unplugged (key on). Typical reference voltage is 5V.
5
If resistance and wiring both check good, monitor the ECM input with a voltmeter at the ECM connector pin while heating the sensor with a heat gun to verify the ECM is reading the signal correctly.
Estimated Repair Cost
$75 - $300
Parts + labor, varies by vehicle and location
The fuel temperature sensor A circuit has a general malfunction. The ECM is not receiving a valid signal from the fuel temperature sensor, which is used to compensate fuel injection calculations for fuel density changes with temperature. This sensor is commonly found on diesel vehicles and flex-fuel...
The most common cause of P0180 (Fuel Temperature Sensor A Circuit Malfunction) is: Failed fuel temperature sensor (open or shorted internally)
Typical repair costs for P0180 range from $75 to $300, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving. The ECM will use a default fuel temperature value, resulting in slightly inaccurate fuel delivery. You may notice marginally worse fuel economy or slightly rough running in extreme temperatures, but there is no safety risk.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0180 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System
Difficulty
Type
Generic (SAE)
Recommended Tools
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