P0184 OBD-II Trouble Code: Fuel Temperature Sensor "A" Circuit Intermittent

P0184 trouble code definition

Fuel Temperature Sensor "A" Circuit Intermittent

What the P0184 code means

P0184 is a generic OBD-II code indicating that the fuel temperature sensor A is intermittent; either the sensor input is not steady and goes in and out of operation limits, or the fuel temperature in the fuel tank or fuel rail is erratic beyond specified limits.

What causes the P0184 code?

• The engine control module (ECM) detects that the sensor circuit is malfunctioning if the sensor input is not steady, as designed for the sensor.

• Corroded connector to the sensor

What are the symptoms of the P0184 code?

• The engine will run normally if the sensor is intermittent, unless the fuel is contaminated.

• Excessive additives in the fuel can cause erratic sensor readings and cause the fuel to boil off at lower temperatures or freeze too early.

• The ECM sets code P0184 to memory and turns on the Check Engine Light.

How does a mechanic diagnose the P0184 code?

• Scans codes and documents the freeze frame data, then clears the codes to verify code returns

• Does a visual check of all the wiring and connections to the sensor, checking for breaks in the wiring or loose connections

• Disconnects connection to the sensor and checks to see if the sensor is testing within specifications while tapping lightly on the sensor

Common mistakes when diagnosing the P0184 code

Follow these simple guidelines to prevent misdiagnosis:

• Do a visual check of connections to the sensor to make sure they are making good contact to the fuel temperature sensor.

• Check the fuel for excessive additives that can cause sensors to become erratic.

How serious is the P0184 code?

• Drivability symptoms could result from erratic input from the fuel temperature sensor due to extremely hot or extremely cold fuel temperature.

• The engine may misfire, hesitate and stall if the fuel temperature exceeds normal operating temperatures due to temperature sensor circuit malfunction, or if the fuel rail gets too hot or too cold.

What repairs can fix the P0184 code?

• Testing the fuel temperature sensor and replacing it if it is out of specifications
• Repairing or replacing a defective connector or wiring to the sensor
• Replacing the diesel fuel heater assembly with the temperature sensor

Additional comments for consideration regarding the P0184 code

The code P0184 is used on diesel engines with fuel heaters and on gasoline engines to monitor the fuel temperature in the fuel tank or at the fuel rail. Follow the manufacturer's recommended testing procedures for the vehicle and type of fuel you are working on.

Need help with a P0184 code?

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