Fuel Temperature Sensor A Circuit Intermittent
The P0184 code indicates that the Engine Control Module (ECM) has detected an intermittent or erratic signal from the fuel temperature sensor 'A' circuit. This sensor monitors the temperature of the fuel in the fuel rail or tank, and the ECM uses this data to adjust fuel delivery and timing. An intermittent fault can cause drivability issues and may be triggered by wiring problems, connector corrosion, or a failing sensor.
01. Most Common Causes
- Faulty fuel temperature sensor
- Damaged or corroded wiring/connectors in the sensor circuit
- Intermittent short or open in the sensor circuit
- Poor electrical connection at the sensor or ECM
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Hard starting, especially when hot or cold
- Poor fuel economy
- Rough idle or hesitation during acceleration
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for other related codes.
Step 2: Visually inspect the fuel temperature sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's resistance and voltage output with a multimeter and compare to manufacturer specifications.
Step 4: Check for intermittent issues by wiggling the wiring harness while monitoring the sensor signal with a scan tool.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally not recommended to drive for extended periods with this code, as it can cause poor engine performance and reduced fuel economy. However, if the vehicle runs normally, short trips may be acceptable. Have it diagnosed promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the cause. A sensor replacement is usually around $80-$120, while wiring repairs may be less.