Fuel Temperature Sensor A Circuit Intermittent
The P0184 code indicates that the Engine Control Module (ECM) has detected an intermittent signal from the fuel temperature sensor 'A' circuit. This sensor monitors the temperature of the fuel in the fuel rail or tank, and its signal is used for fuel mixture and timing adjustments. An intermittent fault means the signal is erratic or drops out temporarily, often due to wiring issues, poor connections, or a failing sensor.
1. Most Common Causes
- Loose or corroded connections at the fuel temperature sensor connector
- Cut, chafed, or heat-damaged wiring in the sensor harness
- Intermittent internal failure of the fuel temperature sensor
- Bent, oxidized, or poorly contacting terminals in the connector
- Electromagnetic interference affecting the sensor circuit
- Poor ground in the sensor circuit
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Hard starting, especially in cold weather
- Poor fuel economy
- Rough idle or hesitation during acceleration
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P0184 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 resistance with a multimeter and compare to manufacturer specifications; replace if out of range.
Step 4: Check for intermittent shorts or opens by wiggling the wiring harness while monitoring sensor signal with a scan tool.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short trips, but the vehicle may experience drivability issues like rough idle or poor fuel economy. Prolonged driving could lead to more serious problems, so it's best to diagnose and repair promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150, including parts and labor. The sensor itself is usually inexpensive ($20-$50), and labor is minimal if it's easily accessible.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.