What Does P0184 Mean?
The fuel temperature sensor A circuit is exhibiting intermittent behavior. The ECM has detected the sensor signal is dropping in and out, spiking, or fluctuating erratically in a way that does not correspond to actual fuel temperature changes. This is typically caused by a loose connection, damaged wire, or a sensor that is beginning to fail internally. The driver may notice intermittent check engine light illumination and the ECM may periodically switch between the sensor reading and a default value.
Common Causes
35%
Loose or corroded fuel temperature sensor connector with intermittent contact
30%
Chafed or damaged wiring with intermittent open or short
20%
Fuel temperature sensor with an internal intermittent fault (cracked element)
10%
Sensor mounting issue allowing vibration-induced signal loss
5%
ECM connector pin with intermittent contact on the sensor input
Diagnostic Steps
1
Monitor fuel temperature sensor reading in live data over several minutes. Look for sudden spikes, dropouts to -40°F, or erratic jumps that do not correlate with actual temperature changes.
2
Perform a wiggle test — gently move the sensor connector, wiring harness, and ECM connector while watching the live data. Any disturbance in the reading pinpoints the intermittent connection.
3
Inspect the sensor connector for backed-out pins, spread terminals, corrosion, or fuel contamination. Check that the connector lock is fully engaged.
4
Trace the wiring harness from the sensor to the ECM, looking for areas of chafing against brackets, heat damage from exhaust proximity, or pinch points where the harness passes through body panels.
5
If the connector and wiring appear sound, measure sensor resistance while tapping the sensor body with a screwdriver handle. Intermittent jumps in resistance confirm an internal sensor fault.
Estimated Repair Cost
$75 - $300
Parts + labor, varies by vehicle and location
The fuel temperature sensor A circuit is exhibiting intermittent behavior. The ECM has detected the sensor signal is dropping in and out, spiking, or fluctuating erratically in a way that does not correspond to actual fuel temperature changes. This is typically caused by a loose connection, damaged ...
The most common cause of P0184 (Fuel Temperature Sensor A Circuit Intermittent) is: Loose or corroded fuel temperature sensor connector with intermittent contact
Typical repair costs for P0184 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. Intermittent fuel temperature readings cause only minor fuel delivery inaccuracies. The ECM will fall back to a default value when the signal is lost. There are no safety concerns, but the check engine light may cycle on and off.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0184 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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