P0184Fuel Temperature Sensor A Circuit Intermittent
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- Fuel temperature sensor A is an NTC thermistor: the hotter the fuel, the lower its resistance and signal voltage. On diesels it sits in the injection pump, rail or return line; on Ford petrol direct-injection engines it is built into the rail pressure sensor, and GM uses digital rail temperature sensors on its direct-injection engines. P0184 covers jumps in the signal: fuel cannot heat up or cool down that fast, so a sudden change points to a loose contact. GM diesels check every new value against an exponentially filtered window around the last good value and set the code when 10 of 15 samples (100 ms each) fall outside; two trips, blocked while a circuit fault is active. GM still writes 'Circuit Intermittent' in 2016 and 2018 – a change to 'Intermittent/Erratic' is not documented. No source was found for petrol engines.
- What you may notice
- Check engine light on
- Fuel temperature in scan data jumps
- Usually no change in driving
- Likely causes
- LikelyLoose contact or weak terminal tension in the connector
- LikelyWire break or chafing from vibration
- PossibleSensor with internal dropouts
- PossibleCorrosion from moisture
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €30 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.