P0185Fuel Temperature Sensor B Circuit
- 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 B 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. Sensor B is the second measuring point, for example GM's 6.6 litre diesel sensor 2 or a second rail. P0185 is the general circuit fault of this sensor, the counterpart of P0180. None of the manufacturers checked uses it; GM reports sensor 2 faults as P0187/P0188. No manufacturer document using exactly this code was found; the description rests on CARB's circuit monitoring requirement and component information.
- What you may notice
- Check engine light on
- Substitute value, usually no change in driving
- Likely causes
- LikelyWire or connector open or corroded
- LikelySensor faulty
- RareControl module reference or ground
- 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: €50 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.