P2185Engine Coolant Temperature Sensor 2 Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2185 is the high end of the sensor 2 circuit check. With an NTC thermistor a high signal stands for extreme cold, so the usual reason is an open circuit: a broken wire, an unplugged or corroded connector, or a sensor with an interrupted element; a short to voltage is rarer. GM (19OBDG03D) watches for a resistance in the order of 300 kOhm, the value at -60 °C, after 10 s of engine running or above -20 °C intake air, 5 s within 6 s, Type B. VW sets it at below -43 °C on the 2014 CC and above 4.92 V or 4.94 V on the Touareg. Audi issued a 2025 bulletin for the A4 and A5 family on P2185 at the radiator outlet sender G83. In bulletin 21-NA-149 GM traces it to a chafed harness. Low and erratic signals are P2184 and P2186.
- What you may notice
- Check engine light
- Fans run permanently as a safety measure
- Low coolant or temperature warning without a real cause on some models
- Likely causes
- LikelyConnector at sensor 2 unplugged, loose or corroded
- PossibleSignal or ground wire of sensor 2 broken
- PossibleSensor element interrupted
- RareSignal wire shorted to a voltage source
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €30 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.