P2185 code meaning
Engine Coolant Temperature Sensor 2 Circuit High
Powertrain system Generic code P21xx codes Check engine light
What P2185 means
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.
P2185 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2185
- Check engine light
- Fans run permanently as a safety measure
- Low coolant or temperature warning without a real cause on some models
Common causes of P2185
- Most likelyConnector at sensor 2 unplugged, loose or corroded
- PossibleSignal or ground wire of sensor 2 broken
- PossibleSensor element interrupted
- Less likelySignal wire shorted to a voltage source
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Engine coolant temperature sensor 2Sensor wiring
What each part of P2185 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 1 | Area: fuel and air metering. |
| 85 | The exact fault in that area. |
What to do next
- Note P2185 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2185
What does P2185 mean?
P2185 means "Engine Coolant Temperature Sensor 2 Circuit High". P2185 is the high end of the sensor 2 circuit check. It is a generic code, so it means the same on every make.
Is it safe to drive with P2185?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2185 fail an emissions test?
Yes, it can. P2185 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2185 to fix?
Difficulty: easy. A typical repair takes 0.3 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2185 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.