Powertrain
generic / SAE
P2185
Engine Coolant Temperature Sensor 2 Circuit High
The second coolant temperature sensor (often radiator-outlet or cylinder-head bank) reports a voltage above the upper threshold — typically an open signal wire or a sensor with infinite resistance.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number1 / 85
Possible causes
- Sensor element open high
- Signal wire open medium
- Connector pins corroded - high contact resistance low
Symptoms
- Check engine light on
- Cooling fan runs constantly or not at all
- Cabin heater weak or excessively hot
- Possible long warm-up time or hard cold start
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 40–200 €
- Estimated time: 0.3–1 h
- Component: coolant temperature sensor 2
- Component: sensor wiring
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012