Powertrain
generic / SAE
P2186
Engine Coolant Temperature Sensor 2 Circuit Low
The second coolant temperature sensor reports a voltage below the lower threshold — typically a short to ground or a sensor with very low resistance.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number1 / 86
Possible causes
- Signal shorted to ground high
- Sensor element shorted 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