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.
Affected components
- Coolant temperature sensor 2
- Sensor wiring
Common causes
- High likelihood: Signal shorted to ground
- Medium likelihood: Sensor element shorted
- Low likelihood: Connector pins corroded - high contact resistance
Possible 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
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.