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.
Affected components
- Coolant temperature sensor 2
- Sensor wiring
Common causes
- High likelihood: Sensor element open
- Medium likelihood: Signal wire open
- 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.