Engine Coolant Temperature Sensor 2 Circuit Range/Performance
ECT sensor 2 reads in range but plausibility check fails — slow response, stuck reading, or value does not track ECT 1 across a warm-up.
Affected components
- Engine coolant temperature sensor 2
Common causes
- High likelihood: Sensor drifts over service life
- Low likelihood: Sensor element aged beyond calibration window
- Low likelihood: Sensor mounting loose - signal damping
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
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.