Engine Coolant Level Sensor/Switch Circuit Range/Performance
The coolant level sensor is electrically intact, but the readings are implausible — for example a level that does not move at all over many drive cycles, or jumps that cannot match real coolant loss. Often a stuck float, contaminated electrode or air-locked sensor.
Affected components
- Coolant level sensor
- Cooling system
Common causes
- High likelihood: Stuck float
- Medium likelihood: Trapped air around the sensor
- Low likelihood: Sensor element aged beyond calibration window
Diagnostic notes
- The malfunction indicator lamp may illuminate
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.