Powertrain
generic / SAE
P2557
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / 57
Possible causes
- Stuck float high
- Trapped air around the sensor medium
- Sensor element aged beyond calibration window low
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 40–250 €
- Estimated time: 0.3–1.5 h
- Component: coolant level sensor
- Component: cooling system
- MIL / check engine light
Sources
References
sae:J2012