OBD-II code · Powertrain (generic, extended)
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.
Is it safe to drive with P2557?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyStuck float
- PossibleTrapped air around the sensor
- Less likelySensor element aged beyond calibration window
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Coolant Level Sensor, Cooling System
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.