Engine Coolant Level Sensor/Switch Circuit Range/Performance

Where it lives

For P2557, the part to look at first is the sensor named here.

Check these first

• An engine coolant level sensor reading outside its expected range
• High resistance in the engine coolant level sensor circuit
• A failing engine coolant level sensor
• Debris or scale in the coolant affecting the reading

What to do next

1. Check the coolant level in the reservoir
2. Read the engine coolant level sensor on a scan tool
3. Compare the sensor reading to the actual coolant level
4. Test the engine coolant level sensor circuit for added resistance
5. Replace the engine coolant level sensor if the circuit tests good
6. Clear the code and retest

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