P2559

Engine Coolant Level Sensor/Switch Circuit High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$13–50 (est.)

Symptoms

False low coolant warning
Unstable coolant level readings on the dashboard
Check Engine Light Is On
Possible problems with engine warming up

Causes

Coolant level sensor malfunction
Open or short circuit in the sensor circuit
Poor contact in sensor connectors
Sensor contact corrosion
Problems with the engine control unit (rare)

How to Fix

Check the coolant level visually
Inspect the sensor wiring and connectors for damage
Check the sensor resistance with a multimeter
Replace the coolant level sensor if necessary
Clean connector contacts from corrosion

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