P2559 Fault Code

Engine Coolant Level Sensor/Switch Circuit High

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2559 fault code indicates an issue with the engine coolant level sensor or switch, specifically a high circuit voltage reading. This sensor plays a critical role in monitoring the coolant level in the engine, which is essential for maintaining optimal operating temperatures and preventing engine overheating.

• The coolant level sensor is typically located in the coolant reservoir.
• A high voltage signal can suggest electrical faults, such as short circuits or sensor malfunctions.
• Proper function of the sensor ensures that the engine can operate efficiently and prevents potential damage due to overheating.

What are the symptoms of the P2559 code?

Drivers may experience the following symptoms when the P2559 code is triggered:

• Warning lights illuminated on the dashboard, specifically the coolant level warning light.
• The engine may overheat if the issue is not addressed, leading to potential engine damage.
• Abnormal engine performance due to incorrect coolant level readings being sent to the ECM.

What causes the P2559 code?

Several factors can lead to the P2559 fault code:

• A faulty engine coolant level sensor that is providing incorrect readings.
• Broken or frayed wiring that may be causing a short circuit and relaying a false high voltage to the engine control module (ECM).
• Corrosion at the electrical connectors can interrupt signals and lead to an erroneous high reading.
• Low coolant levels or leaks that may not be directly related to the sensor but can affect its operation.

How to fix P2559?

To resolve the P2559 fault code, follow these steps:

• Inspect the coolant level sensor for any visible damages, replace it if necessary.
• Check the wiring and connectors for signs of wear, corrosion, or damage. Repair or replace as needed to ensure a secure connection.
• Verify that the coolant level is adequate; add coolant if it is low to prevent further issues.
• Clear the fault code and monitor the vehicle to see if the code reappears following repairs.