This is because the engine is at risk of being damaged, and the ECM wants to alert the driver to the issue so they can address it. If the engine temperature rises due to low coolant levels, the ECM will detect this and may trigger the check engine light to turn on. When any of these causes occur, it can lead to the check engine light being activated. As a result, the check engine light may illuminate to signal a problem with the engine. Low coolant levels can cause engine damage and affect engine performance, which the ECM constantly monitors. In this instance, it is critical to have the sensor tested to ensure that it is functioning correctly.įinally, some cars don’t have a dedicated coolant light, so the check engine light may warn for low coolant levels. This can lead to false readings and trigger the check engine light to turn on, even if there isn’t a problem with the coolant level. The coolant level sensor can occasionally fail or transmit false signals to the ECM. This temperature rise can cause damage to various components in the engine, so the check engine light may come on to warn you of the issue.Īnother reason low coolant levels can cause the check engine light to turn on is miscommunication. Low coolant level can cause the check engine light to turn on for a few reasons:įirst, if there’s not enough coolant in the system, it can cause the engine to overheat or run at a higher temperature than it should. Reasons Why low coolant levels cause the check engine light It’s always best to stay on top of your coolant level and ensure everything runs smoothly to avoid potential engine damage. Your coolant and engine control systems are closely linked, so if one isn’t working properly, it can affect the other. As a result, it’s critical to keep an eye on your coolant level and rectify any concerns as soon as possible.Ī low coolant level can cause a check engine light to come on. A low coolant level can also lead to reduced performance, decreased fuel efficiency, and increased emissions. The ECM will detect this and may turn on the check engine light to warn you that your engine has a problem. When your coolant level is low, your engine might overheat, which is terrible news for your engine’s components. This information helps the ECM adjust engine performance, timing, and fuel injection. Along with the coolant level sensor, other sensors in the coolant system measure things like temperature and pressure. The coolant system is an essential part of your engine’s overall health, and it’s connected to the engine control system through a network of sensors and actuators. If the coolant level is low, the sensor sends a signal to the ECM, which can trigger the check engine light to come on. Here’s how it works: Your vehicle’s engine control module (ECM) constantly keeps tabs on various systems and sensors, including the coolant level sensor. 4.1 Is there any warning light for low coolant?Ĭan a low coolant level cause a check engine light?Ībsolutely! A low coolant level can cause a check engine light to turn on.2 Reasons Why low coolant levels cause the check engine light.
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