However, excessive use or wear and tear can cause converter issues like shuddering, slippage, or even contaminate the transmission with debris. Usually, a torque converter acts as a link between the engine and the transmission. The automatic transmission system houses the torque converter. This means any valve body issue can affect the functioning of the transmission system - ultimately triggering the transmission light on your dashboard. In fact, modern valve bodies even have a transmission control module (TCM) that controls all sensors and electronics. Now, the valve body has many passages within them to send transmission fluid to other parts. Most traditional automatic transmissions and continuously variable transmission systems (CVT) come with a valve body. Some vehicles with automatic transmissions have a shift interlock system where you need to press the brake first to shift out of ‘park.’ Your check transmission light may pop up if this system malfunctions. Sometimes, the transmission light may not indicate a transmission problem but can be a reflection of powertrain system failure. When any of those components fail, your powertrain control module may read it as a transmission failure and turn on the transmission warning light. Internal Transmission FailureĪn automatic transmission system comes with many complex internal components. To confirm a transmission fluid leak, you can check for a dark or bright red puddle under your vehicle. So if your automatic transmission fluid is low, it can indicate a transmission fluid leak. Transmission fluid doesn’t burn like engine oil. To prevent this, the transmission light may turn up as soon as your transmission fluid level drops. The transmission may not work properly when your transmission fluid level is low, ultimately leading to a bad transmission and possibly severe internal damage. You should immediately stop driving and let your transmission cool down before you get a mechanic to check it out. No matter the cause, an overheated transmission should be treated like an overheated engine. Here are a few reasons why your vehicles transmission could heat up: To prevent overheating, ensure your cooling components, like the thermostat and radiator, are working properly - and can maintain optimal transmission fluid temperature. Transmission overheating is the most common reason for a transmission light to come on. Here are a few other transmission problems that might trigger this warning light: 1. The transmission light can show up due to problems like a simple electrical malfunction, low transmission fluid level, or difficulty shifting gears. 7 Key Causes For A Lit Transmission Warning Light So why does a transmission light turn on? Also, manual transmission cars don’t have a transmission warning light. NOTE: Your vehicle may be forced into a fail-safe or limp mode when the transmission dashboard warning light turns on. An illuminated check engine light is an early indicator of transmission and other related problems. The check engine light may also pop on, along with the transmission warning light. Certain vehicles may have a simple text string alerting you of an issue, while others may not even have a transmission light. It’s a visible light with a distinct symbol, so you’ll be hard-pressed to miss it - a gearwheel encircling a thermometer or exclamation point is pretty common. How your transmission light looks depends on your vehicle’s make and model.
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