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Never Ignore Your Trucks Warning Lights!

Updated: Aug 15, 2023

The dashboard lights on your truck are there for a reason. They are diagnostic indicators designed to alert you when something is wrong with your truck. As the owner of the truck, it is your duty to fix the problem right away.


Ignoring your trucks warning lights can cause serious vehicle malfunctions and result in costly repairs. They can also put yourself and others at risk on the roads. Below you will find just a few of the warning lights you should be paying attention to.

Semi truck dashboard warning lights

#1 - ABS (Anti-Lock Brake System) Warning Lights


The ABS warning light is linked to the Automatic Braking System (ABS) in your vehicle. The purpose of the ABS is to prevent the vehicle from locking up or skidding when braking on hard or slippery surfaces, thus allowing the driver to maintain control of the vehicle.


When this light is illuminated, it is a sign of a malfunction in the ABS mechanism, which could be caused by a variety of factors, such as a faulty wheel speed sensor or a malfunctioning control module. If the ABS is not functioning correctly, the wheels may lock during the braking process, resulting in the vehicle skidding and thus posing a serious risk to the driver's safety.


#2 - Brake Fluid Warning Light


The brake fluid warning light may be indicative of a variety of issues that can affect the braking power of a vehicle. If the light is illuminated, it could be indicative of a range of potential issues including:


  • Low break fluid level: This is often the primary cause of the activation of the light. Brake fluid plays a critical role in the operation of the hydraulic braking system. Low levels of brake fluid can significantly reduce braking performance.


  • Brake pad wear: This warning light may also be used in certain vehicles to indicate that the brake pads have become worn and require replacement.


  • Damaged sensor: In some cases, the sensor itself may malfunction, resulting in the appearance of a brake fluid warning light. While this may not have a direct effect on the braking system's performance, it is still essential to address it in order to ensure you are getting proper information regarding the condition of your brakes.


#3 - Check Engine Light


The Check Engine Light is a component of the onboard diagnostic system of a vehicle. It is typically indicated by an engine icon or, in some cases, by the words ‘Check Engine’. When this light is illuminated, it is a general indication that something within the engine or related systems of the vehicle is not functioning as it should. Here are a few possibilities causing this light to come on your dashboard:


  • Faulty oxygen sensor: The oxygen sensor monitors the amount of free oxygen present in the exhaust system of a vehicle. An oxygen sensor that is not functioning properly will not be able to provide the correct information to the engine's computer, resulting in a decrease in engine performance and a decrease in fuel efficiency.


  • Engine misfire: Engine misfires can cause significant damage to your vehicle’s catalytic converter, which is an important and costly part of your exhaust system. Engine misfires can also impact your car’s performance and fuel economy.


  • Emission control system issues: The Check Engine Light may be triggered if there is an issue with emissions control systems, such as a catalytic converter or exhaust recirculation system.


#4 - Engine Temperature Light


The engine temperature light is linked to your vehicle's coolant temperature sensor. The sensor keeps an eye on the engine's temperature, and when it gets too hot – above the safe operating temperature – it sends the engine temperature light to your dashboard.


Overheating can be caused by a variety of factors. It can be the result of a coolant leak, a malfunctioning thermostat, an obstruction in the radiator, a malfunctioning water pump, or a malfunctioning fan belt. In any event, an engine overheating is a serious issue that must be addressed promptly.


#5 - Oil Pressure Light


Oil is an essential part of an internal combustion engine. It lubricates moving parts to help reduce friction and keep them from overheating. But sometimes the oil doesn't circulate at the right pressure, and that's when the Oil Pressure Light comes on. This can be caused by a few different factors:


  • Low oil level: A lack of oil in a vehicle may result in insufficient lubrication of the engine, resulting in a decrease in oil pressure and the appearance of a light on the dashboard.


  • Faulty oil pressure sensor: In some cases, the problem is not related to the oil pressure, but rather to the sensor. When the sensor is not functioning properly, it can cause the Oil Pressure Light to be triggered incorrectly.


  • Engine problems: Low oil pressure can also be caused by more serious problems, such as a faulty oil pump, damaged engine bearings, or extensive engine wear, which can cause the light to turn on.


How Can Curless Truck Repair Help You?


By paying attention to these warning lights from the beginning, you can avoid potentially expensive vehicle damage and safety concerns.


If you are in the Lamar, Missouri area then visit Curless Truck Repair, so that we can identify the issues associated with your illuminated warning lights. We have certified technicians on staff that can quickly identify and resolve issues with great efficiency.


Reach out to us today to see how we can help!






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